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Exhibit 10(b)

CBS CORPORATION
2005 RSU PLAN FOR OUTSIDE DIRECTORS
(as amended and restated through November 1, 2007)

ARTICLE I

GENERAL

Section 1.1 Purpose.

        The purpose of the CBS Corporation 2005 RSU Plan for Outside Directors
(the "Plan") is to benefit and advance the interests of CBS Corporation, a
Delaware corporation (the "Company"), and its subsidiaries by obtaining and
retaining the services of qualified persons who are not employees of the Company
or its subsidiaries to serve as directors and to induce them to make a maximum
contribution to the success of the Company and its subsidiaries.

Section 1.2 Definitions.

        As used in the Plan, the following terms shall have the following
meanings:

        (a)   "Agreement" shall mean the written agreement or certificate or
other documentation governing an Award under the Plan, which shall contain terms
and conditions not inconsistent with the Plan and which shall incorporate the
Plan by reference.

        (b)   "Annual RSU Grant" shall have the meaning set forth in
Section 2.1.

        (c)   "Award" shall mean any Director RSU or Dividend Equivalent.

        (d)   "Board" shall mean the Board of Directors of the Company.

        (e)   "Class B Common Stock" shall mean the shares of Class B Common
Stock, par value $0.001 per share, of the Company.

        (f)    "Code" shall mean the Internal Revenue Code of 1986, as amended,
including any successor law thereto, and the rules and regulations promulgated
thereunder from time to time.

        (g)   "Company" shall have the meaning set forth in Section 1.1.

        (h)   "Director RSUs" shall mean a contractual right granted to a
Participant pursuant to Article II to receive shares of Class B Common Stock,
subject to the terms and conditions set forth in the Plan. Director RSUs shall
be settled

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exclusively in Class B Common Stock. Director RSUs include the Initial RSU
Grants, the Prorated RSU Grants and the Annual RSU Grants.

        (i)    "Dividend Equivalent" shall mean a right to receive a payment
based upon the value of the regular cash dividend paid on a specified number of
shares of Class B Common Stock as set forth in Article III below. Payment in
respect of Dividend Equivalents upon settlement shall be in shares of Class B
Common Stock except as set forth in Article III below.

        (j)    "Effective Date" shall mean the effective date of the Plan
provided for in Article VII below.

        (k)   "Fair Market Value" of a share of Class B Common Stock on a given
date shall be the closing price on such date on the New York Stock Exchange or
other principal stock exchange on which the Class B Common Stock is then listed,
as reported by The Wall Street Journal (Northeast edition) as the 4:00 p.m. (New
York time) closing price or as reported by any other authoritative source
selected by the Company.

        (l)    "Initial RSU Grant" shall have the meaning set forth in
Section 2.1.

        (m)  "Outside Director" shall mean any member of the Board who is not an
employee of the Company or any of its Subsidiaries.

        (n)   "Participant" shall mean any Outside Director to whom Awards have
been granted under the Plan.

        (o)   "Plan" shall have the meaning set forth in Section 1.1.

        (p)   "Prorated RSU Grant" shall have the meaning set forth in
Section 2.1.

        (q)   "Separation" shall mean the separation of former Viacom Inc. into
two publicly-traded companies, CBS Corporation and new Viacom Inc., which was
completed on December 31, 2005.

        (r)   "Stock Option Plan" shall mean the CBS Corporation 2000 Stock
Option Plan for Outside Directors as amended as of December 31, 2005.

        (s)   "Subsidiary" shall mean a corporation (or a partnership or other
enterprise) in which the Company owns or controls, directly or indirectly, more
than 50% of the outstanding shares of stock normally entitled to vote for the
election of directors (or comparable equity participation and voting power).

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Section 1.3 Administration of the Plan.

        The Plan shall be administered by the members of the Board who are not
Outside Directors and such Board members shall determine all questions of
interpretation, administration and application of the Plan. Such Board members'
determinations shall be final and binding in all matters relating to the Plan.
The Board may authorize any officer of the Company to execute and deliver an
Agreement on behalf of the Company to a Participant.

Section 1.4 Eligible Persons.

        Awards shall be granted only to Outside Directors.

Section 1.5 Class B Common Stock Subject to the Plan.

        Subject to adjustment in accordance with the provisions of Article IV
hereof, the maximum number of shares of Class B Common Stock available for
Awards made under the Plan, on or after January 1, 2006, when aggregated with
the number of shares of Class B Common Stock available for Awards made under the
Stock Option Plan, on or after January 1, 2006, shall be 424,759 plus any shares
that are available to be regranted pursuant to the last sentence of this
Section 1.5. The shares of Class B Common Stock shall be made available from
authorized but unissued shares of Class B Common Stock or from shares of Class B
Common Stock issued and held in the treasury of the Company. The settlement of
any Awards under the Plan in any manner shall result in a decrease in the number
of shares of Class B Common Stock which thereafter may be issued for purposes of
this Section 1.5 by the number of shares issued upon such settlement. Shares of
Class B Common Stock with respect to which Awards lapse, expire or are cancelled
without being settled or are otherwise terminated may be regranted under the
Plan.

ARTICLE II

RESTRICTED SHARE UNITS

Section 2.1 Grants of Restricted Share Units.

        (a)   On the date of the Company's 2005 Annual Meeting of Stockholders,
each Outside Director as of such date shall automatically be granted a number of
Director RSUs determined by dividing (i) $55,000 by (ii) the Fair Market Value
of one share of Class B Common Stock on the date of grant, with each fractional
RSU rounded up to the next highest whole RSU (the "Initial RSU Grant"). The
Initial RSU Grant is made in respect of the period from the date of the
Company's 2005 Annual Meeting of Stockholders through January 31, 2006, and only
persons who are Outside Directors as of the Company's 2005 Annual Meeting of
Stockholders shall be entitled to receive the Initial RSU Grant.

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        (b)   On January 31st of 2006 and 2007, each Outside Director shall
automatically be granted a number of Director RSUs determined by dividing
(i) $55,000 by (ii) the Fair Market Value of one share of Class B Common Stock
on the date of grant, with each fractional RSU rounded up to the next highest
whole RSU (an "Annual RSU Grant").

        (c)   On January 31, 2008 and each January 31st thereafter, each Outside
Director shall automatically be granted an Annual RSU Grant determined by
dividing (i) $75,000 by (ii) the Fair Market Value of one share of Class B
Common Stock on the date of grant, with each fractional RSU rounded up to the
next highest whole RSU.

        (d)   Effective November 1, 2007, in the event that an Outside Director
joins the Board following the date of an Annual RSU Grant, but during the
calendar year of the grant, such Outside Director shall automatically receive,
five (5) business days following the date he or she joins the Board, a Prorated
RSU Grant. A "Prorated RSU Grant" shall mean a grant of a number of Director
RSUs determined by dividing (i) the product of (a) the value of the Annual RSU
Grant for that calendar year divided by 12 and (b) the number of months
remaining in such calendar year from the date the Outside Director joins the
Board (counting the month of joining as a full month), by (ii) the Fair Market
Value of one share of Class B Common Stock on the date of grant, with each
fractional RSU rounded up to the next highest whole RSU (the "Prorated RSU
Grant").

        With respect to calendar year 2007, an Outside Director who joined the
Board following the date of the 2007 Annual RSU Grant but prior to November 1,
2007 shall receive a Prorated RSU Grant on November 1, 2007.

        (e)   With respect to the Initial RSU Grant, each Annual RSU Grant and
each Prorated RSU Grant, if the relevant date of grant is not a business day on
which the Fair Market Value can be determined, then the Fair Market Value shall
be determined as of the last business day preceding the relevant date of grant
on which the Fair Market Value can be determined. The terms and conditions of
the Director RSUs shall be set forth in an Agreement which shall be delivered to
the Participants reasonably promptly following the relevant date of grant of
such Director RSUs.

Section 2.2 Vesting.

        Director RSUs shall be settled only to the extent the Participant is
vested therein. Subject to Section 2.3(b), the Initial RSU Grant and each Annual
RSU Grant shall vest on the first anniversary of the relevant date of grant. A
Prorated RSU Grant shall vest on the first anniversary of the date of grant of
the Annual RSU Grant that was awarded during the calendar year in which the
Participant received such Prorated RSU Grant.

Section 2.3 Settlement of Restricted Share Units.

        (a)   Settlement.    On the date on which Director RSUs vest, all
restrictions contained in the Agreement covering such Director RSUs and in the
Plan shall lapse as to such Director RSUs, and the Director RSUs shall be
payable in shares of Class B

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Common Stock and shall be evidenced in such manner as the Board in its
discretion shall deem appropriate, including, without limitation, book-entry
registration or issuance of one or more stock certificates. If stock
certificates are issued, such certificates shall be delivered to the Participant
or such certificates shall be credited to a brokerage account if the Participant
so directs; provided, however, that such certificates shall bear such legends as
the Board, in its sole discretion, may determine to be necessary or advisable in
order to comply with applicable federal or state securities laws.

        (b)   Settlement in the Event of Termination of Services.    If the
services of a Participant as a director of the Company terminate for any reason
the Participant shall forfeit all unvested Director RSUs as of the date of such
event.

        (c)   Deferral of Settlement.    Notwithstanding Section 2.3(a), a
Participant may elect to defer settlement of any or all Director RSUs to a date
subsequent to the vesting date of such Director RSUs, provided that, with
respect to each Annual RSU Grant, such election to defer is made no later than
December 31 of the taxable year prior to the year in which the Outside Director
performs the services for which such Director RSUs are granted, with respect to
the Initial RSU Grant, such election to defer is made within 30 days of the date
of the Company's 2005 Annual Meeting of Stockholders and with respect to each
Prorated RSU Grant, such election to defer is made prior to the date of grant,
except that, with respect to Prorated RSU Grants for the calendar year 2007,
such grants shall not be eligible for deferral. Settlement of any deferred
Director RSUs shall be made in a single distribution or three or five annual
installments in accordance with the Participant's deferral election. The single
distribution or first annual installment, as applicable, will be payable on the
later of (i) six months following the date of the Participant's termination of
services on the Board for any reason or (ii) January 31 of the calendar year
following the calendar year in which the Participant's services on the Board
terminates for any reason.

ARTICLE III

DIVIDEND EQUIVALENTS

        The Participant shall be entitled to receive Dividend Equivalents on the
Director RSUs in the event the Company pays a regular cash dividend with respect
to the shares of Class B Common Stock. The Company shall maintain a bookkeeping
record that credits the dollar amount of the Dividend Equivalents to a
Participant's account on the date that it pays such regular cash dividend on the
shares of Class B Common Stock. Dividend Equivalents shall accrue on the
Director RSUs until the Director RSUs vest, at which time they shall be paid in
shares of Class B Common Stock determined by dividing (i) the aggregate amount
credited in respect of such Dividend Equivalents by (ii) the Fair Market Value
on the vesting date, with any fractional shares resulting from this calculation
rounded up to the next highest whole share. Payment of Dividend Equivalents that
have been credited to the Participant's account will not be made with respect to
any Director RSUs that do not vest and are cancelled.

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        In addition, if the Participant elects to defer settlement of the
Director RSUs, as permitted under Section 2.3(c), such Director RSUs will
continue to earn Dividend Equivalents on the deferred Director RSUs through the
settlement date. All such Dividend Equivalents credited to the Participant's
account with respect to deferred Director RSUs shall be converted, on the
anniversary of the date on which the Director RSUs originally vested and on each
anniversary thereof, as appropriate, until the Director RSUs are settled, into
additional whole Director RSUs, based on the Fair Market Value of the Class B
Common Stock on the respective dates. Such additional Director RSUs shall be
deferred subject to the same terms and conditions as the Directors RSUs to which
the Dividend Equivalents originally related.

ARTICLE IV

EFFECT OF CERTAIN CORPORATE CHANGES

        In the event of any merger, consolidation, stock-split, dividend (other
than a regular cash dividend), distribution, combination, recapitalization,
reclassification, reorganization, split-off or spin-off that changes the
character or amount of the shares of Class B Common Stock or any other changes
in the corporate structure, equity securities or capital structure of the
Company, the Board shall make such proportionate adjustments to (i) the number
and kind of securities subject to any outstanding Awards, (ii) the number and
kind of securities subject to the Initial RSU Grant, the Prorated RSU Grants and
the Annual RSU Grants referred to in Section 2.1, and (iii) the maximum number
and kind of securities available for issuance under the Plan referred to in
Section 1.5, in each case, as it deems appropriate. The Board may, in its sole
discretion, also make such other adjustments as it deems appropriate in order to
preserve, but not increase, the benefits or potential benefits intended to be
made available hereunder upon the occurrence of any of the foregoing events. The
Board's determination as to what, if any, adjustments shall be made shall be
final and binding on the Company and all Participants. Adjustments under this
Article shall be conducted in a manner consistent with any adjustments under the
Stock Option Plan.

ARTICLE V

MISCELLANEOUS

Section 5.1 No Right to Re-election.

        Nothing in the Plan shall be deemed to create any obligation on the part
of the Board to nominate any of its members for re-election by the Company's
stockholders, nor confer upon any Participant the right to remain a member of
the Board for any period of time, or at any particular rate of compensation.

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Section 5.2 Restriction on Transfer.

        The rights of a Participant with respect to any Awards under the Plan
shall not be transferable by the Participant to whom such Awards are granted,
except (i) by will or the laws of descent and distribution, (ii) upon prior
notice to the Company, for transfers to members of the Participant's immediate
family or trusts whose beneficiaries are members of the Participant's immediate
family, provided, that such transfer is being made for estate and/or tax
planning purposes without consideration being received therefore, (iii) upon
prior notice to the Company, for transfers to a former spouse incident to a
divorce or (iv) for such other transfers as the Board may approve, subject to
any conditions and limitations that it may, in its sole discretion, impose.

Section 5.3 Stockholder Rights.

        No grant of an Award under the Plan shall entitle a Participant, a
Participant's estate or a permitted transferee to any rights of a holder of
shares of Class B Common Stock, except upon the delivery of share certificates
to a Participant, the Participant's estate or the permitted transferee upon
settlement of an Award.

Section 5.4 No Restriction on Right of Company to Effect Corporate Changes.

        The Plan shall not affect in any way the right or power of the Company
or its stockholders to make or authorize any or all adjustments,
recapitalizations, reorganizations or other changes in the Company's capital
structure or its business, or any merger or consolidation of the Company, or any
issue of stock or of options, warrants or rights to purchase stock or of bonds,
debentures, preferred or prior preference stocks whose rights are superior to or
affect the shares of Class B Common Stock or the rights thereof or which are
convertible into or exchangeable for shares of Class B Common Stock, or the
dissolution or liquidation of the Company, or any sale or transfer of all or any
part of its assets or business, or any other corporate act or proceeding,
whether of a similar character or otherwise.

Section 5.5 Headings.

        The headings of articles and sections herein are included solely for
convenience of reference and shall not affect the meaning of any of the
provisions of the Plan.

Section 5.6 Governing Law.

        The Plan and all rights hereunder shall be construed in accordance with
and governed by the laws of the State of Delaware.

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ARTICLE VI

AMENDMENT AND TERMINATION

        The Board may at any time and from time to time alter, amend, suspend or
terminate the Plan in whole or in part, including, without limitation, amend the
provisions for determining the amount of Director RSUs to be issued to an
Outside Director, provided, however, that any amendment which under the
requirements of applicable law or under the rules of the New York Stock Exchange
or other principal stock exchange on which the shares of Class B Common Stock
are then listed must be approved by the stockholders of the Company shall not be
effective unless and until such stockholder approval has been obtained in
compliance with such law or rule; and no alteration, amendment, suspension or
termination of the Plan that would adversely affect a Participant's rights under
the Plan with respect to any Award made prior to such action shall be effective
as to such Participant unless he or she consents thereto, provided, however,
that no such consent shall be required if the Board determines in its sole
discretion that any such alteration, amendment, suspension or termination is
necessary or advisable to comply with any law, regulation, ruling, judicial
decision or accounting standards or to ensure that Director RSUs or Dividend
Equivalents are not subject to federal, state or local income tax prior to
settlement.

ARTICLE VII

EFFECTIVE DATE

        The Effective Date of the Plan is May 26, 2005, the date on which
stockholder approval was first obtained at the Company's 2005 Annual Meeting of
Stockholders. The first amendment and restatement thereof became effective as of
May 25, 2006, the date on which stockholder approval was obtained at the
Company's 2006 Annual Meeting of Stockholders. The second amendment and
restatement thereof became effective as of May 23, 2007. The third amendment and
restatement thereof became effective as of November 1, 2007. Unless earlier
terminated in accordance with Article VI above, the Plan shall terminate on the
fifth anniversary of the Effective Date, and no further Awards may be granted
hereunder after such date.

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QuickLinks

Exhibit 10(b)

CBS CORPORATION 2005 RSU PLAN FOR OUTSIDE DIRECTORS (as amended and restated
through November 1, 2007)
ARTICLE I GENERAL
ARTICLE II RESTRICTED SHARE UNITS
ARTICLE III DIVIDEND EQUIVALENTS
ARTICLE IV EFFECT OF CERTAIN CORPORATE CHANGES
ARTICLE V MISCELLANEOUS
ARTICLE VI AMENDMENT AND TERMINATION
ARTICLE VII EFFECTIVE DATE