CVE-2024-26740
Assigner: Linux
Published: 2024-04-03T17:00:25.534Z
State: PUBLISHED
descriptions: value: In the Linux kernel, the following vulnerability has been resolved:

net/sched: act_mirred: use the backlog for mirred ingress

The test Davide added in commit ca22da2fbd69 ("act_mirred: use the backlog
for nested calls to mirred ingress") hangs our testing VMs every 10 or so
runs, with the familiar tcp_v4_rcv -> tcp_v4_rcv deadlock reported by
lockdep.

The problem as previously described by Davide (see Link) is that
if we reverse flow of traffic with the redirect (egress -> ingress)
we may reach the same socket which generated the packet. And we may
still be holding its socket lock. The common solution to such deadlocks
is to put the packet in the Rx backlog, rather than run the Rx path
inline. Do that for all egress -> ingress reversals, not just once
we started to nest mirred calls.

In the past there was a concern that the backlog indirection will
lead to loss of error reporting / less accurate stats. But the current
workaround does not seem to address the issue.
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 53592b364001
lessThan: 7c787888d164
status: affected
versionType: git
version: 53592b364001
lessThan: 60ddea1600bc
status: affected
versionType: git
version: 53592b364001
lessThan: 52f671db1882
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 4.10
status: affected
version: 0
lessThan: 4.10
status: unaffected
versionType: custom
version: 6.6.19
lessThanOrEqual: 6.6.*
status: unaffected
versionType: custom
version: 6.7.7
lessThanOrEqual: 6.7.*
status: unaffected
versionType: custom
version: 6.8
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: net/sched: act_mirred: use the backlog for mirred ingress
x_generator: engine: bippy-d3b290d2becc