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nvd416baaa9-dc9f-4396-8d5f-8c081fb06d67NVD:CVE-2024-26740
HistoryApr 03, 2024 - 5:15 p.m.

CVE-2024-26740

2024-04-0317:15:51
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
1
linux kernel vulnerability
act_mirred
mirred ingress
deadlock
tcp_v4_rcv
lockdep

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%

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.

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%