CVE-2026-74436

In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-25)

Published

2026-08-15

Modified

2026-10-16

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573
• https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901
• https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33
• https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d
• https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559

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