Critical 9.8Published Aug 15, 2026

CVE-2026-74436rxrpc: serialize kernel accept preallocation with socket teardown

Updated under an hour ago (Oct 27, 2026, 6:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before d6207326b4ca0ae1041281b6af9df53f8080669a; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 11b429b84c87cb5a0152f14e7d6cb649ed363901; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before c20d983968f239574290cf804a58cde18ad1c559; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 0337cdba0c477f176c0459bed012109453184573; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 35a967ff8b24db09ee429c39c5b5e6571639997d; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 1741378a7a83dfd8e53a9196730df709b903cd33; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before dc175389b18c29a5303ee83169ec653adfae3e17	CNA record

References

References

https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a
https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901
https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559
https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573
https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5
https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d
https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33
https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.