CVE-2026-74436

rxrpc: serialize kernel accept preallocation with socket teardown

State: Published
Severity: 9.8 Critical
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before d6207326b4ca0ae1041281b6af9df53f8080669aAffected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 11b429b84c87cb5a0152f14e7d6cb649ed363901Affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before c20d983968f239574290cf804a58cde18ad1c559Affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 0337cdba0c477f176c0459bed012109453184573Affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5Affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 35a967ff8b24db09ee429c39c5b5e6571639997dAffected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 1741378a7a83dfd8e53a9196730df709b903cd33Affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before dc175389b18c29a5303ee83169ec653adfae3e17Affected
LinuxLinux	4.9Affected before 4.9Not affected 5.10.266 through 5.10.Not affected 5.15.217 through 5.15.Not affected 6.1.184 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before d6207326b4ca0ae1041281b6af9df53f8080669aAffected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 11b429b84c87cb5a0152f14e7d6cb649ed363901Affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before c20d983968f239574290cf804a58cde18ad1c559Affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 0337cdba0c477f176c0459bed012109453184573Affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5Affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 35a967ff8b24db09ee429c39c5b5e6571639997dAffected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before 1741378a7a83dfd8e53a9196730df709b903cd33Affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to before dc175389b18c29a5303ee83169ec653adfae3e17Affected

LinuxLinux

4.9Affected
before 4.9Not affected
5.10.266 through 5.10.*Not affected
5.15.217 through 5.15.*Not affected
6.1.184 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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