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CVE

CVE-2026-74436

rxrpc: serialize kernel accept preallocation with socket teardown
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CVE

CVE-2026-74436

rxrpc: serialize kernel accept preallocation with socket teardown

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: serialize kernel accept preallocation with socket teardown

rxrpckernelcharge_accept() reads rx->backlog without any

socket/backlog synchronization and passes that raw pointer into

rxrpcservicepreallocone(). A concurrent rxrpcdiscard_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 *backloghead/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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

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, https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a, https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17, https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74436.json, https://nvd.nist.gov/vuln/detail/CVE-2026-74436, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00399%
EPSS Percentile
0.32836%
Introduced Version
00e907127e6f86d0f9b122d9b4347a8aa09a8b61,4.9.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
dc175389b18c29a5303ee83169ec653adfae3e17,5.10.266,5.15.217,6.1.184,6.6.148,6.12.101,6.18.40,7.1.5,6.12.101-1~deb12u1,6.12.101-1

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