rxrpc: serialize kernel accept preallocation with socket teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74436
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:45 UTC
Updated2026-08-15 06:22:45 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 0337cdba0c477f176c0459bed012109453184573 git Not specified
CNA Linux Linux affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5 git Not specified
CNA Linux Linux affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 35a967ff8b24db09ee429c39c5b5e6571639997d git Not specified
CNA Linux Linux affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 1741378a7a83dfd8e53a9196730df709b903cd33 git Not specified
CNA Linux Linux affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 dc175389b18c29a5303ee83169ec653adfae3e17 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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