io_uring/net: don't overconsume buffers when using MSG_TRUNC

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97618
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:16 UTC
Updated2026-09-25 11:17:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: io_uring/net: don't overconsume buffers when using MSG_TRUNC When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is larger than the provided buffer, the net layer returns the full length of the packet rather than the number of bytes actually copied into the buffer. As a result, io_uring advances more of the provided buffer ring than was actually filled. Use the actual filled region size to consume the buffer, but still return the full size to preserve MSG_TRUNC semantics. Take care with multishot, because that seems to already truncate the consumption based on the available payload size. This was reported in https://github.com/axboe/liburing/issues/1619. [axboe: fold in size_t unsigned fix]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ae98dbf43d755b4e111fcd086e53939bef3e9a1a 927d96f91c582b319d104ecf50ec935a8dc29193 git Not specified
CNA Linux Linux affected ae98dbf43d755b4e111fcd086e53939bef3e9a1a 2e70ea75c7bb38a6dc212975f887310f14f7c043 git Not specified
CNA Linux Linux affected ae98dbf43d755b4e111fcd086e53939bef3e9a1a 6028b543884f8735e057ec9eea4908cd61cab230 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2e70ea75c7bb38a6dc212975f887310f14f7c043 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6028b543884f8735e057ec9eea4908cd61cab230 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/927d96f91c582b319d104ecf50ec935a8dc29193 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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