rxrpc: Don't move a peeked OOB message onto the pending queue

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74434
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: Don't move a peeked OOB message onto the pending queue rxrpc_recvmsg_oob() takes a received oob message off recvmsg_oobq and, if a response is needed, moves it onto the pending_oobq tree. However, only the unlink from recvmsg_oobq is guarded by MSG_PEEK; the move onto pending_oobq always runs. As a result, reading a challenge with MSG_PEEK leaves the skb on recvmsg_oobq while also adding it to pending_oobq. Since struct sk_buff's rbnode shares storage with its next and prev pointers, rb_insert_color() overwrites the list linkage, and the skb, which holds a single reference, becomes reachable from both queues at once. When the socket is closed both queues are drained in turn. While draining recvmsg_oobq, __skb_unlink() follows the next and prev pointers that rbnode has overwritten and writes to a bad address. Also, as the skb holds a single reference but is freed from each queue, both the skb and the connection reference it holds are released twice. This leads to memory corruption and to a use-after-free caused by the connection refcount underflow. MSG_PEEK does not consume the message from the queue, so only unlink it from recvmsg_oobq and then move it onto pending_oobq or free it when the message is actually consumed.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5800b1cf3fd8ccab752a101865be1e76dac33142 9ada3931beb37068fcb725b34b0398457009f343 git Not specified
CNA Linux Linux affected 5800b1cf3fd8ccab752a101865be1e76dac33142 5f470cc883416fea6d3bce18ef96bf91dd49ffc3 git Not specified
CNA Linux Linux affected 5800b1cf3fd8ccab752a101865be1e76dac33142 5801cff7d5d7b4e9d877dfb627b23eb63167f02c git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 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/5801cff7d5d7b4e9d877dfb627b23eb63167f02c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ada3931beb37068fcb725b34b0398457009f343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f470cc883416fea6d3bce18ef96bf91dd49ffc3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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