sctp: check RCV_SHUTDOWN after the sendmsg connect wait

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98846
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:38 UTC
Updated2026-10-21 13:21:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: check RCV_SHUTDOWN after the sendmsg connect wait sctp_wait_for_connect() drops the socket lock while it sleeps. An out-of-the-blue ABORT can then be processed from the socket backlog and unlink the association. If a concurrent shutdown(fd, SHUT_RD) sets RCV_SHUTDOWN, the waiter breaks with err == 0 before checking asoc->base.dead. Its final sctp_association_put() can then free the association, leaving sctp_sendmsg_to_asoc() to continue with a dangling pointer. Check RCV_SHUTDOWN along with the wait error in sctp_sendmsg_to_asoc() before using the association again. The check only accesses the socket, so it needs no additional association reference. Return the existing -ESRCH so that sctp_sendmsg() skips freeing a new association that may already have been destroyed. Keep sctp_wait_for_connect() unchanged to preserve its behavior for the connect() caller.

Risk And Classification

EPSS: 0.001560000 probability, percentile 0.043910000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 1bef1944ef15a40797305bf916827b04df6307ca git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 e8f972b1759d26bbefe4c524caae1ed7c8a593bd git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 e701345d886e831fb593a0870d69c8c5de6fc938 git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669 git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 4f1da630d13de0370e2f6361f961f1c8b384af1c git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e701345d886e831fb593a0870d69c8c5de6fc938 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8f972b1759d26bbefe4c524caae1ed7c8a593bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f1da630d13de0370e2f6361f961f1c8b384af1c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1bef1944ef15a40797305bf916827b04df6307ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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