sctp: fix stream->outcnt underflow on duplicate RECONF responses

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Summary

CVECVE-2026-89476
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:28 UTC
Updated2026-09-11 20:19:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: fix stream->outcnt underflow on duplicate RECONF responses A cached RECONF chunk may contain more than one request parameter. A duplicate response can therefore find and process the same ADD_OUT request again while another parameter is still outstanding, rolling back outcnt twice and possibly underflowing it. Track outstanding request types as bits and clear each bit after its first response. Later responses for the same request are then ignored.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 2d867663c563e8009257b9edf9c8ec75d9bbf19a git Not specified
CNA Linux Linux affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 d02a5794c3deedcb8476d017fcee2b7aaedab2e1 git Not specified
CNA Linux Linux affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 git Not specified
CNA Linux Linux affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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