sctp: validate chunk length in the inqueue parser

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99128
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:32 UTC
Updated2026-10-30 13:21:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: validate chunk length in the inqueue parser SCTP chunks always include a four-byte generic header, but sctp_inq_pop() currently accepts shorter declared lengths. A zero-length chunk leaves chunk_end at the current header. When ASCONF is covered by the association's SCTP-AUTH policy, sctp_assoc_bh_rcv() can continue before the state machine performs its normal chunk-length check. sctp_inq_pop() then returns the same malformed chunk repeatedly and the receive softirq can lock up. A remote SCTP peer can trigger this after establishing an association on a kernel built with CONFIG_IP_SCTP and configured with net.sctp.addip_enable=1 and net.sctp.auth_enable=1. The reproducer did not require application credentials, a shared SCTP AUTH key, or net.sctp.addip_noauth_enable=1. On commit f967455fb2a5 ("seg6: reset IP6CB after IPv6 decapsulation"), one zero-length ASCONF caused repeated watchdog soft-lockup reports in a two-vCPU KVM guest. All 3 pre-trigger health probes succeeded, while 36 of 37 post-trigger probes failed. With this change, all 37 post-trigger probes succeeded and no equivalent soft-lockup signature appeared. Reject chunks shorter than the generic SCTP header at the shared inqueue parser boundary. Mark the packet for discard before either caller can continue processing it, while preserving the four-byte generic minimum. Declared-length 1 through 4 controls and kernel-generated ASCONF traffic remained healthy. The patched sctp_hello selftest passed for IPv4 and IPv6. The complete private reproducer and validation evidence are available directly to maintainers on request.

Risk And Classification

EPSS: 0.001740000 probability, percentile 0.068890000 (date 2026-10-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e b0dbd53b242609c88e81b0a49093bdbef5d5a418 git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e 5a7ee52589dae36c93dc64d7a97c5ded84618572 git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e e0fb7fe180488a5afa2e91509ea838e8df8cb771 git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e 40507f59f230dcf60ae13cb48d34f8c6e9f40659 git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e 9ac57e4c62e93c287b36080e5da3645690549990 git Not specified
CNA Linux Linux affected bbd0d59809f923ea2b540cbd781b32110e249f6e 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/40507f59f230dcf60ae13cb48d34f8c6e9f40659 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0dbd53b242609c88e81b0a49093bdbef5d5a418 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc4a4f1d6b6d725438dc37b97f03d95ed9feb63f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ac57e4c62e93c287b36080e5da3645690549990 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d28ea1a62e27210d8ea3cf496dfae85dbdd7b84f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0fb7fe180488a5afa2e91509ea838e8df8cb771 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a7ee52589dae36c93dc64d7a97c5ded84618572 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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