sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks

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Summary

CVECVE-2026-53004
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:11 UTC
Updated2026-07-14 20:05:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks sctp_getsockopt_peer_auth_chunks() checks that the caller's optval buffer is large enough for the peer AUTH chunk list with if (len < num_chunks) return -EINVAL; but then writes num_chunks bytes to p->gauth_chunks, which lives at offset offsetof(struct sctp_authchunks, gauth_chunks) == 8 inside optval. The check is missing the sizeof(struct sctp_authchunks) = 8-byte header. When the caller supplies len == num_chunks (for any num_chunks > 0) the test passes but copy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes past the declared buffer. The sibling function sctp_getsockopt_local_auth_chunks() at the next line already has the correct check: if (len < sizeof(struct sctp_authchunks) + num_chunks) return -EINVAL; Align the peer variant with its sibling. Reproducer confirms on v7.0-13-generic: an unprivileged userspace caller that opens a loopback SCTP association with AUTH enabled, queries num_chunks with a short optval, then issues the real getsockopt with len == num_chunks and sentinel bytes painted past the buffer observes those sentinel bytes overwritten with the peer's AUTH chunk type. The bytes written are under the peer's control but land in the caller's own userspace; this is not a kernel memory corruption, but it is a kernel-side contract violation that can silently corrupt adjacent userspace data.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001760000 probability, percentile 0.073310000 (date 2026-07-13)

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 a132e199de69e2a45628aa8534df1bf5d44e1b6e git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 2b5a2c957c7769d40110f725cf23987fcef50d75 git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 d45c7e99caf915b0f6c716bd8ffe9d45b9685761 git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 d67fbc6dea5dbf7f46c618ebf65910a276078e20 git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 6849b995cda88a677bf08a05765d1db7905974fc git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 70a089cc9590aa347a61e84434116ab74619e3c3 git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 6bcf8fe4ef7967b22b814cbae9a57bbd3c853410 git Not specified
CNA Linux Linux affected 65b07e5d0d09c77e98050b5f0146ead29e5add32 0cf004ffb61cd32d140531c3a84afe975f9fc7ea 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 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b5a2c957c7769d40110f725cf23987fcef50d75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a132e199de69e2a45628aa8534df1bf5d44e1b6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/70a089cc9590aa347a61e84434116ab74619e3c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d67fbc6dea5dbf7f46c618ebf65910a276078e20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6849b995cda88a677bf08a05765d1db7905974fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d45c7e99caf915b0f6c716bd8ffe9d45b9685761 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0cf004ffb61cd32d140531c3a84afe975f9fc7ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6bcf8fe4ef7967b22b814cbae9a57bbd3c853410 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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