sctp: prevent peer transport count overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74469
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:51 UTC
Updated2026-08-19 17:21:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.004150000 probability, percentile 0.347770000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef b453e00da1211e997b82743d28af7714c59c05c8 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef dfea32dd76f390e3155177b0038cc47b01386198 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef 80f48523a0fe42db2e7375dff4e38a25c117090a git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef 546221b86ceeba0d8fec92d46a0604bb7b62be07 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef 09e722030e8148ba4ed1e42c6b2ea57bda9f9895 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75 git Not specified
CNA Linux Linux affected 8f840e47f190cbe61a96945c13e9551048d42cef bd0e9289e2642f6a5c54faad304ce0f41e926d22 git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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