net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64047
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:45 UTC
Updated2026-07-20 15:17:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this: struct sk_msg_sg { [...] /* The extra two elements: * 1) used for chaining the front and sections when the list becomes * partitioned (e.g. end < start). The crypto APIs require the * chaining; * 2) to chain tailer SG entries after the message. */ struct scatterlist data[MAX_MSG_FRAGS + 2]; The current code uses MAX_SKB_FRAGS + 1 as the ring size: sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); This places the chain pointer at sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. = &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 = data[start + (MAX_SKB_FRAGS - start + 1) - 1] = data[MAX_SKB_FRAGS] instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down") Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001760000 probability, percentile 0.073880000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 73963a375885d5ccb7def39fd0b4f542e0f343dd git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 47110c3a9ac247b688657337f5981efcfcb240dc git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 84158c2997159df4a0d70cd9c46774512d32a522 git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 131ef12057d92b77b636321b7849c69222405a97 git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 66339b71f105e6f83e0da3b9583d95077534fe1d git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec eca989eab4b2599dcb02f72140a7c08f08838520 git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 2fb0dc7e0099686c4e9d2732745d8a31b18c3628 git Not specified
CNA Linux Linux affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 285943c6e7ca309bbea84b253745154241d9788a git Not specified
CNA Linux Linux affected d529d6c9f7e3aaeac13c4948f79799ccb825f29d git Not specified
CNA Linux Linux affected 5.4.14 5.5 semver Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 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 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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