netfilter: ipset: do not update comments from kernel-side hash adds

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74492
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:54 UTC
Updated2026-08-19 17:21:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: do not update comments from kernel-side hash adds mtype_resize() copies comment pointers with memcpy(), not the comment objects themselves. During the window after an entry has been copied but before the table swap and backlog replay, the old table is still published for packet-side updates while the replacement-table entry already holds the same ip_set_comment_rcu pointer. If xt_SET --add-set ... --exist hits that old entry in this window, mtype_add() calls ip_set_init_comment() even though packet-side adds carry no comment payload. That call frees the shared comment through the old entry, so the replacement-table entry now holds a stale pointer. When the queued add is replayed on the new table, mtype_add() calls ip_set_init_comment() again and strlen() dereferences the stale pointer. Fix this in mtype_add() by skipping ip_set_init_comment() when ext->target marks a packet-side add. Userspace adds still update comments, while packet-side adds can no longer free comment storage shared with a resize copy.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001420000 probability, percentile 0.039850000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 6f13f4d52d06986c18f12e8bffaab944dd27ceab git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 f9d6cabff1fca010562dcdb0d22b296bdca3ba5a git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 661ff9c0cfbe07f8eed920dde9f7781491738207 git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 c710e9bf38e4e71a8db85d26a0f70c0674664207 git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 4ae701848e4ba9e9713375fb7d82218cbd309da2 git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 77dbb248a5cc7a5270cd37bbb0b635bf059a872a git Not specified
CNA Linux Linux affected f66ee0410b1c3481ee75e5db9b34547b4d582465 f30415929be8aeb002d557c8d3f7ab2d2188003a git Not specified
CNA Linux Linux affected 5dd9488ae41070b69d2f4acb580f77db5705f9ca git Not specified
CNA Linux Linux affected a469bab3386aebff33c59506f3a95e35b91118fd git Not specified
CNA Linux Linux affected 5.4.24 5.5 semver Not specified
CNA Linux Linux affected 5.5.8 5.6 semver Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 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/77dbb248a5cc7a5270cd37bbb0b635bf059a872a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ae701848e4ba9e9713375fb7d82218cbd309da2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9d6cabff1fca010562dcdb0d22b296bdca3ba5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/661ff9c0cfbe07f8eed920dde9f7781491738207 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f30415929be8aeb002d557c8d3f7ab2d2188003a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c710e9bf38e4e71a8db85d26a0f70c0674664207 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f13f4d52d06986c18f12e8bffaab944dd27ceab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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