CVE-2026-74492netfilter: ipset: do not update comments from kernel-side hash adds
- 8.4HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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.
Timeline
ID reserved
By Linux
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 96% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < 6f13f4d52d06986c18f12e8bffaab944dd27ceab
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < f9d6cabff1fca010562dcdb0d22b296bdca3ba5a
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < 16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < 661ff9c0cfbe07f8eed920dde9f7781491738207
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < c710e9bf38e4e71a8db85d26a0f70c0674664207
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < 4ae701848e4ba9e9713375fb7d82218cbd309da2
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < 77dbb248a5cc7a5270cd37bbb0b635bf059a872a
- affected f66ee0410b1c3481ee75e5db9b34547b4d582465 – < f30415929be8aeb002d557c8d3f7ab2d2188003a
- affected 5dd9488ae41070b69d2f4acb580f77db5705f9ca
- affected a469bab3386aebff33c59506f3a95e35b91118fd
- affected 5.4.24 – < 5.5
- affected 5.5.8 – < 5.6
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.151 – ≤ 6.6.*
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.44 – ≤ 6.18.*
- unaffected 7.1.8 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/6f13f4d52d06986c18f12e8bffaab944dd27ceab (opens in a new tab)
- https://git.kernel.org/stable/c/f9d6cabff1fca010562dcdb0d22b296bdca3ba5a (opens in a new tab)
- https://git.kernel.org/stable/c/16bfa7be2d76ca1e0aacfa363482e1bf8ab5042a (opens in a new tab)
- https://git.kernel.org/stable/c/661ff9c0cfbe07f8eed920dde9f7781491738207 (opens in a new tab)
- https://git.kernel.org/stable/c/c710e9bf38e4e71a8db85d26a0f70c0674664207 (opens in a new tab)
- https://git.kernel.org/stable/c/4ae701848e4ba9e9713375fb7d82218cbd309da2 (opens in a new tab)
- https://git.kernel.org/stable/c/77dbb248a5cc7a5270cd37bbb0b635bf059a872a (opens in a new tab)
- https://git.kernel.org/stable/c/f30415929be8aeb002d557c8d3f7ab2d2188003a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59685 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74492)Record last updated .