CVE-2026-23274netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
- 7.8HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% 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: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 8 months later
· 8 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 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (12 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 7.8.
Affected products
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 144f88054ba0180467356f40895bd660b5dceeec
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 28c7cfaf0c0ab17cbd7754092116fd1af45271f9
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 54080355999381fed4a26129579a5765bab87491
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 5e7ece24c5cb75a60402aad4d803c7898ea40aa9
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < f228b9ae2a7e84d1153616d8e71c4236cb1f1309
- affected 68983a354a655c35d3fb204489d383a2a051fda7 – < 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf
- affected 5.7
- unaffected < 5.7
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References12
- https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 (opens in a new tab)
- https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec (opens in a new tab)
- https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9 (opens in a new tab)
- https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491 (opens in a new tab)
- https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9 (opens in a new tab)
- https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 (opens in a new tab)
- https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309 (opens in a new tab)
- https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (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-2026-13610 (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-2026-23274)Record last updated .