CVE-2026-23392netfilter: nf_tables: release flowtable after rcu grace period on error
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% 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: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.
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)
- 0.17% · top 94% 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 7.8.
Affected products
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < 29538fb3f412f3ce5ad9f97fe7fd84952dacd3af
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < ec0f801e5ce0162fc4fea95607c716b264d283fb
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < d2632de96ccb066e0131ad1494241b9c281c60b8
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < adee3436ccd29f1e514c028899e400cbc6d84065
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < 7e3955b282eae20d61c75e499c75eade51c20060
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < c8092edb9a11f20f95ccceeb9422b7dd0df337bd
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < e78a2dcc7cfb87b64a631441ca7681492b347ef6
- affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 – < d73f4b53aaaea4c95f245e491aa5eeb8a21874ce
- affected 4.16
- unaffected < 4.16
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References12
- https://git.kernel.org/stable/c/29538fb3f412f3ce5ad9f97fe7fd84952dacd3af (opens in a new tab)
- https://git.kernel.org/stable/c/ec0f801e5ce0162fc4fea95607c716b264d283fb (opens in a new tab)
- https://git.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8 (opens in a new tab)
- https://git.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065 (opens in a new tab)
- https://git.kernel.org/stable/c/7e3955b282eae20d61c75e499c75eade51c20060 (opens in a new tab)
- https://git.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bd (opens in a new tab)
- https://git.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6 (opens in a new tab)
- https://git.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ce (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-2026-15393 (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-2026-23392)Record last updated .