CVE-2026-31407netfilter: conntrack: add missing netlink policy validations
- 7.1HighCVSS 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: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
Timeline
ID reserved
By Linux
- 28 days later
· 28 days later
Published
- 7 months later
· 7 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 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < e7b5766693477c52424cc6c79dd30a7a9c7db52c
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < 78bba9f73942aa7dca47d817d8cec0fb9b443b70
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < be88a337bf07afb1ee173f1099294d1b7ab3fefe
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < c5e918390002edf0cff80a0e7ce1f86f16a9507c
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < 9174d28f3f15d8c4962f5980c0be167633880443
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < 67c53c1978cef3c504237275e39c857e2f6af56e
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < 0fbae1e74493d5a160a70c51aeba035d8266ea7d
- affected a258860e01b80e8f554a4ab1a6c95e6042eb8b73 – < f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05
- affected 2.6.27
- unaffected < 2.6.27
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.136 – ≤ 6.6.*
- unaffected 6.12.83 – ≤ 6.12.*
- unaffected 6.18.24 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References9
- https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c (opens in a new tab)
- https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70 (opens in a new tab)
- https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe (opens in a new tab)
- https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c (opens in a new tab)
- https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443 (opens in a new tab)
- https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e (opens in a new tab)
- https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d (opens in a new tab)
- https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 (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-2026-19197 (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-2026-31407)Record last updated .