CVE-2026-43403nsfs: tighten permission checks for ns iteration ioctls
- 8.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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: nsfs: tighten permission checks for ns iteration ioctls Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 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 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 – < 3376b345df155ca36d8611857b41ff7d5183fc38
- affected a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 – < 2f3dea284c761c890d676f77d5e55c0c496b4ef4
- affected a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 – < 0ad650e60150eda789deca5e78a6a09d26bf8fc9
- affected a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 – < e6b899f08066e744f89df16ceb782e06868bd148
- affected 6.12
- unaffected < 6.12
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References4
- https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38 (opens in a new tab)
- https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4 (opens in a new tab)
- https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9 (opens in a new tab)
- https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148 (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-2026-28709 (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-2026-43403)Record last updated .