CVE-2026-23403apparmor: fix memory leak in verify_header
- 5.5MediumCVSS 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: apparmor: fix memory leak in verify_header The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made. Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.
Timeline
ID reserved
By Linux
- 3 months later
· 3 months later
Published
- 40 days later
· 40 days 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 |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 9d678eb0fe55c9195d9a253e8c5b82a87b930737
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 6b79abcb3c985e153fcf9d395e1d4336081aabc2
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 663ce34786e759ebcbeb3060685c20bcc886d51a
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 786e2c2a87d9c505f33321d1fd23a176aa8ddeb1
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 4f0889f2df1ab99224a5e1ac4e20437eea5fe38e
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < 42fd831abfc15d0643c14688f0522556b347e7e6
- affected dd51c84857630e77c139afe4d9bba65fc051dc3f – < e38c55d9f834e5b848bfed0f5c586aaf45acb825
- affected 3.12
- unaffected < 3.12
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.169 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.77 – ≤ 6.12.*
- unaffected 6.18.18 – ≤ 6.18.*
- unaffected 6.19.8 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9d678eb0fe55c9195d9a253e8c5b82a87b930737 (opens in a new tab)
- https://git.kernel.org/stable/c/6b79abcb3c985e153fcf9d395e1d4336081aabc2 (opens in a new tab)
- https://git.kernel.org/stable/c/bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557 (opens in a new tab)
- https://git.kernel.org/stable/c/663ce34786e759ebcbeb3060685c20bcc886d51a (opens in a new tab)
- https://git.kernel.org/stable/c/786e2c2a87d9c505f33321d1fd23a176aa8ddeb1 (opens in a new tab)
- https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e (opens in a new tab)
- https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6 (opens in a new tab)
- https://git.kernel.org/stable/c/e38c55d9f834e5b848bfed0f5c586aaf45acb825 (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-2026-17831 (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-2026-23403)Record last updated .