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CVE-2026-43089xfrm_user: fix info leak in build_mapping()
- 5.5MediumCVSS 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: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 6 months later
· 6 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 |
|---|---|---|---|
| NVDNVD · Modified | 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)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < 521385cbd50ca9474396d88462fcdfa6489685d9
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < d3125c541a96fb3c0fc7210112684baf22b6c24d
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < 5a1a4b049ddde41466ccac0daeec326254b133f2
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < 700c9622b23c33b5933e6dcea816492c064e4e10
- affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 – < 1beb76b2053b68c491b78370794b8ff63c8f8c02
- affected 2.6.29
- unaffected < 2.6.29
- 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 6.19.14 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References11
- https://git.kernel.org/stable/c/521385cbd50ca9474396d88462fcdfa6489685d9 (opens in a new tab)
- https://git.kernel.org/stable/c/c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f (opens in a new tab)
- https://git.kernel.org/stable/c/72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 (opens in a new tab)
- https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d (opens in a new tab)
- https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2 (opens in a new tab)
- https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c (opens in a new tab)
- https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10 (opens in a new tab)
- https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02 (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-2026-27589 (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-2026-43089)Record last updated .