CVE-2026-43306bpf: crypto: Use the correct destructor kfunc type
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% 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: bpf: crypto: Use the correct destructor kfunc type With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. I ran into the following type mismatch when running BPF self-tests: CFI failure at bpf_obj_free_fields+0x190/0x238 (target: bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc) Internal error: Oops - CFI: 00000000f2008228 [#1] SMP ... As bpf_crypto_ctx_release() is also used in BPF programs and using a void pointer as the argument would make the verifier unhappy, add a simple stub function with the correct type and register it as the destructor kfunc instead.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 days later
· 3 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)
- 0.12% · top 98% 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 3e1c6f35409f9e447bf37f64840f5b65576bfb78 – < 4e3e57dbf46dad3498f8c4219ce2dba756875962
- affected 3e1c6f35409f9e447bf37f64840f5b65576bfb78 – < 50d6fd69388cc7b05dce72f09080674dcede4ac9
- affected 3e1c6f35409f9e447bf37f64840f5b65576bfb78 – < 3979a550fe06b370d73647f59cf462fa525c9ec4
- affected 3e1c6f35409f9e447bf37f64840f5b65576bfb78 – < b40a5d724f29fc2eed23ff353808a9aae616b48a
- affected 6.10
- unaffected < 6.10
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.16 – ≤ 6.18.*
- unaffected 6.19.6 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References4
- https://git.kernel.org/stable/c/4e3e57dbf46dad3498f8c4219ce2dba756875962 (opens in a new tab)
- https://git.kernel.org/stable/c/50d6fd69388cc7b05dce72f09080674dcede4ac9 (opens in a new tab)
- https://git.kernel.org/stable/c/3979a550fe06b370d73647f59cf462fa525c9ec4 (opens in a new tab)
- https://git.kernel.org/stable/c/b40a5d724f29fc2eed23ff353808a9aae616b48a (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-2026-28576 (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-2026-43306)Record last updated .