CVE-2026-72111bpf: Reset register bounds before narrowing retval range in check_mem_access()
- 8.8HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 93% 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: Reset register bounds before narrowing retval range in check_mem_access() When the BPF verifier processes a context load of an LSM hook return value, it calls __mark_reg_s32_range() to narrow the register to the hook's valid range. However, __mark_reg_s32_range() intersects the new range with the register's existing bounds using max_t()/min_t() rather than replacing them. If the destination register carries stale bounds from a prior instruction (e.g. BPF_MOV64_IMM), the intersection can produce a range narrower than reality. The verifier then believes it knows the register's exact value, while at runtime the actual hook return value is loaded, creating a verifier/runtime mismatch that can be used to bypass BPF memory safety checks. The else branch already calls mark_reg_unknown() to reset register state before any narrowing. Apply the same reset in the is_retval path so stale bounds are cleared before __mark_reg_s32_range() intersects.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 2 months later
· 2 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 · Received | 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)
- 0.18% · top 93% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected 5d99e198be279045e6ecefe220f5c52f8ce9bfd5 – < bde92f65042ec14389782dd223f706bf6b59ce5d
- affected 5d99e198be279045e6ecefe220f5c52f8ce9bfd5 – < 0993dc5fc619c0b25ab1310cb11d65e78351c0fe
- affected 5d99e198be279045e6ecefe220f5c52f8ce9bfd5 – < 5a55f9aecc08990940e70f0c7048a80850c5a16a
- affected 5d99e198be279045e6ecefe220f5c52f8ce9bfd5 – < 5e0b273e0a62cc04ec338c7b502797c66c2ed42a
- affected 1050727d83e70449991c29dd1cf29fe936a63da3
- affected 27ca3e20fe80be85a92b10064dfeb56cb2564b1c
- affected 6.10.13 – < 6.11
- affected 6.11.2 – < 6.12
- affected 6.12
- unaffected < 6.12
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/bde92f65042ec14389782dd223f706bf6b59ce5d (opens in a new tab)
- https://git.kernel.org/stable/c/0993dc5fc619c0b25ab1310cb11d65e78351c0fe (opens in a new tab)
- https://git.kernel.org/stable/c/5a55f9aecc08990940e70f0c7048a80850c5a16a (opens in a new tab)
- https://git.kernel.org/stable/c/5e0b273e0a62cc04ec338c7b502797c66c2ed42a (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-2026-59069 (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-2026-72111)Record last updated .