CVE-2026-99159ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()
- —Not scoredno CVSS score yet
- 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: ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx() On a persistent ring buffer, rb_meta_subbuf_idx() can return an index one sub-buffer too high. rb_setup_ids_meta_page() then fills subbuf_ids[] shifted by one and leaves subbuf_ids[0] NULL, which __rb_map_vma() dereferences when userspace maps trace_pipe_raw. rb_update_meta_reader() writes two such indices into meta->buffers[], which rb_cpu_meta_valid() would reject on the next boot, discarding the previous boot's trace. A CPU's sub-buffer array starts after its meta header and the nr_subbufs integers that follow, aligned up to a sub-buffer. rb_meta_subbuf_idx() inverts that calculation but skips only the integers, not the header, so its base is one sub-buffer low whenever the omitted header size crosses the alignment boundary. Invert the calculation with rb_subbufs_from_meta() rather than repeating it. rb_range_buffer() maps an index back to an address through the same helper, so the two directions can no longer disagree.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 2 days later
· 2 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected b14d032973d4e6c36e025e96ea3437de53d072d9 – < 0c0cf2240bb5ca5704ea932ba66ee54f43173915
- affected b14d032973d4e6c36e025e96ea3437de53d072d9 – < 2f1248b728b56d583ea454fedf239550c49f7b18
- affected b14d032973d4e6c36e025e96ea3437de53d072d9 – < 7469b3585ef5f65840d467d2caa811a9098c84b9
- affected b14d032973d4e6c36e025e96ea3437de53d072d9 – < 25132363c723afc39aace8b098f547ab4a0ea759
- affected 6.12
- unaffected < 6.12
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/0c0cf2240bb5ca5704ea932ba66ee54f43173915 (opens in a new tab)
- https://git.kernel.org/stable/c/2f1248b728b56d583ea454fedf239550c49f7b18 (opens in a new tab)
- https://git.kernel.org/stable/c/7469b3585ef5f65840d467d2caa811a9098c84b9 (opens in a new tab)
- https://git.kernel.org/stable/c/25132363c723afc39aace8b098f547ab4a0ea759 (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-2026-111911 (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-2026-99159)Record last updated .