CVE-2026-64402coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer()
- 7.8HighCVSS 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: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages normalization is only applied after the first loop iteration. This leaves the initial page index underived from the buffer size, which can result in an out-of-bounds write past dst_pages[] when head exceeds the AUX buffer size. Normalize head modulo the AUX buffer size before deriving the page index and offset, mirroring tmc_etr_sync_perf_buffer().
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 23 days later
· 23 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 06f5c2926aaa0fba7f99678da6ef77cbbbda1441 – < 38dbc8db8341ccdf8e1e1a067453d33ad751864b
- affected 06f5c2926aaa0fba7f99678da6ef77cbbbda1441 – < 4c5a0a946373da99a80398289b28845b5ae40cd1
- affected 06f5c2926aaa0fba7f99678da6ef77cbbbda1441 – < 661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb
- affected 06f5c2926aaa0fba7f99678da6ef77cbbbda1441 – < daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f
- affected 06f5c2926aaa0fba7f99678da6ef77cbbbda1441 – < 98495b5a4d77dd22e106f462b76e1093a55b29a7
- affected 6.3
- unaffected < 6.3
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/38dbc8db8341ccdf8e1e1a067453d33ad751864b (opens in a new tab)
- https://git.kernel.org/stable/c/4c5a0a946373da99a80398289b28845b5ae40cd1 (opens in a new tab)
- https://git.kernel.org/stable/c/661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb (opens in a new tab)
- https://git.kernel.org/stable/c/daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f (opens in a new tab)
- https://git.kernel.org/stable/c/98495b5a4d77dd22e106f462b76e1093a55b29a7 (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-2026-48946 (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-2026-64402)Record last updated .