- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% 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: ACPI: pfr_update: fix stack buffer overflow in query_capability() query_capability() copies four ACPI buffer objects returned by the firmware _DSM into fixed-size u8[16] fields in struct pfru_update_cap_info using memcpy with the firmware-supplied length: memcpy(&cap_hdr->code_type, elements[CAP_CODE_TYPE_IDX].buffer.pointer, elements[CAP_CODE_TYPE_IDX].buffer.length); The same pattern repeats for drv_type, platform_id, and oem_id. If the firmware returns buffer.length > 16 for any of these fields, memcpy writes past the destination array. struct pfru_update_cap_info is stack-allocated in pfru_ioctl(). Confirmed with KASAN on 7.2-rc6: three stack-out-of-bounds reports are generated when a DSM returns 64-byte buffers, with writes reaching 44 bytes past the end of cap_hdr's [64, 156) frame window into adjacent stack redzones. Introduce a helper pointer to out_obj->package.elements and use it to validate each buffer length against its destination field size before copying, returning -EINVAL if the firmware supplies an oversized buffer.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 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 · Received | 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)
- 0.14% · top 96% of all CVEs (12 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 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < d3af83e327565a9444cebc0db714cb837e493046
- affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < c5a31b4e7e37c92550be9a2edf51ca853a4d251a
- affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < a2151624b55029dad0ca7efd17fb83a0461c8843
- affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < 6d4ed2fd022bc862b156e53aae163b61259e1caa
- affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < 15d2b7f38f95d28652170344f39ee492c55e567c
- affected 0db89fa243e5edc5de38c88b369e4c3755c5fb74 – < ced45be0073a8a31b30b4a7f68cd3a15734515de
- affected 5.17
- unaffected < 5.17
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/d3af83e327565a9444cebc0db714cb837e493046 (opens in a new tab)
- https://git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a (opens in a new tab)
- https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843 (opens in a new tab)
- https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa (opens in a new tab)
- https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c (opens in a new tab)
- https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de (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-2026-76499 (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-2026-89587)Record last updated .