CVE-2026-80550s390/vfio_ccw: Fix out of bounds check on CCW array
- 7.9HighCVSS base score
- 0.14%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: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccwchain_calc_length() counts the number of channel command words (CCWs) that are chained together in a single channel program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs. The loop itself is "do..while (count < 257)", and while the logic in is_cpa_within_range() correctly adjusts between the 0-index array of CCWs and the count of CCWs starting at 1, this means it would look at a possible 257th CCW before ending the loop and (correctly) returning an error. Fix this by restructuring the loop to break as soon as 256 CCWs (thus indexes 0-255) are examined, without looking at memory outside the range.
Timeline
ID reserved
By Linux
Published
- 51 days later
· 51 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 | High7.9 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L |
| NVDNVD · Received | 3.1 | High7.9 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.9.
Affected products
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < 0282fb1c4b638eecfe2cc558092c460911d8f7e2
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < 907adc667d902fafbdb2d740d57b55bd025dc4cd
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < af3f80ca4c8b17f20f9e588def076288fdb49e65
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < 499a8a66b1598bfab97182aed15e0f1646074a3d
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < d5d096cd9369e986d4e5153baa86b8b35c283e09
- affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c – < a005b7f1a491ffda61bff0fd0f6548f8986fb977
- affected 4.12
- unaffected < 4.12
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.217 – ≤ 5.15.*
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.105 – ≤ 6.12.*
- unaffected 6.18.46 – ≤ 6.18.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2 (opens in a new tab)
- https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd (opens in a new tab)
- https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3 (opens in a new tab)
- https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65 (opens in a new tab)
- https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d (opens in a new tab)
- https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb (opens in a new tab)
- https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09 (opens in a new tab)
- https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977 (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-2026-66465 (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-2026-80550)Record last updated .