Answer in brief
CVE-2026-80550 records a Unknown severity vulnerability in s390/vfio_ccw: Fix out of bounds check on CCW array. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <0282fb1c4b638eecfe2cc558092c460911d8f7e2 || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <907adc667d902fafbdb2d740d57b55bd025dc4cd || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3 || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <af3f80ca4c8b17f20f9e588def076288fdb49e65 || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <499a8a66b1598bfab97182aed15e0f1646074a3d || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <4c2e1d359d7a2b82cdf3254e4e480af9417f99fb || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <d5d096cd9369e986d4e5153baa86b8b35c283e09 || >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <a005b7f1a491ffda61bff0fd0f6548f8986fb977 | 0282fb1c4b638eecfe2cc558092c460911d8f7e2, 907adc667d902fafbdb2d740d57b55bd025dc4cd, f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3, af3f80ca4c8b17f20f9e588def076288fdb49e65, 499a8a66b1598bfab97182aed15e0f1646074a3d, 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb, d5d096cd9369e986d4e5153baa86b8b35c283e09, a005b7f1a491ffda61bff0fd0f6548f8986fb977 |
| Linux/Linuxgeneric | 4.12 | Not reported |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.