CVE-2026-80550
CVE CVE-2026-80550EUVD EUVD-2026-66465Published 2026-08-26T14:37:19.000ZLast changed 2026-08-27T05:01:38.000ZCVSS 7.9
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 0a19e61e6d4c6192077ead760ba0a2d350987d4c <907adc667d902fafbdb2d740d57b55bd025dc4cd; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <d5d096cd9369e986d4e5153baa86b8b35c283e09; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <0282fb1c4b638eecfe2cc558092c460911d8f7e2; patch: 5.10.266; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3; patch: 7.2; patch: 7.1.10; patch: 5.15.217; patch: 6.6.153; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <499a8a66b1598bfab97182aed15e0f1646074a3d; patch: 6.1.184; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <af3f80ca4c8b17f20f9e588def076288fdb49e65; 4.12; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <4c2e1d359d7a2b82cdf3254e4e480af9417f99fb; patch: 6.12.105; patch: 0; 0a19e61e6d4c6192077ead760ba0a2d350987d4c <a005b7f1a491ffda61bff0fd0f6548f8986fb977; patch: 6.18.46
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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