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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:LAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < 0282fb1c4b638eecfe2cc558092c460911d8f7e2; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < 907adc667d902fafbdb2d740d57b55bd025dc4cd; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < af3f80ca4c8b17f20f9e588def076288fdb49e65; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < 499a8a66b1598bfab97182aed15e0f1646074a3d; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < d5d096cd9369e986d4e5153baa86b8b35c283e09; >= 0a19e61e6d4c6192077ead760ba0a2d350987d4c, < a005b7f1a491ffda61bff0fd0f6548f8986fb977 |
| Linux | Linux | 4.12 |
References
- https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2
- https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d
- https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb
- https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd
- https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977
- https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65
- https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09
- https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3
Timeline
- Published
- Aug 26, 2026
- Last modified
- Oct 16, 2026
- NVD status
- Received