Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before 0282fb1c4b638eecfe2cc558092c460911d8f7e2; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before 907adc667d902fafbdb2d740d57b55bd025dc4cd; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before af3f80ca4c8b17f20f9e588def076288fdb49e65; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before 499a8a66b1598bfab97182aed15e0f1646074a3d; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before d5d096cd9369e986d4e5153baa86b8b35c283e09; affected 0a19e61e6d4c6192077ead760ba0a2d350987d4c before a005b7f1a491ffda61bff0fd0f6548f8986fb977 |
| Linux / Linux | affected 4.12; unaffected 0 before 4.12; unaffected 5.10.266 through 5.10.*; unaffected 5.15.217 through 5.15.*; unaffected 6.1.184 through 6.1.*; unaffected 6.6.153 through 6.6.*; unaffected 6.12.105 through 6.12.*; unaffected 6.18.46 through 6.18.*; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2
- https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd
- https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3
- https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65
- https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d
- https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb
- https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09
- https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977
ADP enrichment
No English description supplied.
No references supplied.