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CVE-2026-80550

s390/vfio_ccw: Fix out of bounds check on CCW array

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 0282fb1c4b638eecfe2cc558092c460911d8f7e2; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 907adc667d902fafbdb2d740d57b55bd025dc4cd; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in af3f80ca4c8b17f20f9e588def076288fdb49e65; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 499a8a66b1598bfab97182aed15e0f1646074a3d; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in d5d096cd9369e986d4e5153baa86b8b35c283e09; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in a005b7f1a491ffda61bff0fd0f6548f8986fb977

  • Linux Linux

    4.12

  • KernelLinux

    From 4.12.0 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.153; From 6.7.0 · fixed in 6.12.105; From 6.13.0 · fixed in 6.18.46; From 6.19.0 · fixed in 7.1.10

References 8

git.kernel.org