Riskcovery

CVE-2026-68385

s390/checksum: Fix csum_partial() without vector facility

State
Published
Severity
9.8 Critical
Published
Aug 10, 2026
Updated
Oct 19, 2026
Reserved
Jul 30, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

s390/checksum: Fix csum_partial() without vector facility

Currently csum_partial() calls csum_copy() with copy=false and dst=NULL. On machines without the vector facility, csum_copy() falls back to cksm(dst, ...), causing the checksum to be calculated from address zero instead of the source buffer.

The VX implementation already checksums data loaded from src. Make the fallback do the same by passing src to cksm().

Scores

CVSSScoreVectorSource
3.19.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • dcd3e1de9d17dc43dfed87a9fc814b9dec508043 to before 5fc0a2a6eeb99cac991242bb48796c7749ce3261Affected
  • dcd3e1de9d17dc43dfed87a9fc814b9dec508043 to before 1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722Affected
  • dcd3e1de9d17dc43dfed87a9fc814b9dec508043 to before 898bb2814f38399108bdd2113f38d97383a7036aAffected
  • dcd3e1de9d17dc43dfed87a9fc814b9dec508043 to before 4bb06b60d982355e22647b3d12d6619419f8c1faAffected
LinuxLinux
  • 6.9Affected
  • before 6.9Not affected
  • 6.12.101 through 6.12.*Not affected
  • 6.18.42 through 6.18.*Not affected
  • 7.1.6 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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