by Kastro
Paper/Archive/CVE-2026-68385

CVE-2026-68385

Linux Linux — s390/checksum: Fix csum_partial() without vector facility

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 42.1.421 × 208.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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().

Affected

ProductAffectedFixed inSource
Linuxdcd3e1de9d17dc43dfed87a9fc814b9dec508043 – < 5fc0a2a6eeb99cac991242bb48796c7749ce32615fc0a2a6eeb99cac991242bb48796c7749ce3261CNA
Linuxdcd3e1de9d17dc43dfed87a9fc814b9dec508043 – < 1d9a2f01b3c4e5c88e06b2db4b5460c2ec8847221d9a2f01b3c4e5c88e06b2db4b5460c2ec884722CNA
Linuxdcd3e1de9d17dc43dfed87a9fc814b9dec508043 – < 898bb2814f38399108bdd2113f38d97383a7036a898bb2814f38399108bdd2113f38d97383a7036aCNA
Linuxdcd3e1de9d17dc43dfed87a9fc814b9dec508043 – < 4bb06b60d982355e22647b3d12d6619419f8c1fa4bb06b60d982355e22647b3d12d6619419f8c1faCNA
Linux6.96.12.101CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/5fc0a2a6eeb99cac991242bb48796c7749ce3261refgit.kernel.org/stable/c/1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722refgit.kernel.org/stable/c/898bb2814f38399108bdd2113f38d97383a7036arefgit.kernel.org/stable/c/4bb06b60d982355e22647b3d12d6619419f8c1fa