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CVE

CVE-2026-68385

s390/checksum: Fix csum_partial() without vector facility
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CVE

CVE-2026-68385

s390/checksum: Fix csum_partial() without vector facility

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

s390/checksum: Fix csum_partial() without vector facility

Currently csumpartial() calls csumcopy() 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().

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722, https://git.kernel.org/stable/c/4bb06b60d982355e22647b3d12d6619419f8c1fa, https://git.kernel.org/stable/c/5fc0a2a6eeb99cac991242bb48796c7749ce3261, https://git.kernel.org/stable/c/898bb2814f38399108bdd2113f38d97383a7036a, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68385.json, https://nvd.nist.gov/vuln/detail/CVE-2026-68385, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00491%
EPSS Percentile
0.4007%
Introduced Version
dcd3e1de9d17dc43dfed87a9fc814b9dec508043,6.9.0,6.13.0,6.19.0,0
Fix Available
4bb06b60d982355e22647b3d12d6619419f8c1fa,6.12.101,6.18.42,7.1.6,6.12.101-1~deb12u1,6.12.101-1

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