Critical severity · published Aug 10, 2026
CVE-2026-68385
s390/checksum: Fix csum_partial() without vector facility
9.8
CVSS
0.5%
EPSS
No
On KEV
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().
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
dcd3e1de9d17dc43dfed87a9fc814b9dec508043 before 5fc0a2a6eeb99cac991242bb48796c7749ce3261; dcd3e1de9d17dc43dfed87a9fc814b9dec508043 before 1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722; dcd3e1de9d17dc43dfed87a9fc814b9dec508043 before 898bb2814f38399108bdd2113f38d97383a7036a; dcd3e1de9d17dc43dfed87a9fc814b9dec508043 before 4bb06b60d982355e22647b3d12d6619419f8c1fa; 6.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-68385
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-68385
git.kernel.org
https://git.kernel.org/stable/c/1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722
git.kernel.org
https://git.kernel.org/stable/c/4bb06b60d982355e22647b3d12d6619419f8c1fa
git.kernel.org
https://git.kernel.org/stable/c/5fc0a2a6eeb99cac991242bb48796c7749ce3261
git.kernel.org
https://git.kernel.org/stable/c/898bb2814f38399108bdd2113f38d97383a7036a
More from Linux
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
7.8
CVE-2026-53362
ipv6: account for fraggap on the paged allocation path
7.8
CVE-2026-46300
net: skbuff: preserve shared-frag marker during coalescing
7.8
CVE-2026-31431
crypto: algif_aead - Revert to operating out-of-place