Incorrect calculation in Linux kernel - CVE-2026-63926
Published: July 20, 2026
Vulnerability identifier: #VU138731
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63926
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper offset calculation in bpf_msg_push_data() in the sockmap BPF subsystem when inserting data into the middle of a scatterlist entry. A local user can trigger the inconsistent split layout to cause a denial of service.
Exploitation requires access to BPF sockmap functionality.
How to mitigate CVE-2026-63926
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1
- https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b
- https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346
- https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d
- https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94
- https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2
- https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251
- https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f