PT-2026-36426 · Linux+1 · Linux Kernel+1
CVE-2026-43009
·
Published
2026-05-01
·
Updated
2026-07-18
CVSS v4.0
8.5
High
| Vector | AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the Linux kernel eBPF verifier where the
backtrack insn function fails to correctly handle atomic fetch operations. When encountering a BPF STX instruction with BPF ATOMIC and BPF FETCH, the logic treats the source register as a regular input rather than recognizing it also acts as a destination for the old memory value. This prevents the propagation of precision to the stack location, causing the verifier's path pruning to incorrectly treat two different states as equivalent. This flaw can be exploited by privileged users to bypass security restrictions, including within Windows Subsystem for Linux (WSL).Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Linux Kernel
Windows Subsystem For Linux