PT-2026-27748 · Linux · Linux Kernel
Published
2026-01-01
·
Updated
2026-05-22
·
CVE-2026-23383
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw related to the BPF JIT allocator. The allocator requests 4-byte alignment for the JIT buffer, but the
bpf plt structure contains a 64-bit (u64) target field. This can lead to misaligned access warnings and, more critically, a torn read during concurrent updates to the target field via WRITE ONCE() in bpf arch text poke() while the JIT'd code executes ldr. This occurs because 64-bit loads and stores on arm64 are only guaranteed to be atomic if 64-bit aligned. A misaligned target risks a jump to a corrupted address. The issue stems from failing to ensure the target lands on an 8-byte boundary due to incorrect padding logic in build plt().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