CVEvulnerability
CVE-2026-98041
7.0 HIGH
Official page ↗
- Status
- Received
- Published
- 2026-09-25
- Last modified
- 2026-10-21
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Don't predict JMP32 pointer vs zero comparisons
Consider the following program:
r1 = map_value; /* low 32 bits are zero at runtime */
r6 = 0xdead000000000000;
if w1 != 0 goto l1;
l0: r1 += r6;
r2 = *(u64 *)(r1 + 0);
exit;
l1: r6 = 0;
goto l0;
At the moment is_branch_taken() reports the jump as always taken,
because it does not distinguish between BPF_JMP and BPF_JMP32
comparisons when processing 'if w1 != 0 ...'.
References
- https://git.kernel.org/stable/c/6e1544986536734166176c3add504add23bcbd15 git.kernel.org
- https://git.kernel.org/stable/c/a4d7f94c1ca914469ced665ec2f98be669aef462 git.kernel.org
- https://git.kernel.org/stable/c/d16f0eafcaa62e677a2b5b0dabc1f8d31dfe3d4d git.kernel.org
- https://git.kernel.org/stable/c/e2ae33247e8b2dbe9d116d3e61cadf6d548339c6 git.kernel.org
- https://git.kernel.org/stable/c/e51179a4e09846f8fd0f26a05068520de2b301bf git.kernel.org