CVE-2023-54086 | THREATINT

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Add preempt_count_{sub,add} into btf id deny list The recursion check in __bpf_prog_enter* and __bpf_prog_exit* leave preempt_count_{sub,add} unprotected. When attaching trampoline to them we get panic as follows, [ 867.843050] BUG: TASK stack guard page was hit at 0000000009d325cf (stack is 0000000046a46a15..00000000537e7b28) [ 867.843064] stack guard page: 0000 [#1] PREEMPT SMP NOPTI [ 867.843067] CPU: 8 PID: 11009 Comm: trace Kdump: loaded Not tainted 6.2.0+ #4 [ 867.843100] Call Trace: [ 867.843101] <TASK> [ 867.843104] asm_exc_int3+0x3a/0x40 [ 867.843108] RIP: 0010:preempt_count_sub+0x1/0xa0 [ 867.843135] __bpf_prog_enter_recur+0x17/0x90 [ 867.843148] bpf_trampoline_6442468108_0+0x2e/0x1000 [ 867.843154] ? preempt_count_sub+0x1/0xa0 [ 867.843157] preempt_count_sub+0x5/0xa0 [ 867.843159] ? migrate_enable+0xac/0xf0 [ 867.843164] __bpf_prog_exit_recur+0x2d/0x40 [ 867.843168] bpf_trampoline_6442468108_0+0x55/0x1000 ... [ 867.843788] preempt_count_sub+0x5/0xa0 [ 867.843793] ? migrate_enable+0xac/0xf0 [ 867.843829] __bpf_prog_exit_recur+0x2d/0x40 [ 867.843837] BUG: IRQ stack guard page was hit at 0000000099bd8228 (stack is 00000000b23e2bc4..000000006d95af35) [ 867.843841] BUG: IRQ stack guard page was hit at 000000005ae07924 (stack is 00000000ffd69623..0000000014eb594c) [ 867.843843] BUG: IRQ stack guard page was hit at 00000000028320f0 (stack is 00000000034b6438..0000000078d1bcec) [ 867.843842] bpf_trampoline_6442468108_0+0x55/0x1000 ... That is because in __bpf_prog_exit_recur, the preempt_count_{sub,add} are called after prog->active is decreased. Fixing this by adding these two functions into btf ids deny list.

PUBLISHED Reserved 2025-12-24 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Linux

Product status

Default status

unaffected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 095018267c87b8bfbbb12eeb1c0ebf2359e1782c

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 60039bf72f81638baa28652a11a68e9b0b7b5b2d

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before b9168d41b83d182f34ba927ee822edaee18d5fc8

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before c11bd046485d7bf1ca200db0e7d0bdc4bafdd395

affected

Default status

affected

5.15.113 (semver)

unaffected

6.1.30 (semver)

unaffected

6.3.4 (semver)

unaffected

6.4 (original_commit_for_fix)

unaffected

References

git.kernel.org/...c/095018267c87b8bfbbb12eeb1c0ebf2359e1782c

git.kernel.org/...c/60039bf72f81638baa28652a11a68e9b0b7b5b2d

git.kernel.org/...c/b9168d41b83d182f34ba927ee822edaee18d5fc8

git.kernel.org/...c/c11bd046485d7bf1ca200db0e7d0bdc4bafdd395

cve.org (CVE-2023-54086)

nvd.nist.gov (CVE-2023-54086)

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