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🛡️ CVE-2023-54086 — kernel

⚪ Unknown ✅ No Known Exploit NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

bpf: Add preempt_count_{sub,add} into btf id deny list

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.

Affected software

CVE-2023-54086 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.3.4)
  • unknown

Timeline and source

Published on 24 December 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-54086 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-24
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.3.4
unknown — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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