# CVE-2023-54086: linux: In the Linux kernel, the following vulnerability has been resolved: bpf: Add preempt_count_{sub,add} into btf id den... CVE-2023-54086 is fixed in 20 products on 1 platform, first by ALAS2023-2023-228, released June 21, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-54086 - Priority: High - CVSS: n/a (important) - EPSS: 0.0021 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 21, 2023 ## 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] [ 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-headers amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-livepatch-6.1.34-56.100 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-54086](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54086.md) | Dec 24, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-54086](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54086.md) | Dec 24, 2025 | | Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-54086](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54086.md) | Dec 24, 2025 | | Linux | perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | --- Data as of 2026-11-08T06:59:42Z UTC. 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