# CVE-2024-42063: linux: In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf prog stack with kmsan_unposion_mem... CVE-2024-42063 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2024-42063, released July 29, 2024. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2024-42063 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0022 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 29, 2024 ## Description In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode syzbot reported uninit memory usages during map_{lookup,delete}_elem. ========== BUG: KMSAN: uninit-value in __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline] BUG: KMSAN: uninit-value in dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796 __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline] dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline] bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237 ========== The reproducer should be in the interpreter mode. The C reproducer is trying to run the following bpf prog: 0: (18) r0 = 0x0 2: (18) r1 = map[id:49] 4: (b7) r8 = 16777216 5: (7b) *(u64 *)(r10 -8) = r8 6: (bf) r2 = r10 7: (07) r2 += -229 ^^^^^^^^^^ 8: (b7) r3 = 8 9: (b7) r4 = 0 10: (85) call dev_map_lookup_elem#1543472 11: (95) exit It is due to the "void *key" (r2) passed to the helper. bpf allows uninit stack memory access for bpf prog with the right privileges. This patch uses kmsan_unpoison_memory() to mark the stack as initialized. This should address different syzbot reports on the uninit "void *key" argument during map_{lookup,delete}_elem. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-debuginfo amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-devel amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-headers amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-libbpf amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-livepatch-6.1.97-104.177 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-modules-extra amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-modules-extra-common amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-tools amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | kernel-tools-devel amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | linux Debian 12.15 (bookworm) | 6.1.98-1 | [DEBIAN-CVE-2024-42063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42063.md) | Jul 29, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.9.8-1 | [DEBIAN-CVE-2024-42063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42063.md) | Jul 29, 2024 | | Linux | linux Debian 14 | 6.9.8-1 | [DEBIAN-CVE-2024-42063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42063.md) | Jul 29, 2024 | | Linux | perf amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | perf-debuginfo amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | python3-perf amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.97-104.177.amzn2023 | [ALAS2023-2024-714](https://patchblox.com/security/data/fix/linux/alas2023-2024-714.md) | Sep 12, 2024 | --- Data as of 2026-11-09T01:18:40Z UTC. 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