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CVE-2024-42063 (GCVE-0-2024-42063)

Vulnerability from cvelistv5 – Published: 2024-07-29 15:52 – Updated: 2026-05-11 20:26
VLAI
Title
bpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:20 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd4cf0ed331a275e9bf5a49e6d0fd55dffc551b8 , < b30f3197a6cd080052d5d4973f9a6b479fd9fff5 (git)
Affected: bd4cf0ed331a275e9bf5a49e6d0fd55dffc551b8 , < d812ae6e02bd6e6a9cd1fdb09519c2f33e875faf (git)
Affected: bd4cf0ed331a275e9bf5a49e6d0fd55dffc551b8 , < 3189983c26108cf0990e5c46856dc9feb9470d12 (git)
Affected: bd4cf0ed331a275e9bf5a49e6d0fd55dffc551b8 , < e8742081db7d01f980c6161ae1e8a1dbc1e30979 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 6.1.97 , ≤ 6.1.* (semver)
Unaffected: 6.6.37 , ≤ 6.6.* (semver)
Unaffected: 6.9.8 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: marcar la pila de programas bpf con kmsan_unposion_memory en modo int\u00e9rprete syzbot inform\u00f3 usos de memoria uninit durante map_{lookup,delete}_elem. ========== ERROR: KMSAN: valor uninit en __dev_map_lookup_elem kernel/bpf/devmap.c:441 [en l\u00ednea] ERROR: KMSAN: valor uninit en dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap. c:796 __dev_map_lookup_elem kernel/bpf/devmap.c:441 [en l\u00ednea] dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [en l\u00ednea] 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 ========== El reproductor debe estar en el modo int\u00e9rprete. El reproductor de C est\u00e1 intentando ejecutar el siguiente programa bpf: 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) llamar a dev_map_lookup_elem#1543472 11: (95) salir Se debe a la \"clave * vac\u00eda\" (r2) pasada al ayudante. bpf permite el acceso a la memoria de pila uninit para el programa bpf con los privilegios correctos. Este parche usa kmsan_unpoison_memory() para marcar la pila como inicializada. Esto deber\u00eda abordar diferentes informes de syzbot sobre el argumento uninit \"void *key\" durante map_{lookup,delete}_elem."
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.