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CVE-2022-50093

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.3%
Linux•Linux•Versions : <0b4c0003aeda32a600f95df53b2848da8a5aa3fa, 0, 5.19.2, <=5.10.*, <5659efdadf04b56707d58c1b758df16d2e0eff2c, 6.0, 5.10.137, 5.4.211, <=5.18.*, <2.6.33, <=5.4.*, 2.6.33, 5.15.61, <b12304984654d8e58a2b22ff94c4410906d6267f, <b0b0b77ea611e3088e9523e60860f4f41b62b235, 5.18.18, <c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa, <=*, ee34b32d8c2950f66038c8975747ef9aec855289, <=5.15.*, <73ce2046e04ad488cecc66757c36cbe1bdf089d4, <=5.19.*

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE) KASAN reports: [ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) [ 4.676149][ T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0 [ 4.683454][ T0] [ 4.685638][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1 [ 4.694331][ T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016 [ 4.703196][ T0] Call Trace: [ 4.706334][ T0] <TASK> [ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) after converting the type of the first argument (@nr, bit number) of arch_test_bit() from `long` to `unsigned long`[0]. Under certain conditions (for example, when ACPI NUMA is disabled via command line), pxm_to_node() can return %NUMA_NO_NODE (-1). It is valid 'magic' number of NUMA node, but not valid bit number to use in bitops. node_online() eventually descends to test_bit() without checking for the input, assuming it's on caller side (which might be good for perf-critical tasks). There, -1 becomes %ULONG_MAX which leads to an insane array index when calculating bit position in memory. For now, add an explicit check for @node being not %NUMA_NO_NODE before calling test_bit(). The actual logics didn't change here at all. [0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d

Gravité et risque d'exploitation

CVE-2022-50093 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 15.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <0b4c0003aeda32a600f95df53b2848da8a5aa3fa, 0, 5.19.2, <=5.10.*, <5659efdadf04b56707d58c1b758df16d2e0eff2c, 6.0, 5.10.137, 5.4.211, <=5.18.*, <2.6.33, <=5.4.*, 2.6.33, 5.15.61, <b12304984654d8e58a2b22ff94c4410906d6267f, <b0b0b77ea611e3088e9523e60860f4f41b62b235, 5.18.18, <c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa, <=*, ee34b32d8c2950f66038c8975747ef9aec855289, <=5.15.*, <73ce2046e04ad488cecc66757c36cbe1bdf089d4, <=5.19.*) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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