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CVE-2021-46959

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=5.11.*, 5e844cc37a5cbaa460e68f9a989d321d63088a89, 4.19.163, 4.14.233, 4.9.271, <4.4.271, <4.19.191, 0, 4.9.248, 5.4.80, <5.4.119, <=4.9.*, 0870525cf94bc27907e94ce99afb6d7239ffd2f5, 4.4.271, <62bb2c7f2411a0045c24831f11ecacfc35610815, a4add022c1552b0d51a0b89a4781919d6ebac4f9, <=4.14.*, <=5.10.*, 5.10.37, 4.4.248, <4.9.271, 4.14.212, 5.11.21, <8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e, <c7fabe372a9031acd00498bc718ce27c253abfd1, <794aaf01444d4e765e2b067cba01cc69c1c68ed9, 8c45a1c6c951bbe7f95db78fcab46f7337364468, bd1a5b2307279029faaddbecf2f2ac25eaef8dc6, 5.9.11, <001c8e83646ad3b847b18f6ac55a54367d917d74, <=5.4.*, <4.14.233, 5.13, <5.10, <=4.19.*, <=5.12.*, 5.12.4, <28a5529068c51cdf0295ab1e11a99a3a909a03e4, 5.4.119, 4.19.191, <=4.4.*, <=*, 3e04a4976addbedcad326f47b0dd4efc570a1fac, <8e029707f50a82c53172359c686b2536ab54e58c, <8735248ebb918d25427965f0db07939ed0473ec6, <cee78aa24578edac8cf00513dca618c0acc17cd7, 5.10, 234b432c7b6184b2d6c5ba2c55f0dd5023c0edf0

Description

In the Linux kernel, the following vulnerability has been resolved: spi: Fix use-after-free with devm_spi_alloc_* We can't rely on the contents of the devres list during spi_unregister_controller(), as the list is already torn down at the time we perform devres_find() for devm_spi_release_controller. This causes devices registered with devm_spi_alloc_{master,slave}() to be mistakenly identified as legacy, non-devm managed devices and have their reference counters decremented below 0. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98) [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24) r4:b6700140 [<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40) [<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (device_driver_detach) from [<b044d274>] (unbind_store+0xe4/0xf8) Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.

Gravité et risque d'exploitation

CVE-2021-46959 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 0.24 %, ce qui la place devant 14.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=5.11.*, 5e844cc37a5cbaa460e68f9a989d321d63088a89, 4.19.163, 4.14.233, 4.9.271, <4.4.271, <4.19.191, 0, 4.9.248, 5.4.80, <5.4.119, <=4.9.*, 0870525cf94bc27907e94ce99afb6d7239ffd2f5, 4.4.271, <62bb2c7f2411a0045c24831f11ecacfc35610815, a4add022c1552b0d51a0b89a4781919d6ebac4f9, <=4.14.*, <=5.10.*, 5.10.37, 4.4.248, <4.9.271, 4.14.212, 5.11.21, <8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e, <c7fabe372a9031acd00498bc718ce27c253abfd1, <794aaf01444d4e765e2b067cba01cc69c1c68ed9, 8c45a1c6c951bbe7f95db78fcab46f7337364468, bd1a5b2307279029faaddbecf2f2ac25eaef8dc6, 5.9.11, <001c8e83646ad3b847b18f6ac55a54367d917d74, <=5.4.*, <4.14.233, 5.13, <5.10, <=4.19.*, <=5.12.*, 5.12.4, <28a5529068c51cdf0295ab1e11a99a3a909a03e4, 5.4.119, 4.19.191, <=4.4.*, <=*, 3e04a4976addbedcad326f47b0dd4efc570a1fac, <8e029707f50a82c53172359c686b2536ab54e58c, <8735248ebb918d25427965f0db07939ed0473ec6, <cee78aa24578edac8cf00513dca618c0acc17cd7, 5.10, 234b432c7b6184b2d6c5ba2c55f0dd5023c0edf0) 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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