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CVE-2021-47506: Linux

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning.

Засегнати продукти

  • Linux Linux: dff1399f8addf7129c49bb2227469da79cc30b47 преди 04a8d07f3d58308b92630045560799a3faa3ebce; dff1399f8addf7129c49bb2227469da79cc30b47 преди 348714018139c39533c55661a0c7c990671396b4; dff1399f8addf7129c49bb2227469da79cc30b47 преди 33645d3e22720cac1e4548f8fef57bf0649536ee; dff1399f8addf7129c49bb2227469da79cc30b47 преди 2becaa990b93cbd2928292c0b669d3abb6cf06d4; dff1399f8addf7129c49bb2227469da79cc30b47 преди e0759696de6851d7536efddfdd2dfed4c4df1f09; dff1399f8addf7129c49bb2227469da79cc30b47 преди eeb0711801f5e19ef654371b627682aed3b11373; dff1399f8addf7129c49bb2227469da79cc30b47 преди 148c816f10fd11df27ca6a9b3238cdd42fa72cd3; dff1399f8addf7129c49bb2227469da79cc30b47 преди 548ec0805c399c65ed66c6641be467f717833ab5
  • Linux Linux: 3.17; преди 3.17; 4.4.296 до 4.4.*; 4.9.294 до 4.9.*; 4.14.259 до 4.14.*; 4.19.222 до 4.19.*; 5.4.168 до 5.4.*; 5.10.85 до 5.10.*; 5.15.8 до 5.15.*; 5.16 до *

История

  • 24 май 2024 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2021-47506: Linux | freedomonline.bg