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CVE-2026-74321: Linux

7.5

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 може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs() In the beginning of the loop, we try to obtain a locked delayed ref head, if 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(), which can return an error pointer. If the error pointer is -EAGAIN we do a continue and go back to the beginning of the loop, which will not try again to call btrfs_select_ref_head() since 'locked_ref' is no longer NULL but it's ERR_PTR(-EAGAIN), and then we do: spin_lock(&locked_ref->lock); against a ERR_PTR(-EAGAIN) value, generating an invalid pointer dereference. Fix this by ensuring that 'locked_ref' is set to NULL when btrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count' as well, to prevent infinite looping. We do this by doing a goto to the bottom of the loop that already sets 'locked_ref' to NULL and does a cond_resched(), with an increment to 'count' right before the goto. These measures were in place before the refactoring in commit 0110a4c43451 ("btrfs: refactor __btrfs_run_delayed_refs loop") but were unintentionally lost afterwards.

Засегнати продукти

  • Linux Linux: 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди c372ca227e16bace86f1df1fa4ae6849e2fcfa28; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди a71143590ce9764dbcb47617647592ff8b4d48bc; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди 65770111a2d47c2b15e20b2ba92bb12198f289d4; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди 015dc4a1e0c2cba551d4620eba13d26d5081dc34; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди ba9fa2ff5981589bb49094d3358c339b37c47f53; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди 3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди 9faa6b69ad73f03c7bde53e07d75a28822dc9a1a; 0110a4c43451533de1ea1bbdc57b5d452f9d8b25 преди 486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae
  • Linux Linux: 4.20; преди 4.20; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74321: Linux | freedomonline.bg