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CVE-2026-74572: 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: zoned: fix deadlock between metadata writeback and transaction commit When writing out metadata extent buffers in a zoned filesystem, btree_writepages() holds fs_info->zoned_meta_io_lock across the whole writeback loop, including the call to btrfs_check_meta_write_pointer() -> check_bg_is_active(). For the tree-log block group, check_bg_is_active() may fail to activate the zone and fall back to btrfs_zone_finish_one_bg() to free an active zone. That path waits for the running transaction to commit while still holding zoned_meta_io_lock, but the committer needs that same lock to write out the tree extents, so the two tasks deadlock: Task A (kworker, metadata writeback) Task B (fsstress, transaction commit) ------------------------------------ ------------------------------------- wb_workfn() btrfs_commit_transaction(T) btree_writepages() btrfs_write_and_wait_transaction() btrfs_zoned_meta_io_lock() btrfs_write_marked_extents() btrfs_check_meta_write_pointer() btree_writepages() check_bg_is_active() [treelog_bg] btrfs_zoned_meta_io_lock() btrfs_zone_finish_one_bg() <blocks on zoned_meta_io_lock, btrfs_zone_finish() held by Task A> do_zone_finish() btrfs_inc_block_group_ro() btrfs_wait_for_commit() <blocks waiting for commit of transaction T, done by Task B> The sibling branch in check_bg_is_active() already drops zoned_meta_io_lock around do_zone_finish() for this exact reason. Do the same in the tree-log branch: release the lock around btrfs_zone_finish_one_bg() and re-acquire it afterwards. The lock only protects fs_info->active_{meta,system}_bg, which this branch does not touch, and ctx->zoned_bg keeps a reference to the block group across the unlock, so nothing

Засегнати продукти

  • Linux Linux: 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 преди 18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcdd; 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 преди c3320873e0c04ce7b746fc8fe948f07bbbbdec33; 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 преди deddd28fd83c264ee2ff5cd6b34449a9f1be6112; 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 преди 75859a7cd77cd2ddaddbcb963e3fcd34738953af; 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 преди 1ebe51c29fa9755d5b2fea28727c051117907cf8; fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75; 6.5.5 преди 6.6
  • Linux Linux: 6.6; преди 6.6; 6.6.151 до 6.6.*; 6.12.103 до 6.12.*; 6.18.44 до 6.18.*; 7.1.8 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74572: Linux | freedomonline.bg