CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски 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: btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps When btrfs_drop_extent_map_range() splits an extent map, the new split maps inherit the original map's flags through a local 'flags' variable. Commit f86f7a75e2fb ("btrfs: use the flags of an extent map to identify the compression type") changed the EXTENT_FLAG_LOGGING clearing to operate on em->flags instead of that local 'flags' copy, so a split of an extent map that is currently being logged wrongly inherits EXTENT_FLAG_LOGGING. The flag is then never cleared on the split, and when it is freed while still on the inode's modified_extents list (for example by the extent map shrinker) it trips the WARN_ON(!list_empty(&em->list)) in btrfs_free_extent_map() and leads to a use-after-free. Clear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the splits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the behaviour prior to f86f7a75e2fb.
Засегнати продукти
- Linux Linux: f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 преди 2a9246a424f45f33a1b8367052611ebe874868ad; f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 преди 9304713b70e7e1450e3a76e758836fe5391bfa95; f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 преди 0e465c63f103a5ce6849614d6bda048d70eebec8; f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 преди 5eff4d5b17fa1950e80bfd1ba43dc0699e61a644
- Linux Linux: 6.8; преди 6.8; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък
Вид слабост
История
- 12 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-68442
- https://nvd.nist.gov/vuln/detail/CVE-2026-68442
- https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad
- https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95
- https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8
- https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644