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: fhandle: reject detached mounts in capable_wrt_mount() The recent fhandle RCU fix moved the mount namespace capability check into capable_wrt_mount(), so a non-NULL mnt_namespace survives the ns_capable() dereference. The helper still assumes the later READ_ONCE(mount->mnt_ns) must be non-NULL because may_decode_fh() checked is_mounted() first. That assumption is not stable. A detached mount from open_tree(..., OPEN_TREE_CLONE) can be dissolved on fput while open_by_handle_at() is between those checks, and umount_tree() can clear mount->mnt_ns. If the helper observes NULL, it dereferences mnt_ns->user_ns and panics. Return false when the RCU read observes a detached mount. This keeps the relaxed permission path conservative: a mount no longer attached to a namespace cannot authorize open_by_handle_at() access.
Засегнати продукти
- Linux Linux: 620c266f394932e5decc4b34683a75dfc59dc2f4 преди 15104234c267ebe04b9f9a73e5c2179cc265ff60; 620c266f394932e5decc4b34683a75dfc59dc2f4 преди 6c52226072a3c61337b1eec1799bb987748884fa; 620c266f394932e5decc4b34683a75dfc59dc2f4 преди 6ee183d89261bf1d1cf9f06d80a40dab8f36ee55; 620c266f394932e5decc4b34683a75dfc59dc2f4 преди 6c732471740bc2ac9b0946134f9f551dc75f4369
- Linux Linux: 6.11; преди 6.11; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; 7.2 до *
Вид слабост
История
- 15 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-72034
- https://nvd.nist.gov/vuln/detail/CVE-2026-72034
- https://git.kernel.org/stable/c/15104234c267ebe04b9f9a73e5c2179cc265ff60
- https://git.kernel.org/stable/c/6c52226072a3c61337b1eec1799bb987748884fa
- https://git.kernel.org/stable/c/6ee183d89261bf1d1cf9f06d80a40dab8f36ee55
- https://git.kernel.org/stable/c/6c732471740bc2ac9b0946134f9f551dc75f4369