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: fscrypt: Add missing superblock check in find_or_insert_direct_key() The legacy 'fscrypt_direct_keys' table caches master keys that are used by v1 encryption policies that have FSCRYPT_POLICY_FLAG_DIRECT_KEY. It's just a global table for all filesystems (since the keys can be provided by the legacy process-subscribed keyrings mechanism, which makes it difficult to reuse super_block::s_master_keys). The entries in it ('struct fscrypt_direct_key') do contain a super_block pointer, though, for passing to fscrypt_destroy_inline_crypt_key() when the last inode that references the key is evicted. However, when finding the fscrypt_direct_key for an inode, we weren't actually comparing the super_block pointer. As a result, inodes with different super_blocks could point to the same fscrypt_direct_key. That could extend the lifetime of a fscrypt_direct_key beyond the super_block it points to, causing a use-after-free later. Fix this by creating distinct fscrypt_direct_key structs for distinct super_block structs. Note that this problem doesn't exist in the v2 policy equivalent ("per-mode keys"), since the data structures there are per super_block.
Засегнати продукти
- Linux Linux: 22e9947a4b2ba255888541bd0111cf00b9b16586 преди 965b5bc8cf5031225e057979ce660fec2bd5fbfc; 22e9947a4b2ba255888541bd0111cf00b9b16586 преди 330249609b70778094a7a36f5b6bcfa6362121d4; 22e9947a4b2ba255888541bd0111cf00b9b16586 преди deff41898a5ae3a47db5fa1896a494aa95efda5d; 22e9947a4b2ba255888541bd0111cf00b9b16586 преди 95376fe9c145be35566991df99c53134943d992f; 22e9947a4b2ba255888541bd0111cf00b9b16586 преди 466f187b501a5ac8e1ea2ccf3ccd5c46108d8830; 22e9947a4b2ba255888541bd0111cf00b9b16586 преди b5fa40226e71c17847b9ff2816c6ca4133d0d994
- Linux Linux: 6.1; преди 6.1; 6.1.183 до 6.1.*; 6.6.148 до 6.6.*; 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
- 10 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-68148
- https://nvd.nist.gov/vuln/detail/CVE-2026-68148
- https://git.kernel.org/stable/c/965b5bc8cf5031225e057979ce660fec2bd5fbfc
- https://git.kernel.org/stable/c/330249609b70778094a7a36f5b6bcfa6362121d4
- https://git.kernel.org/stable/c/deff41898a5ae3a47db5fa1896a494aa95efda5d
- https://git.kernel.org/stable/c/95376fe9c145be35566991df99c53134943d992f
- https://git.kernel.org/stable/c/466f187b501a5ac8e1ea2ccf3ccd5c46108d8830
- https://git.kernel.org/stable/c/b5fa40226e71c17847b9ff2816c6ca4133d0d994