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: xsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata() The TX metadata area resides in the UMEM buffer which is memory-mapped and concurrently writable by userspace. In xsk_skb_metadata(), csum_start and csum_offset are read from shared memory for bounds validation, then read again for skb assignment. A malicious userspace application can race to overwrite these values between the two reads, bypassing the bounds check and causing out-of-bounds memory access during checksum computation in the transmit path. Fix this by reading csum_start and csum_offset into local variables once, then using the local copies for both validation and assignment. Note that other metadata fields (flags, launch_time) and the cached csum fields may be mutually inconsistent due to concurrent userspace writes, but this is benign: the only security-critical invariant is that each field's validated value is the same one used, which local caching guarantees.
Засегнати продукти
- Linux Linux: 48eb03dd26304c24f03bdbb9382e89c8564e71df преди eb778aed8a9b2381668fcb1247ae4fa011224768; 48eb03dd26304c24f03bdbb9382e89c8564e71df преди 0dfe05b938435892875e07771170051346412df9; 48eb03dd26304c24f03bdbb9382e89c8564e71df преди bfdfd2706d5fb2cd496a1506e680daf979309c8b; 48eb03dd26304c24f03bdbb9382e89c8564e71df преди 22ba97ea9cc1f63a0d0244fae38057ed452b6ac7
- Linux Linux: 6.8; преди 6.8; 6.12.110 до 6.12.*; 6.18.36 до 6.18.*; 7.0.13 до 7.0.*; от 7.1 нататък
Вид слабост
История
- 25 юни 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-53250
- https://nvd.nist.gov/vuln/detail/CVE-2026-53250
- https://git.kernel.org/stable/c/eb778aed8a9b2381668fcb1247ae4fa011224768
- https://git.kernel.org/stable/c/0dfe05b938435892875e07771170051346412df9
- https://git.kernel.org/stable/c/bfdfd2706d5fb2cd496a1506e680daf979309c8b
- https://git.kernel.org/stable/c/22ba97ea9cc1f63a0d0244fae38057ed452b6ac7