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: perf/core: Fix refcount bug and potential UAF in perf_mmap Syzkaller reported a refcount_t: addition on 0; use-after-free warning in perf_mmap. The issue is caused by a race condition between a failing mmap() setup and a concurrent mmap() on a dependent event (e.g., using output redirection). In perf_mmap(), the ring_buffer (rb) is allocated and assigned to event->rb with the mmap_mutex held. The mutex is then released to perform map_range(). If map_range() fails, perf_mmap_close() is called to clean up. However, since the mutex was dropped, another thread attaching to this event (via inherited events or output redirection) can acquire the mutex, observe the valid event->rb pointer, and attempt to increment its reference count. If the cleanup path has already dropped the reference count to zero, this results in a use-after-free or refcount saturation warning. Fix this by extending the scope of mmap_mutex to cover the map_range() call. This ensures that the ring buffer initialization and mapping (or cleanup on failure) happens atomically effectively, preventing other threads from accessing a half-initialized or dying ring buffer.
Засегнати продукти
- Linux Linux: b709eb872e19a19607bbb6d2975bc264d59735cf преди c27dea9f50ed525facb62ef647dddc4722456e07; b709eb872e19a19607bbb6d2975bc264d59735cf преди ac7ecb65af170a7fc193e7bd8be15dac84ec6a56; b709eb872e19a19607bbb6d2975bc264d59735cf преди 77de62ad3de3967818c3dbe656b7336ebee461d2
- Linux Linux: 6.14; преди 6.14; 6.18.17 до 6.18.*; 6.19.7 до 6.19.*; от 7.0 нататък
Вид слабост
История
- 18 март 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-23248
- https://nvd.nist.gov/vuln/detail/CVE-2026-23248
- https://git.kernel.org/stable/c/c27dea9f50ed525facb62ef647dddc4722456e07
- https://git.kernel.org/stable/c/ac7ecb65af170a7fc193e7bd8be15dac84ec6a56
- https://git.kernel.org/stable/c/77de62ad3de3967818c3dbe656b7336ebee461d2