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: ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() In the drain loop, the local variable 'runtime' is reassigned to a linked stream's runtime (runtime = s->runtime at line 2157). After releasing the stream lock at line 2169, the code accesses runtime->no_period_wakeup, runtime->rate, and runtime->buffer_size (lines 2170-2178) — all referencing the linked stream's runtime without any lock or refcount protecting its lifetime. A concurrent close() on the linked stream's fd triggers snd_pcm_release_substream() → snd_pcm_drop() → pcm_release_private() → snd_pcm_unlink() → snd_pcm_detach_substream() → kfree(runtime). No synchronization prevents kfree(runtime) from completing while the drain path dereferences the stale pointer. Fix by caching the needed runtime fields (no_period_wakeup, rate, buffer_size) into local variables while still holding the stream lock, and using the cached values after the lock is released.
Засегнати продукти
- Linux Linux: f2b3614cefb61ee6046a0aaee503ee37f227d310 преди 9baee36e8c5443411c4629afabafaff8a46a23fd; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди fc71f888994569f87d5bee20b1ac6c9c1e3a7a79; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди 629cf09464cf98670996ea5c191dc9743e6f3f00; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди 4a758e9a1f5ed722f83c4dd35f867fe811553bcb; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694; f2b3614cefb61ee6046a0aaee503ee37f227d310 преди 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6
- Linux Linux: 3.0; преди 3.0; 5.10.253 до 5.10.*; 5.15.220 до 5.15.*; 6.1.167 до 6.1.*; 6.6.130 до 6.6.*; 6.12.78 до 6.12.*; 6.18.19 до 6.18.*; 6.19.9 до 6.19.*; от 7.0 нататък
Вид слабост
История
- 8 май 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-43437
- https://nvd.nist.gov/vuln/detail/CVE-2026-43437
- https://git.kernel.org/stable/c/9baee36e8c5443411c4629afabafaff8a46a23fd
- https://git.kernel.org/stable/c/f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1
- https://git.kernel.org/stable/c/fc71f888994569f87d5bee20b1ac6c9c1e3a7a79
- https://git.kernel.org/stable/c/629cf09464cf98670996ea5c191dc9743e6f3f00
- https://git.kernel.org/stable/c/ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432
- https://git.kernel.org/stable/c/4a758e9a1f5ed722f83c4dd35f867fe811553bcb
- https://git.kernel.org/stable/c/c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694
- https://git.kernel.org/stable/c/9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6