Answer in brief
CVE-2026-43437 records a High severity (CVSS 7.8) vulnerability in ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <9baee36e8c5443411c4629afabafaff8a46a23fd || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <629cf09464cf98670996ea5c191dc9743e6f3f00 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <4a758e9a1f5ed722f83c4dd35f867fe811553bcb || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 | 9baee36e8c5443411c4629afabafaff8a46a23fd, fc71f888994569f87d5bee20b1ac6c9c1e3a7a79, 629cf09464cf98670996ea5c191dc9743e6f3f00, ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432, 4a758e9a1f5ed722f83c4dd35f867fe811553bcb, c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694, 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 |
| Linux/Linuxgeneric | 3.0 | Not reported |
| Linux/Linuxgeneric | >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <9baee36e8c5443411c4629afabafaff8a46a23fd || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <629cf09464cf98670996ea5c191dc9743e6f3f00 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <4a758e9a1f5ed722f83c4dd35f867fe811553bcb || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 || >=f2b3614cefb61ee6046a0aaee503ee37f227d310 <9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 | 9baee36e8c5443411c4629afabafaff8a46a23fd, f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1, fc71f888994569f87d5bee20b1ac6c9c1e3a7a79, 629cf09464cf98670996ea5c191dc9743e6f3f00, ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432, 4a758e9a1f5ed722f83c4dd35f867fe811553bcb, c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694, 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.