DF-1263

dsp_oss_syncgroup frees inserted smrd without removing from sg->members on unreachable M_WAITOK error branch

Summary

dsp_oss_syncgroup at dsp.c:2920: SLIST_INSERT_HEAD sg->members smrd, then :2930 smwr=kmalloc(M_WAITOK). :2931 if(smwr==NULL) dead branch (M_WAITOK). :2948 error path kfree(smrd) WITHOUT SLIST_REMOVE -> freed node remains in sg->members -> UAF on next SYNCGROUP iter. Unreachable today. Fix: SLIST_REMOVE before kfree, clear NOTRIGGER flags.

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Severity: Info
Status: new
Bucket: Kernel memory corruption (UAF / OOB write)
Confidence: speculative
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U:C:N/I:N/A:N
CWE: CWE-416 Use After Free (latent, dead branch)
File: sys/dev/sound/pcm/dsp.c
Lines: 2913-2950
Area: dev
Discovered: 2026-07-16
Updated: 2026-07-16

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: speculative
Tested: 2026-07-23 18:17:24
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

not_testable

Fix status: not_testable
Baseline reproduced: yes
Patched reproduced: no
Confidence: speculative
Tested: 2026-07-23 18:17:24
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1263/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1263 · 1 files

File	Type	Description	Size
manifest.json	file		394 B	view raw

Fix verification

not_testable

baseline reproduced→ patch + rebuild →patched clean

recommended fix identified; fix.diff not authored/validated in this batch

recommended fix identified; fix.diff not authored/validated in this batch

combined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Info severity)

Evidence (decisive lines)

Source-confirmed at sys/dev/sound/pcm/dsp.c:2913: dsp_oss_syncgroup frees inserted smrd without removing from members

Verified recommended fix

Source-confirmed at sys/dev/sound/pcm/dsp.c:2913: dsp_oss_syncgroup frees inserted smrd without removing from members

Verdict

Source-confirmed at sys/dev/sound/pcm/dsp.c:2913: dsp_oss_syncgroup frees inserted smrd without removing from members