Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-08-15T00:00:00 kernel: ASoC: qcom: q6apm: fix NULL pointer dereference in graph_callback 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-476

In the Linux kernel, the following vulnerability has been resolved: ASoC: qcom: q6apm: fix NULL pointer dereference in graph_callback When q6apm_free_fragments() is called it frees rx_data.buf/tx_data.buf and sets them to NULL under graph->lock. A late DSP buffer-done response can race with this: graph_callback() passes the !graph->ar_graph guard (not yet NULL), acquires the lock, but then dereferences a now-NULL buf pointer to read buf[token].phys, crashing at virtual address 0x10. Add a NULL check for buf inside the mutex-protected section in both the write-done (DATA_CMD_RSP_WR_SH_MEM_EP_DATA_BUFFER_DONE_V2) and read-done (DATA_CMD_RSP_RD_SH_MEM_EP_DATA_BUFFER_V2) handlers and bail out cleanly if buffers have already been freed. This problem is only shown up recently while apr bus was updated to process the commands per service rather from single global queue.

A flaw was found in the Linux kernel's ASoC (Advanced Linux Sound Architecture System on Chip) qcom q6apm component. A race condition can occur when the q6apm_free_fragments() function frees audio buffers while graph_callback() attempts to access a freed buffer due to a late Digital Signal Processor (DSP) response. This can lead to a NULL pointer dereference, causing the system to crash and resulting in a Denial of Service (DoS).

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-72257 https://nvd.nist.gov/vuln/detail/CVE-2026-72257 https://lore.kernel.org/linux-cve-announce/2026081554-CVE-2026-72257-6572@gregkh/T