CVE-2023-53275
ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync()
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync() The variable codec->regmap is often protected by the lock codec->regmap_lock when is accessed. However, it is accessed without holding the lock when is accessed in snd_hdac_regmap_sync(): if (codec->regmap) In my opinion, this may be a harmful race, because if codec->regmap is set to NULL right after the condition is checked, a null-pointer dereference can occur in the called function regcache_sync(): map->lock(map->lock_arg); --> Line 360 in drivers/base/regmap/regcache.c To fix this possible null-pointer dereference caused by data race, the mutex_lock coverage is extended to protect the if statement as well as the function call to regcache_sync(). [ Note: the lack of the regmap_lock itself is harmless for the current codec driver implementations, as snd_hdac_regmap_sync() is only for PM runtime resume that is prohibited during the codec probe. But the change makes the whole code more consistent, so it's merged as is -- tiwai ]
INFO
Published Date :
Sept. 16, 2025, 8:11 a.m.
Last Modified :
Sept. 16, 2025, 8:11 a.m.
Remotely Exploit :
No
Source :
Linux
Affected Products
The following products are affected by CVE-2023-53275
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to include the fix.
- Ensure mutex locks protect regmap access.
- Apply the patch extending mutex lock coverage.
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CVE-2023-53275 vulnerability anywhere in the article.