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CVE-2023-53275— ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于snd_hdac_regmap_sync函数中未对codec-regmap进行锁保护，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Hard EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 69d5dc286d05441ca2f854ae8df11201f6f9b706< 109f0aaa0b8838a88af9125b79579023539300a7 affected
1a462be52f4505a2719631fb5aa7bfdbd37bfd8d< 9f9eed451176ffcac6b5ba0f6dae1a6b4a1cb0eb affected
1a462be52f4505a2719631fb5aa7bfdbd37bfd8d< 8703b26387e1fa4f8749db98d24c67617b873acb affected
1a462be52f4505a2719631fb5aa7bfdbd37bfd8d< cdd412b528dee6e0851c4735d6676ec138da13a4 affected
1a462be52f4505a2719631fb5aa7bfdbd37bfd8d< b32e40379e5b2814de0c4bc199edc2d82317dc07 affected
1a462be52f4505a2719631fb5aa7bfdbd37bfd8d< 1f4a08fed450db87fbb5ff5105354158bdbe1a22 affected
5.4.43< 5.4.255 affected
5.6 affected
… +7 more rows
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I. Basic Information for CVE-2023-53275

Vulnerability Information
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Vulnerability Title
ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync()
Source: CVE Program / CVE List V5
Vulnerability 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 ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于snd_hdac_regmap_sync函数中未对codec-regmap进行锁保护，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 69d5dc286d05441ca2f854ae8df11201f6f9b706 ~ 109f0aaa0b8838a88af9125b79579023539300a7 -
Linux Linux 5.6 -

II. Public POCs for CVE-2023-53275

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III. Intelligence Information for CVE-2023-53275

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Same Patch Batch · Linux · 2025-09-16 · 115 CVEs total

CVE-2022-50350 9.8 CRITICAL scsi: target: iscsi: Fix a race condition between login_work and the login thread
CVE-2025-39806 8.8 HIGH HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()
CVE-2023-53315 8.8 HIGH wifi: ath11k: Fix SKB corruption in REO destination ring
CVE-2023-53305 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free
CVE-2025-39827 8.8 HIGH net: rose: include node references in rose_neigh refcount
CVE-2025-39826 8.8 HIGH net: rose: convert 'use' field to refcount_t
CVE-2023-53322 8.8 HIGH scsi: qla2xxx: Wait for io return on terminate rport
CVE-2023-53297 8.8 HIGH Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp
CVE-2025-39809 8.4 HIGH HID: intel-thc-hid: intel-quicki2c: Fix ACPI dsd ICRS/ISUB length
CVE-2023-53333 8.2 HIGH netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one
CVE-2023-53314 7.8 HIGH fbdev/ep93xx-fb: Do not assign to struct fb_info.dev
CVE-2025-39818 7.8 HIGH HID: intel-thc-hid: intel-thc: Fix incorrect pointer arithmetic in I2C regs save
CVE-2025-39815 7.8 HIGH RISC-V: KVM: fix stack overrun when loading vlenb
CVE-2023-53286 7.8 HIGH RDMA/mlx5: Return the firmware result upon destroying QP/RQ
CVE-2023-53311 7.8 HIGH nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
CVE-2022-50341 7.8 HIGH cifs: fix oops during encryption
CVE-2025-39825 7.8 HIGH smb: client: fix race with concurrent opens in rename(2)
CVE-2023-53263 7.8 HIGH drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create
CVE-2025-39810 7.8 HIGH bnxt_en: Fix memory corruption when FW resources change during ifdown
CVE-2023-53331 7.8 HIGH pstore/ram: Check start of empty przs during init

Showing top 20 of 115 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53275

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