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CVE-2022-49733— ALSA: pcm: oss: Fix race at SNDCTL_DSP_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OSS PCM SNDCTL_DSP_SYNC ioctl中的竞争条件，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43< 4051324a6dafd7053c74c475e80b3ba10ae672b0 affected
e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43< fce793a056c604b41a298317cf704dae255f1b36 affected
e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43< 8015ef9e8a0ee5cecfd0cb6805834d007ab26f86 affected
e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43< 723ac5ab2891b6c10dd6cc78ef5456af593490eb affected
e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43< 8423f0b6d513b259fdab9c9bf4aaa6188d054c2d affected
2.6.20 affected
< 2.6.20 unaffected
5.4.215≤ 5.4.* unaffected
… +4 more rows
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I. Basic Information for CVE-2022-49733

Vulnerability Information
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Vulnerability Title
ALSA: pcm: oss: Fix race at SNDCTL_DSP_SYNC
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix race at SNDCTL_DSP_SYNC There is a small race window at snd_pcm_oss_sync() that is called from OSS PCM SNDCTL_DSP_SYNC ioctl; namely the function calls snd_pcm_oss_make_ready() at first, then takes the params_lock mutex for the rest. When the stream is set up again by another thread between them, it leads to inconsistency, and may result in unexpected results such as NULL dereference of OSS buffer as a fuzzer spotted recently. The fix is simply to cover snd_pcm_oss_make_ready() call into the same params_lock mutex with snd_pcm_oss_make_ready_locked() variant.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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OSS PCM SNDCTL_DSP_SYNC ioctl中的竞争条件，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 e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 ~ 4051324a6dafd7053c74c475e80b3ba10ae672b0 -
Linux Linux 2.6.20 -

II. Public POCs for CVE-2022-49733

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III. Intelligence Information for CVE-2022-49733

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Patches & Fixes for CVE-2022-49733 (5)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux