CVE-2022-48636

MEDIUM
Published Apr 28, 2024 Modified Mar 21, 2025 CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup Fix Oops in dasd_alias_get_start_dev() function caused by the pavgroup pointer being NULL. The pavgroup pointer is checked on the entrance of the function but without the lcu->lock being held. Therefore there is a race window between dasd_alias_get_start_dev() and _lcu_update() which sets pavgroup to NULL with the lcu->lock held. Fix by checking the pavgroup pointer with lcu->lock held.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/2e473351400e3dd66f0b71eddcef82ee45a584c1 https://git.kernel.org/stable/c/49f401a98b318761ca2e15d4c7869a20043fbed4 https://git.kernel.org/stable/c/650a2e79d176db753654d3dde88e53a2033036ac https://git.kernel.org/stable/c/aaba5ff2742043705bc4c02fd0b2b246e2e16da1 https://git.kernel.org/stable/c/d3a67c21b18f33c79382084af556557c442f12a6 https://git.kernel.org/stable/c/d86b4267834e6d4af62e3073e48166e349ab1b70 https://git.kernel.org/stable/c/db7ba07108a48c0f95b74fabbfd5d63e924f992d https://git.kernel.org/stable/c/f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b https://git.kernel.org/stable/c/2e473351400e3dd66f0b71eddcef82ee45a584c1 https://git.kernel.org/stable/c/49f401a98b318761ca2e15d4c7869a20043fbed4 https://git.kernel.org/stable/c/650a2e79d176db753654d3dde88e53a2033036ac https://git.kernel.org/stable/c/aaba5ff2742043705bc4c02fd0b2b246e2e16da1 https://git.kernel.org/stable/c/d3a67c21b18f33c79382084af556557c442f12a6 https://git.kernel.org/stable/c/d86b4267834e6d4af62e3073e48166e349ab1b70 https://git.kernel.org/stable/c/db7ba07108a48c0f95b74fabbfd5d63e924f992d https://git.kernel.org/stable/c/f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b

Frequently Asked Questions

What is CVE-2022-48636? +
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup Fix Oops in dasd_alias_get_start_dev() function caused by the pavgroup pointer being NULL. The pavgroup pointer is checked on the entrance of the function but without the lcu->lock being held. Therefore there is a race window between dasd_alias_get_start_dev() and _lcu_update() which sets pavgroup to NULL with the lcu->lock held. Fix by checking the pavgroup pointer with lcu->lock held. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2022-48636? +
CVE-2022-48636 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2022-48636? +
CVE-2022-48636 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2022-48636? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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