CVE-2022-48994: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. seq_copy_in_user() and seq_copy_in_kernel() did not have prototypes matching snd_seq_dump_func_t. Adjust this and remove the casts. There are not resulting binary output differences. This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches.

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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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.9.336
linux	linux_kernel	4.10 — 4.14.302
linux	linux_kernel	4.15 — 4.19.269
linux	linux_kernel	4.20 — 5.4.227
linux	linux_kernel	5.5 — 5.10.159
linux	linux_kernel	5.11 — 5.15.83
linux	linux_kernel	5.16 — 6.0.13
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/05530ef7cf7c7d700f6753f058999b1b5099a026 https://git.kernel.org/stable/c/13ee8fb5410b740c8dd2867d3557c7662f7dda2d https://git.kernel.org/stable/c/15c42ab8d43acb73e2eba361ad05822c0af0ecfa https://git.kernel.org/stable/c/2f46e95bf344abc4e74f8158901d32a869e0adb6 https://git.kernel.org/stable/c/63badfed200219ca656968725f1a43df293ac936 https://git.kernel.org/stable/c/b38486e82ecb9f3046e0184205f6b61408fc40c9 https://git.kernel.org/stable/c/e385360705a0b346bdb57ce938249175d0613b8a https://git.kernel.org/stable/c/fccd454129f6a0739651f7f58307cdb631fd6e89

Frequently Asked Questions

What is CVE-2022-48994? +

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Fix function prototype mismatch in snd_seq_expand_var_event With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. seq_copy_in_user() and seq_copy_in_kernel() did not have prototypes matching snd_seq_dump_func_t. Adjust this and remove the casts. There are not resulting binary output differences. This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48994? +

CVE-2022-48994 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-2022-48994? +

CVE-2022-48994 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-2022-48994? +

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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CVE-2022-48994