CVE-2024-47712: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param In the `wilc_parse_join_bss_param` function, the TSF field of the `ies` structure is accessed after the RCU read-side critical section is unlocked. According to RCU usage rules, this is illegal. Reusing this pointer can lead to unpredictable behavior, including accessing memory that has been updated or causing use-after-free issues. This possible bug was identified using a static analysis tool developed by myself, specifically designed to detect RCU-related issues. To address this, the TSF value is now stored in a local variable `ies_tsf` before the RCU lock is released. The `param->tsf_lo` field is then assigned using this local variable, ensuring that the TSF value is safely accessed.

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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	Versions
linux	linux_kernel	5.4.273 — 5.5
linux	linux_kernel	5.10.214 — 5.10.227
linux	linux_kernel	5.15.153 — 5.15.168
linux	linux_kernel	6.1.83 — 6.1.113
linux	linux_kernel	6.6.23 — 6.6.54
linux	linux_kernel	6.7.11 — 6.8
linux	linux_kernel	6.8.2 — 6.9
linux	linux_kernel	< 6.10.13
linux	linux_kernel	6.11 — 6.11.2

References

Advisories & Patches

https://git.kernel.org/stable/c/2f944e6255c2fc1c9bd9ee32f6b14ee0b2a51eb5 https://git.kernel.org/stable/c/557418e1704605a81c9e26732449f71b1d40ba1e https://git.kernel.org/stable/c/6d7c6ae1efb1ff68bc01d79d94fdf0388f86cdd8 https://git.kernel.org/stable/c/79510414a7626317f13cc9073244ab7a8deb3192 https://git.kernel.org/stable/c/84398204c5df5aaf89453056cf0647cda9664d2b https://git.kernel.org/stable/c/b040b71d99ee5e17bb7a743dc01cbfcae8908ce1 https://git.kernel.org/stable/c/bf090f4fe935294361eabd9dc5a949fdd77d3d1b

Other References

https://git.kernel.org/stable/c/5a24cedc243ace5ed7c1016f52a7bfc8f5b07815 https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-47712? +

In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param In the `wilc_parse_join_bss_param` function, the TSF field of the `ies` structure is accessed after the RCU read-side critical section is unlocked. According to RCU usage rules, this is illegal. Reusing this pointer can lead to unpredictable behavior, including accessing memory that has been updated or causing use-after-free issues. This possible bug was identified using a static analysis tool developed by myself, specifically designed to detect RCU-related issues. To address this, the TSF value is now stored in a local variable `ies_tsf` before the RCU lock is released. The `param->tsf_lo` field is then assigned using this local variable, ensuring that the TSF value is safely accessed. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-47712? +

CVE-2024-47712 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-2024-47712? +

CVE-2024-47712 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-2024-47712? +

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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