CVE-2024-38616: wifi: carl9170: re-fix fortified-memset warning
First published: Wed Jun 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: wifi: carl9170: re-fix fortified-memset warning The carl9170_tx_release() function sometimes triggers a fortified-memset warning in my randconfig builds: In file included from include/linux/string.h:254, from drivers/net/wireless/ath/carl9170/tx.c:40: In function 'fortify_memset_chk', inlined from 'carl9170_tx_release' at drivers/net/wireless/ath/carl9170/tx.c:283:2, inlined from 'kref_put' at include/linux/kref.h:65:3, inlined from 'carl9170_tx_put_skb' at drivers/net/wireless/ath/carl9170/tx.c:342:9: include/linux/fortify-string.h:493:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] 493 | __write_overflow_field(p_size_field, size); Kees previously tried to avoid this by using memset_after(), but it seems this does not fully address the problem. I noticed that the memset_after() here is done on a different part of the union (status) than the original cast was from (rate_driver_data), which may confuse the compiler. Unfortunately, the memset_after() trick does not work on driver_rates[] because that is part of an anonymous struct, and I could not get struct_group() to do this either. Using two separate memset() calls on the two members does address the warning though.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.17<6.1.93 | |
| Linux Kernel | >=6.2<6.6.33 | |
| Linux Kernel | >=6.7<6.8.12 | |
| Linux Kernel | >=6.9<6.9.3 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/042a39bb8e0812466327a5102606e88a5a4f8c02
- https://git.kernel.org/stable/c/066afafc10c9476ee36c47c9062527a17e763901
- https://git.kernel.org/stable/c/0c38c9c460bb8ce8d6f6cf316e0d71a70983ec83
- https://git.kernel.org/stable/c/13857683126e8a6492af73c74d702835f7a2175b
- https://git.kernel.org/stable/c/87586467098281f04fa93e59fe3a516b954bddc4
- https://launchpad.net/bugs/cve/CVE-2024-38616
- https://git.kernel.org/linus/066afafc10c9476ee36c47c9062527a17e763901
- https://security-tracker.debian.org/tracker/CVE-2024-38616
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38616
- https://nvd.nist.gov/vuln/detail/CVE-2024-38616
- https://ubuntu.com/security/CVE-2024-38616
Frequently Asked Questions
What is the severity of CVE-2024-38616?
CVE-2024-38616 is considered to have a moderate severity level due to potential issues with memory handling in the Linux kernel.
How do I fix CVE-2024-38616?
To fix CVE-2024-38616, upgrade to the updated kernel versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
Can CVE-2024-38616 be exploited remotely?
CVE-2024-38616 is not directly exploitable remotely as it primarily impacts the kernel and requires local access to exploit.
What versions of the Linux kernel are affected by CVE-2024-38616?
The affected Linux kernel versions include those prior to updates identified in CVE-2024-38616, specifically prior to 5.10.223-1, 5.10.226-1, 6.1.123-1, and others listed in the advisory.
Is there a workaround for CVE-2024-38616 if I cannot update my kernel?
Currently, there are no documented workarounds for CVE-2024-38616, so applying the kernel update is the recommended approach.
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