CVE-2024-26884: bpf: Fix hashtab overflow check on 32-bit arches
First published: Wed Apr 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix hashtab overflow check on 32-bit arches The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=3.19<4.19.311 | |
| Linux Kernel | >=4.20<5.4.273 | |
| Linux Kernel | >=5.5<5.10.214 | |
| Linux Kernel | >=5.11<5.15.153 | |
| Linux Kernel | >=5.16<6.1.83 | |
| Linux Kernel | >=6.2<6.6.23 | |
| Linux Kernel | >=6.7<6.7.11 | |
| Linux Kernel | >=6.8<6.8.2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1
- https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868
- https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace
- https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016
- https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93
- https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e
- https://launchpad.net/bugs/cve/CVE-2024-26884
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26884
- https://nvd.nist.gov/vuln/detail/CVE-2024-26884
- https://security-tracker.debian.org/tracker/CVE-2024-26884
- https://ubuntu.com/security/CVE-2024-26884
- https://git.kernel.org/linus/6787d916c2cf9850c97a0a3f73e08c43e7d973b1
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Frequently Asked Questions
What is the severity of CVE-2024-26884?
The severity of CVE-2024-26884 is classified as high due to its potential impact on system stability and security.
How do I fix CVE-2024-26884?
To fix CVE-2024-26884, upgrade the Linux kernel to one of the patched versions such as 5.10.223-1 or 6.1.123-1.
What versions of the Linux kernel are affected by CVE-2024-26884?
CVE-2024-26884 affects multiple versions of the Linux kernel from 3.19 to 6.8.2.
Is CVE-2024-26884 related to buffer overflow vulnerabilities?
Yes, CVE-2024-26884 addresses an issue with hashtab overflow checks that can lead to vulnerabilities on 32-bit architectures.
What is the nature of the flaw in CVE-2024-26884?
CVE-2024-26884 involves an overflow check in the hashtab code that incorrectly assumes the result will not be zero.
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