Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.19, < 4.19.311 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Patch
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dPatch
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Patch
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Patch
- https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Patch
- https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566acePatch
- https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Patch
- https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Patch
- https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3ePatch
- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Patch
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dPatch
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Patch
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Patch
- https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Patch
- https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566acePatch
FAQ
What is CVE-2024-26884?
CVE-2024-26884 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 buc...
How severe is CVE-2024-26884?
CVE-2024-26884 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-26884?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.