CVE-2024-26884
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.25% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119, CWE-190
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
- https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Patch
- https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Patch
- https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3ePatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.