CVE-2024-26884bpf: Fix hashtab overflow check on 32-bit arches
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-190
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before 33ec04cadb77605b71d9298311919303d390c4d5; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before 92c81fbb3ed2e0dfc33a4183a67135e1ab566ace; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before 64f00b4df0597590b199b62a37a165473bf658a6; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before 3b08cfc65f07b1132c1979d73f014ae6e04de55d; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before a83fdaeaea3677b83a53f72ace2d73a19bcd6d93; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before 8435f0961bf3dc65e204094349bd9aeaac1f8868; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before d817f0d34d927f2deb17dadbfe212c9a6a32ac3e; from daaf427c6ab392bedcd018e326b2ffa1e1110cd6 before a6fa75b5096c0f9826a4fabe22d907b0a5bb1016; and 1 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.19 before 4.19.311; from 4.20 before 5.4.273; from 5.5 before 5.10.214; from 5.11 before 5.15.153; from 5.16 before 6.1.83; from 6.2 before 6.6.23; from 6.7 before 6.7.11; from 6.8 before 6.8.2 | NVD |
References
- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5patch
- https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566acepatch
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6patch
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dpatch
- https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93patch
- https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868patch
- https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3epatch
- https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016patch
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.