High 7.8Published Apr 17, 2024

CVE-2024-26884bpf: Fix hashtab overflow check on 32-bit arches

Updated under an hour ago (Oct 28, 2026, 8:23 AM ET)

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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 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

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

References

https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5	patch
https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace	patch
https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6	patch
https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d	patch
https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93	patch
https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868	patch
https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e	patch
https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016	patch
https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1	patch
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
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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.