{"id":"CVE-2024-26884","summary":"bpf: Fix hashtab overflow check on 32-bit arches","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix hashtab overflow check on 32-bit arches\n\nThe hashtab code relies on roundup_pow_of_two() to compute the number of\nhash buckets, and contains an overflow check by checking if the\nresulting value is 0. However, on 32-bit arches, the roundup code itself\ncan overflow by doing a 32-bit left-shift of an unsigned long value,\nwhich is undefined behaviour, so it is not guaranteed to truncate\nneatly. This was triggered by syzbot on the DEVMAP_HASH type, which\ncontains the same check, copied from the hashtab code. So apply the same\nfix to hashtab, by moving the overflow check to before the roundup.","modified":"2026-04-02T10:06:18.474745Z","published":"2024-04-17T10:27:39.672Z","related":["SUSE-SU-2024:1643-1","SUSE-SU-2024:1644-1","SUSE-SU-2024:1646-1","SUSE-SU-2024:1659-1","SUSE-SU-2024:1663-1","SUSE-SU-2024:1870-1","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26884.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26884.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26884"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"daaf427c6ab392bedcd018e326b2ffa1e1110cd6"},{"fixed":"33ec04cadb77605b71d9298311919303d390c4d5"},{"fixed":"92c81fbb3ed2e0dfc33a4183a67135e1ab566ace"},{"fixed":"64f00b4df0597590b199b62a37a165473bf658a6"},{"fixed":"3b08cfc65f07b1132c1979d73f014ae6e04de55d"},{"fixed":"a83fdaeaea3677b83a53f72ace2d73a19bcd6d93"},{"fixed":"8435f0961bf3dc65e204094349bd9aeaac1f8868"},{"fixed":"d817f0d34d927f2deb17dadbfe212c9a6a32ac3e"},{"fixed":"a6fa75b5096c0f9826a4fabe22d907b0a5bb1016"},{"fixed":"6787d916c2cf9850c97a0a3f73e08c43e7d973b1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26884.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}