{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26884", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.185Z", "datePublished": "2024-04-17T10:27:39.672Z", "dateUpdated": "2026-08-05T11:28:09.509Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:09.509Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached purely through the bpf(2) syscall — BPF_MAP_CREATE with an oversized max_entries followed by BPF_MAP_UPDATE_ELEM. No network or physical access is involved.\nAC:L - Exploitation is fully deterministic: one map-create with max_entries > 0x80000000 and one map-update, with no race, no timing window and no memory-layout condition outside the attacker's control. The 32-bit-arch requirement is a property of the target platform (ARM32/x86-32/MIPS32 dominate embedded, IoT, automotive and Android-era devices running these stable branches), not a condition the attacker must win.\nPR:L - BPF_MAP_TYPE_HASH/PERCPU_HASH/HASH_OF_MAPS sit in the explicitly \"unprivileged\" branch of map_create()'s privilege switch, requiring no CAP_BPF; the only gate is sysctl_unprivileged_bpf_disabled, which defaults to 0 on the affected 4.19/5.4/5.10 branches and on any build without CONFIG_BPF_UNPRIV_DEFAULT_OFF. A plain local user account therefore suffices.\nUI:N - The attacker performs the entire sequence themselves via two syscalls; no victim action, mount, or file open is needed.\nS:U - The corruption and its effects are confined to kernel memory within the same security authority; no hypervisor, IOMMU or sandbox boundary is crossed.\nC:H - A bogus n_buckets that escapes the overflow check leaves htab->buckets as a zero-sized ZERO_SIZE_PTR allocation while __select_bucket() indexes it with an unmasked, key-derived 32-bit offset, so lookups read and dereference attacker-chosen out-of-bounds kernel memory, yielding an arbitrary-read primitive.\nI:H - The same wild bucket pointer is written through by htab_lock_bucket() (raw_spinlock acquire) and hlist_nulls_add_head_rcu() during map update, giving an out-of-bounds write of kernel list pointers at an attacker-influenced offset — a corruption primitive suitable for control-flow hijack.\nA:H - The identical pattern was demonstrated by syzbot as a kernel crash on arm32, and even the benign UB outcome (n_buckets == 1 with a ~4-billion entry limit) forces unbounded hash-chain walks under a raw spinlock with IRQs disabled, producing hard lockups, RCU stalls and panics." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "33ec04cadb77605b71d9298311919303d390c4d5", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "92c81fbb3ed2e0dfc33a4183a67135e1ab566ace", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "64f00b4df0597590b199b62a37a165473bf658a6", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "3b08cfc65f07b1132c1979d73f014ae6e04de55d", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "a83fdaeaea3677b83a53f72ace2d73a19bcd6d93", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "8435f0961bf3dc65e204094349bd9aeaac1f8868", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "d817f0d34d927f2deb17dadbfe212c9a6a32ac3e", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "a6fa75b5096c0f9826a4fabe22d907b0a5bb1016", "status": "affected", "versionType": "git" }, { "version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6", "lessThan": "6787d916c2cf9850c97a0a3f73e08c43e7d973b1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.311", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.273", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.214", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.153", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "4.19.311" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.4.273" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.10.214" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5" }, { "url": "https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace" }, { "url": "https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6" }, { "url": 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"tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html", "tags": [ "x_transferred" ] } ] }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:50:08.157Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" } ] } ] }, "dataVersion": "5.2" }