CVE-2024-26885

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However, on 32-bit\narches the rounding up itself can overflow mid-way through, because it\nends up doing a left-shift of 32 bits on an unsigned long value. If the\nsize of an unsigned long is four bytes, this is undefined behaviour, so\nthere is no guarantee that we'll end up with a nice and tidy 0-value at\nthe end.\n\nSyzbot managed to turn this into a crash on arm32 by creating a\nDEVMAP_HASH with max_entries > 0x80000000 and then trying to update it.\nFix this by moving the overflow check to before the rounding up\noperation."}], "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 only through the `bpf()` syscall (BPF_MAP_CREATE followed by BPF_MAP_UPDATE_ELEM), requiring local execution on the target; there is no remote or adjacent-network path into `dev_map_init_map()`.\nAC:L - The attacker fully controls both `max_entries` (chosen > 0x80000000) and the update key that becomes the out-of-bounds index, and on an affected 32-bit build the corruption is deterministic and repeatable with no race or unpredictable memory-layout requirement.\nPR:L - Map creation requires CAP_NET_ADMIN, but this is routinely held by ordinary non-root workloads \u2014 containers started with `--cap-add=NET_ADMIN` (no userns remapping, so `ns_capable(&init_user_ns, ...)` succeeds) and processes given a delegated BPF token whose userns grants the capability \u2014 so it is not equivalent to real administrative control of the host kernel.\nUI:N - The attacker performs both syscalls itself; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - With `n_buckets == 0` the bucket mask becomes 0xFFFFFFFF, so hash lookup and `dev_map_hash_get_next_key()` dereference an attacker-chosen address anywhere in the 32-bit space and walk it as an hlist, giving an arbitrary kernel-memory read/disclosure oracle.\nI:H - 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The vulnerability is reached only through the `bpf()` syscall (BPF_MAP_CREATE followed by BPF_MAP_UPDATE_ELEM), requiring local execution on the target; there is no remote or adjacent-network path into `dev_map_init_map()`.\nAC:L - The attacker fully controls both `max_entries` (chosen > 0x80000000) and the update key that becomes the out-of-bounds index, and on an affected 32-bit build the corruption is deterministic and repeatable with no race or unpredictable memory-layout requirement.\nPR:L - Map creation requires CAP_NET_ADMIN, but this is routinely held by ordinary non-root workloads \u2014 containers started with `--cap-add=NET_ADMIN` (no userns remapping, so `ns_capable(&init_user_ns, ...)` succeeds) and processes given a delegated BPF token whose userns grants the capability \u2014 so it is not equivalent to real administrative control of the host kernel.\nUI:N - The attacker performs both syscalls itself; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - 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When\nrounding up to the next power of two, the 32-bit variable storing the\nnumber of buckets can overflow, and the code checks for overflow by\nchecking if the truncated 32-bit value is equal to 0. However, on 32-bit\narches the rounding up itself can overflow mid-way through, because it\nends up doing a left-shift of 32 bits on an unsigned long value. If the\nsize of an unsigned long is four bytes, this is undefined behaviour, so\nthere is no guarantee that we'll end up with a nice and tidy 0-value at\nthe end.\n\nSyzbot managed to turn this into a crash on arm32 by creating a\nDEVMAP_HASH with max_entries > 0x80000000 and then trying to update it.\nFix this by moving the overflow check to before the rounding up\noperation."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.285", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.227", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.153", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.83", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.23", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.11", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.2", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "5.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:10.593Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26885", "state": "PUBLISHED", "dateUpdated": "2026-10-15T00:39:07.846Z", "dateReserved": "2024-02-19T14:20:24.185Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-17T10:27:40.300Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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When\nrounding up to the next power of two, the 32-bit variable storing the\nnumber of buckets can overflow, and the code checks for overflow by\nchecking if the truncated 32-bit value is equal to 0. However, on 32-bit\narches the rounding up itself can overflow mid-way through, because it\nends up doing a left-shift of 32 bits on an unsigned long value. If the\nsize of an unsigned long is four bytes, this is undefined behaviour, so\nthere is no guarantee that we'll end up with a nice and tidy 0-value at\nthe end.\n\nSyzbot managed to turn this into a crash on arm32 by creating a\nDEVMAP_HASH with max_entries > 0x80000000 and then trying to update it.\nFix this by moving the overflow check to before the rounding up\noperation."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige la verificaci\u00f3n de desbordamiento de DEVMAP_HASH en arcos de 32 bits. El c\u00f3digo devmap asigna un n\u00famero de dep\u00f3sitos de hash igual a la siguiente potencia de dos del valor max_entries proporcionado al crear el mapa. Al redondear a la siguiente potencia de dos, la variable de 32 bits que almacena el n\u00famero de dep\u00f3sitos puede desbordarse, y el c\u00f3digo verifica el desbordamiento comprobando si el valor truncado de 32 bits es igual a 0. Sin embargo, en arcos de 32 bits el redondeo hacia arriba puede desbordarse a mitad de camino, porque termina haciendo un desplazamiento hacia la izquierda de 32 bits en un valor largo sin signo. Si el tama\u00f1o de un largo sin firmar es de cuatro bytes, este es un comportamiento indefinido, por lo que no hay garant\u00eda de que terminemos con un valor 0 agradable y ordenado al final. Syzbot logr\u00f3 convertir esto en un bloqueo en arm32 creando un DEVMAP_HASH con max_entries > 0x80000000 y luego intentando actualizarlo. Solucione este problema moviendo la verificaci\u00f3n de desbordamiento antes de la operaci\u00f3n de redondeo."}], "id": "CVE-2024-26885", "lastModified": "2026-10-15T01:17:29.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26885", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-05-28T19:51:32.926370Z", "version": "2.0.3"}}]}, "published": "2024-04-17T11:15:10.210", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches", "id": "2275680", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275680"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-121", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix DEVMAP_HASH overflow check on 32-bit arches\nThe devmap code allocates a number hash buckets equal to the next power\nof two of the max_entries value provided when creating the map. When\nrounding up to the next power of two, the 32-bit variable storing the\nnumber of buckets can overflow, and the code checks for overflow by\nchecking if the truncated 32-bit value is equal to 0. However, on 32-bit\narches the rounding up itself can overflow mid-way through, because it\nends up doing a left-shift of 32 bits on an unsigned long value. If the\nsize of an unsigned long is four bytes, this is undefined behaviour, so\nthere is no guarantee that we'll end up with a nice and tidy 0-value at\nthe end.\nSyzbot managed to turn this into a crash on arm32 by creating a\nDEVMAP_HASH with max_entries > 0x80000000 and then trying to update it.\nFix this by moving the overflow check to before the rounding up\noperation."], "name": "CVE-2024-26885", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26885\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26885\nhttps://lore.kernel.org/linux-cve-announce/2024041741-CVE-2024-26885-4224@gregkh/T"], "threat_severity": "Low"}

{}