{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-42258", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-30T07:40:12.257Z", "datePublished": "2024-08-12T14:16:13.227Z", "dateUpdated": "2026-08-05T11:36:07.867Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:07.867Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines\n\nYves-Alexis Perez reported commit 4ef9ad19e176 (\"mm: huge_memory: don't\nforce huge page alignment on 32 bit\") didn't work for x86_32 [1]. It is\nbecause x86_32 uses CONFIG_X86_32 instead of CONFIG_32BIT.\n\n!CONFIG_64BIT should cover all 32 bit machines.\n\n[1] https://lore.kernel.org/linux-mm/CAHbLzkr1LwH3pcTgM+aGQ31ip2bKqiqEQ8=FQB+t2c3dhNKNHA@mail.gmail.com/" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flawed placement logic is reached only through local process address-space operations — `mmap(2)` for anonymous mappings ≥2MB and `execve(2)`/`ld.so` library loads on ext4/xfs/btrfs/fuse — with no network-facing input processing involved. An attacker needs local execution on the 32-bit target (i386 desktop/server, or ARM32-LPAE embedded/IoT/automotive controller).\nAC:L - The behaviour is fully deterministic with no race or memory-layout precondition: on any x86_32/ARM32 kernel with THP enabled (the Debian/Ubuntu i386 PAE default and common on ARM LPAE), every mapping ≥2MB is unconditionally rounded to a 2MB boundary, yielding a fixed, precomputable address. The attacker simply issues a large mmap or reads the predictable base of a large library.\nPR:L - Any ordinary unprivileged local user can allocate ≥2MB mappings and observe the zero-entropy 2MB-aligned placement, and can equally derive the now-deterministic library base addresses of other, more privileged processes. No capability, namespace, or administrative access is required.\nUI:N - No victim action is needed — the kernel applies the alignment automatically to every qualifying mapping in every process on the system, including long-running root daemons that are already mapped. The attacker acts entirely on their own.\nS:U - The weakened randomization and the address-space exhaustion are both confined to the same operating-system security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - With `mmap_rnd_bits` at the 32-bit default of 8, PMD alignment consumes every randomization bit, so ASLR is completely — not partially — defeated for all large mappings, exposing the exact address-space layout of arbitrary processes including setuid binaries and network daemons. This total loss of a core memory-confidentiality protection makes the contents of victim memory reliably locatable and disclosable, as the reporter demonstrated in the regreSSHion (CVE-2024-6387) context on i386.\nI:N - The defect only influences where mappings are placed; the padding arithmetic retains its overflow guards and the returned address stays inside the reserved region, so no out-of-bounds write, use-after-free, or other data-modification primitive arises from the flaw itself.\nA:H - Forcing 2MB alignment on the 2–3GB 32-bit user address space leaves multi-megabyte holes between mappings, and the resulting fragmentation was reported in practice as mmap failures and premature OOM on openSUSE i586 and Android compat workloads. On a 32-bit embedded or industrial controller this causes the primary workload to fail allocations and be OOM-killed, denying service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/huge_memory.c" ], "versions": [ { "version": "87632bc9ecff5ded93433bc0fca428019bdd1cfe", "lessThan": "89f2914dd4b47d2fad3deef0d700f9526d98d11f", "status": "affected", "versionType": "git" }, { "version": "6ea9aa8d97e6563676094cb35755884173269555", "lessThan": "a5c399fe433a115e9d3693169b5f357f3194af0a", "status": "affected", "versionType": "git" }, { "version": "4ef9ad19e17676b9ef071309bc62020e2373705d", "lessThan": "7e1f4efb8d6140b2ec79bf760c43e1fc186e8dfc", "status": "affected", "versionType": "git" }, { "version": "4ef9ad19e17676b9ef071309bc62020e2373705d", "lessThan": "d9592025000b3cf26c742f3505da7b83aedc26d5", "status": "affected", "versionType": "git" }, { "version": "7432376c913381c5f24d373a87ff629bbde94b47", "status": "affected", "versionType": "git" }, { "version": "6.1.81", "lessThan": "6.1.105", "status": "affected", "versionType": "semver" }, { "version": "6.7.6", "lessThan": "6.8", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/huge_memory.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.105", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.3", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "6.1.81", "versionEndExcluding": "6.1.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.10.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/89f2914dd4b47d2fad3deef0d700f9526d98d11f" }, { "url": "https://git.kernel.org/stable/c/a5c399fe433a115e9d3693169b5f357f3194af0a" }, { "url": "https://git.kernel.org/stable/c/7e1f4efb8d6140b2ec79bf760c43e1fc186e8dfc" }, { "url": "https://git.kernel.org/stable/c/d9592025000b3cf26c742f3505da7b83aedc26d5" } ], "title": "mm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-42258", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:12:53.509414Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:33.852Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:02:53.962Z" } } ] } }