{"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"}}]}}