CVE-2024-26621

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https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/\n[2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The flaw's effect \u2014 a fully predictable memory layout for every process, including internet-facing daemons such as sshd on 32-bit/compat systems \u2014 is usable by an entirely remote, unauthenticated attacker who never needs any access to the host; this is the exact condition Qualys leveraged for regreSSHion, and the CVE's own reference set is the oss-security thread on that remote impact.\nAC:L - On 32-bit and compat processes the outcome is fully deterministic, not probabilistic \u2014 libc lands at a fixed address (e.g. 0xf7c00000) on every single run, so nothing about exploitation depends on conditions outside the attacker's control.\nPR:N - No credentials, account, or local foothold is required; the library and heap base addresses are constants that can be computed offline from the same distro or firmware image, and they are identical for privileged root daemons and unprivileged processes alike.\nUI:N - The kernel applies the 2 MB alignment unconditionally on every mmap of a \u22652 MB file or anonymous mapping; no victim action is needed for the layout to become predictable.\nS:U - The kernel is the security authority governing process address-space layout, and the lost randomization affects resources it already manages; no sandbox, VM, or IOMMU boundary is crossed.\nC:H - This is a complete, permanent disclosure of the exact secret ASLR exists to protect \u2014 on 32-bit all 8 bits of mmap entropy are annihilated, exposing the full mapping layout of every process on the system rather than a bounded few-byte leak.\nI:N - Defeating address randomization does not by itself 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this is the exact condition Qualys leveraged for regreSSHion, and the CVE's own reference set is the oss-security thread on that remote impact.\nAC:L - On 32-bit and compat processes the outcome is fully deterministic, not probabilistic \u2014 libc lands at a fixed address (e.g. 0xf7c00000) on every single run, so nothing about exploitation depends on conditions outside the attacker's control.\nPR:N - No credentials, account, or local foothold is required; the library and heap base addresses are constants that can be computed offline from the same distro or firmware image, and they are identical for privileged root daemons and unprivileged processes alike.\nUI:N - The kernel applies the 2 MB alignment unconditionally on every mmap of a \u22652 MB file or anonymous mapping; no victim action is needed for the layout to become predictable.\nS:U - The kernel is the security authority governing process address-space layout, and the lost randomization affects resources it already manages; no sandbox, VM, or IOMMU boundary is crossed.\nC:H - This is a complete, permanent disclosure of the exact secret ASLR exists to protect \u2014 on 32-bit all 8 bits of mmap entropy are annihilated, exposing the full mapping layout of every process on the system rather than a bounded few-byte leak.\nI:N - Defeating address randomization does not by itself write to or modify any kernel or userspace data; 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/huge_memory.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "87632bc9ecff5ded93433bc0fca428019bdd1cfe", "status": "affected", "version": "1854bc6e2420472676c5c90d3d6b15f6cd640e40", "versionType": "git"}, {"lessThan": "6ea9aa8d97e6563676094cb35755884173269555", "status": "affected", "version": "1854bc6e2420472676c5c90d3d6b15f6cd640e40", "versionType": "git"}, {"lessThan": "7432376c913381c5f24d373a87ff629bbde94b47", "status": "affected", "version": "1854bc6e2420472676c5c90d3d6b15f6cd640e40", "versionType": "git"}, {"lessThan": "4ef9ad19e17676b9ef071309bc62020e2373705d", "status": "affected", "version": "1854bc6e2420472676c5c90d3d6b15f6cd640e40", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/huge_memory.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.81", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.46", "versionType": "semver"}, {"lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6CD77F1B-10FD-4644-8A8C-7A1C84C80D3F", "versionEndExcluding": "6.1.81", "versionStartIncluding": "5.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FA11941E-81FB-484C-B583-881EEB488340", "versionEndExcluding": "6.6.46", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C6D6A5C8-7308-42A9-8A72-ABF3DEA4BB82", "versionEndExcluding": "6.7.6", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*", "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: huge_memory: don't force huge page alignment on 32 bit\n\ncommit efa7df3e3bb5 (\"mm: align larger anonymous mappings on THP\nboundaries\") caused two issues [1] [2] reported on 32 bit system or compat\nuserspace.\n\nIt doesn't make too much sense to force huge page alignment on 32 bit\nsystem due to the constrained virtual address space.\n\n[1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/\n[2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mm: huge_memory: no forzar una alineaci\u00f3n de p\u00e1gina enorme en el commit de 32 bits efa7df3e3bb5 (\"mm: alinear asignaciones an\u00f3nimas m\u00e1s grandes en los l\u00edmites de THP\") caus\u00f3 dos problemas [1] [2] informado en un sistema de 32 bits o espacio de usuario compatible. No tiene mucho sentido forzar una gran alineaci\u00f3n de p\u00e1ginas en un sistema de 32 bits debido al espacio limitado de direcciones virtuales. [1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/ [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD- sQ@mail.gmail.com/"}], "id": "CVE-2024-26621", "lastModified": "2026-08-04T11:16:49.370", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": 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{"bugzilla": {"description": "kernel: mm: huge_memory: don't force huge page alignment on 32 bit", "id": "2267505", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267505"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: huge_memory: don't force huge page alignment on 32 bit\ncommit efa7df3e3bb5 (\"mm: align larger anonymous mappings on THP\nboundaries\") caused two issues [1] [2] reported on 32 bit system or compat\nuserspace.\nIt doesn't make too much sense to force huge page alignment on 32 bit\nsystem due to the constrained virtual address space.\n[1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/\n[2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/"], "name": "CVE-2024-26621", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26621\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26621\nhttps://lore.kernel.org/linux-cve-announce/2024030255-CVE-2024-26621-9300@gregkh/T/#u"], "threat_severity": "Low"}

{}