CVE-2024-50222

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Exploitation requires the ability to issue write syscalls on the target system.\nAC:H - The defect exists only when the kernel is built with CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y \u2014 with that option off the pre-fix and post-fix code are identical \u2014 and it is a DEBUG_KERNEL-gated x86 debug option explicitly documented \"Disable this for production systems!\", absent from production and distro kernels. The build configuration of the target, plus the need for a large-folio-backed mapping, are conditions the attacker cannot influence.\nPR:L - Any unprivileged local user with write access to a file on a large-folio-capable filesystem (e.g. /dev/shm on huge tmpfs, XFS, bcachefs) can trigger it; no capabilities, namespaces, or mount privileges are required.\nUI:N - The attacker triggers the overrun entirely from its own write syscall with attacker-chosen file offset and length; no action by another user is needed.\nS:U - The out-of-bounds write and the resulting corruption are confined to kernel memory managed by the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Overrunning the single-page kmap slot corrupts adjacent live kmap_local mappings of arbitrary kernel pages, and the short-copy path leaves the folio marked uptodate over a range never written in place, exposing stale page-cache contents to a subsequent read \u2014 a memory-corruption primitive leveragable for kernel information disclosure.\nI:H - Attacker-controlled data is copied past the end of the one-page temporary mapping at an attacker-influenced offset (up to the full folio size), writing into other CPUs' and outer-nested kmap_local fixmap slots and thereby modifying unrelated kernel-mapped pages.\nA:H - The reported outcome is a WARN at mm/highmem.c:622 followed by an interruptible hang, as `generic_perform_write` retries indefinitely on the zero-length copy; unmapped neighbouring fixmap PTEs and the mismatched kunmap index leave stale mappings that can also oops the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/iov_iter.c"], "versions": [{"version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8", "lessThan": "4f7ffa83fa79dd52efbaef366c850aaaae06a469", "status": "affected", "versionType": "git"}, {"version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8", "lessThan": "3a303409f271dfe0987b8f79595138340497a32d", "status": "affected", "versionType": "git"}, {"version": "908a1ad89466c1febf20bfe0037b84fc66f8a3f8", "lessThan": "c749d9b7ebbc5716af7a95f7768634b30d9446ec", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/iov_iter.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.60", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.7", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "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": "6.6", "versionEndExcluding": "6.6.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.11.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4f7ffa83fa79dd52efbaef366c850aaaae06a469"}, {"url": "https://git.kernel.org/stable/c/3a303409f271dfe0987b8f79595138340497a32d"}, {"url": "https://git.kernel.org/stable/c/c749d9b7ebbc5716af7a95f7768634b30d9446ec"}], "title": "iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-50222", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-10-01T20:17:05.945317Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:27:05.080Z"}}]}}

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Pero, en el futuro, \u00bfquiz\u00e1s CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP sea demasiado sorprendente, haya dejado de ser \u00fatil y simplemente deba eliminarse?"}], "id": "CVE-2024-50222", "lastModified": "2026-08-04T11:21:34.447", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-50222", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T20:17:05.945317Z", "version": "2.0.3"}}]}, "published": "2024-11-09T11:15:07.700", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a303409f271dfe0987b8f79595138340497a32d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f7ffa83fa79dd52efbaef366c850aaaae06a469"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c749d9b7ebbc5716af7a95f7768634b30d9446ec"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP", "id": "2324863", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2324863"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-758", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP\ngeneric/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem,\non huge=always tmpfs, issues a warning and then hangs (interruptibly):\nWARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9\nCPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2\n...\ncopy_page_from_iter_atomic+0xa6/0x5ec\ngeneric_perform_write+0xf6/0x1b4\nshmem_file_write_iter+0x54/0x67\nFix copy_page_from_iter_atomic() by limiting it in that case\n(include/linux/skbuff.h skb_frag_must_loop() does similar).\nBut going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too\nsurprising, has outlived its usefulness, and should just be removed?"], "name": "CVE-2024-50222", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2024-11-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50222\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50222\nhttps://lore.kernel.org/linux-cve-announce/2024110926-CVE-2024-50222-4e8c@gregkh/T"], "threat_severity": "Important"}

{}