CVE-2023-52497

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Juhyung reported\nthat EROFS data corruption can be found on a new Intel x86 processor.\nAfter some analysis, it seems that recent x86 processors with the new\nFSRM feature expose this issue with \"rep movsb\".\n\nLet's strictly use the decompressed buffer for lz4 inplace\ndecompression for now. Later, as an useful improvement, we could try\nto tie up these two buffers together in the correct order."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only through the local EROFS compressed read path (read/mmap/readahead \u2192 z_erofs_read_folio/readahead \u2192 z_erofs_lz4_decompress \u2192 z_erofs_lz4_handle_overlap); there is no network protocol or remote peer path into this decompressor.\nAC:L - On the worst-case deployment (EROFS with LZ4 inplace I/O on FSRM-capable x86, as in the original report), ordinary reads of compressed files reliably hit the dual vm_map_ram aliasing path and corrupt decompressed page-cache contents, with no attacker-uncontrollable race required.\nPR:L - Mounting EROFS needs CAP_SYS_ADMIN and is not userns-mountable, but once mounted (Android/embedded system images, or automounted crafted images) any unprivileged local user with read access triggers decompression with no further capability check.\nUI:N - On typical EROFS deployments the filesystem is already mounted, and the attacker triggers the bug entirely with their own reads; automounters similarly mount attacker-supplied images without a separate interactive victim step.\nS:U - Corruption is confined to host-kernel page cache / file contents under the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:N - LZ4_decompress_safe remains bounds-checked; the defect only mis-copies within the aliased in/out pages of the file being decompressed and does not disclose kernel memory or other files' confidential data.\nI:H - Aliased inplace memmove silently corrupts decompressed page-cache contents of shared EROFS files (including system libraries/binaries on Android), so other processes\u2014including privileged ones\u2014observe and execute wrong data, a serious integrity loss of filesystem-backed content.\nA:H - Corruption of shared system file page cache causes widespread userspace failures and can render the system unusable until reboot clears the bad cache; that is a sustained, high availability impact even without a kernel oops."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/erofs/decompressor.c"], "versions": [{"version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "9ff2d260b25df6fe1341a79113d88fecf6bd553e", "status": "affected", "versionType": "git"}, {"version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "a0180e940cf1aefa7d516e20b259ad34f7a8b379", "status": "affected", "versionType": "git"}, {"version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "77cbc04a1a8610e303a0e0d74f2676667876a184", "status": "affected", "versionType": "git"}, {"version": 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"https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184"}, {"url": "https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847"}, {"url": "https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae"}, {"url": "https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e"}, {"url": "https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de"}], "title": "erofs: fix lz4 inplace decompression", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-52497", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-03-07T16:13:41.821063Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:23:41.074Z"}}, {"providerMetadata": {"orgId": 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Juhyung reported\nthat EROFS data corruption can be found on a new Intel x86 processor.\nAfter some analysis, it seems that recent x86 processors with the new\nFSRM feature expose this issue with \"rep movsb\".\n\nLet's strictly use the decompressed buffer for lz4 inplace\ndecompression for now. Later, as an useful improvement, we could try\nto tie up these two buffers together in the correct order."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: corrige la descompresi\u00f3n in situ de lz4 Actualmente, EROFS puede asignar otro b\u00fafer comprimido para la descompresi\u00f3n in situ, que se utiliz\u00f3 para manejar los casos en que algunas p\u00e1ginas de datos comprimidos en realidad no est\u00e1n in situ I/ o. Sin embargo, como la mayor\u00eda de los algoritmos LZ77 simples, LZ4 espera que los datos comprimidos est\u00e9n organizados al final del buffer descomprimido y usa expl\u00edcitamente memmove() para manejar la superposici\u00f3n: ________________________________________________________ |_ direcci\u00f3n de descompresi\u00f3n --> ____ |_ datos comprimidos _| Aunque EROFS organiza los datos comprimidos de esta manera, normalmente asigna dos buffers virtuales individuales, por lo que el orden relativo es incierto. Anteriormente, apenas se observaba ya que LZ4 solo usa memmove() para literales cortos superpuestos y las implementaciones de memmove x86/arm64 parecen cubrirlo por completo y no tienen este problema. Juhyung inform\u00f3 que se pueden encontrar da\u00f1os en los datos EROFS en un nuevo procesador Intel x86. Despu\u00e9s de algunos an\u00e1lisis, parece que los procesadores x86 recientes con la nueva caracter\u00edstica FSRM exponen este problema con \"rep movsb\". Por ahora, usemos estrictamente el b\u00fafer descomprimido para la descompresi\u00f3n in situ de lz4. M\u00e1s adelante, como mejora \u00fatil, podr\u00edamos intentar unir estos dos buffers en el orden correcto."}], "id": "CVE-2023-52497", "lastModified": "2026-08-04T10:18:30.430", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52497", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-07T16:13:41.821063Z", "version": "2.0.3"}}]}, "published": "2024-03-01T14:15:53.273", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ff2d260b25df6fe1341a79113d88fecf6bd553e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: erofs: fix lz4 inplace decompression", "id": "2267333", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267333"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nerofs: fix lz4 inplace decompression\nCurrently EROFS can map another compressed buffer for inplace\ndecompression, that was used to handle the cases that some pages of\ncompressed data are actually not in-place I/O.\nHowever, like most simple LZ77 algorithms, LZ4 expects the compressed\ndata is arranged at the end of the decompressed buffer and it\nexplicitly uses memmove() to handle overlapping:\n__________________________________________________________\n|_ direction of decompression --> ____ |_ compressed data _|\nAlthough EROFS arranges compressed data like this, it typically maps two\nindividual virtual buffers so the relative order is uncertain.\nPreviously, it was hardly observed since LZ4 only uses memmove() for\nshort overlapped literals and x86/arm64 memmove implementations seem to\ncompletely cover it up and they don't have this issue. Juhyung reported\nthat EROFS data corruption can be found on a new Intel x86 processor.\nAfter some analysis, it seems that recent x86 processors with the new\nFSRM feature expose this issue with \"rep movsb\".\nLet's strictly use the decompressed buffer for lz4 inplace\ndecompression for now. Later, as an useful improvement, we could try\nto tie up these two buffers together in the correct order."], "name": "CVE-2023-52497", "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": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52497\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52497\nhttps://lore.kernel.org/linux-cve-announce/20240229155245.1571576-38-lee@kernel.org/T/#u"], "statement": "Red Hat products are not affected by this flaw as erofs is not distributed with any supported product.", "threat_severity": "Moderate"}

{}