{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52497", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.305Z", "datePublished": "2024-02-29T15:52:13.428Z", "dateUpdated": "2026-08-05T09:10:14.948Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:14.948Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix lz4 inplace decompression\n\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.\n\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 _|\n\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\".\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 → z_erofs_read_folio/readahead → z_erofs_lz4_decompress → 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—including privileged ones—observe 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": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "33bf23c9940dbd3a22aad7f0cda4c84ed5701847", "status": "affected", "versionType": "git" }, { "version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "f36d200a80a3ca025532ed60dd1ac21b620e14ae", "status": "affected", "versionType": "git" }, { "version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "bffc4cc334c5bb31ded54bc3cfd651735a3cb79e", "status": "affected", "versionType": "git" }, { "version": "0ffd71bcc3a03ebb3551661a36052488369c4de9", "lessThan": "3c12466b6b7bf1e56f9b32c366a3d83d87afb4de", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/erofs/decompressor.c" ], "versions": [ { "version": "5.3", "status": "affected" }, { "version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.211", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.150", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.76", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.15", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.3", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.3", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.76" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9ff2d260b25df6fe1341a79113d88fecf6bd553e" }, { "url": "https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379" }, { "url": "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": 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"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html", "tags": [ "x_transferred" ] } ] } ] }, "dataVersion": "5.2" }