{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43166", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.990Z", "datePublished": "2026-05-06T11:27:43.242Z", "dateUpdated": "2026-08-05T12:26:16.817Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:16.817Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix interlaced plain identification for encoded extents\n\nOnly plain data whose start position and on-disk physical length are\nboth aligned to the block size should be classified as interlaced\nplain extents. Otherwise, it must be treated as shifted plain extents.\n\nThis issue was found by syzbot using a crafted compressed image\ncontaining plain extents with unaligned physical lengths, which can\ncause OOB read in z_erofs_transform_plain()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached by local VFS operations on a crafted EROFS image: mount the image and read/open a compressed file so EROFS performs readahead/decompression. There is no direct network, adjacent, or physical protocol entry point in EROFS itself.\nAC:L - The trigger is deterministic malformed extent metadata with an aligned physical start and unaligned encoded length; syzbot reproduced it with a crafted image and ordinary mount/open/read activity. No attacker-uncontrolled race or fragile timing condition is required.\nPR:N - An attacker can craft and supply the malicious EROFS image without privileges; the privileged filesystem mount/read can be performed by an interacting victim or image-processing environment. EROFS is not marked FS_USERNS_MOUNT, so a purely self-triggered local mount would require CAP_SYS_ADMIN, but the higher-severity defensible scenario is malicious media/image handling.\nUI:R - Exploitation requires some user or system action to mount or otherwise process the crafted EROFS image and read/open the affected file. The vulnerable code is not reached passively before the image is mounted/read.\nS:U - The bug is in kernel filesystem parsing/decompression and affects the same kernel security authority. It does not cross a hypervisor, VM, IOMMU, or sandbox boundary by itself.\nC:H - The bug causes a slab/out-of-bounds read of up to a page-sized copy in z_erofs_transform_plain(), and the copied bytes are placed into output/page-cache data readable through the file path. This can disclose kernel memory and is not limited to a few fixed bytes.\nI:N - The faulty operation is an out-of-bounds read from the input page mapping followed by copying into the file output page; it does not write out of bounds or corrupt kernel control data. No direct integrity modification primitive is evident.\nA:H - syzbot demonstrated a KASAN slab-out-of-bounds/use-after-free read in this path, and such kernel memory-safety faults can produce an oops/panic on hardened or faulting configurations. The crafted image can retrigger the fault through repeated reads." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/erofs/zmap.c" ], "versions": [ { "version": "1d191b4ca51d73699cb127386b95ac152af2b930", "lessThan": "9d5a97bc71ed5783687705c708454c4453aa91d1", "status": "affected", "versionType": "git" }, { "version": "1d191b4ca51d73699cb127386b95ac152af2b930", "lessThan": "d3790f26d38606f020212486359b84632c19d08b", "status": "affected", "versionType": "git" }, { "version": "1d191b4ca51d73699cb127386b95ac152af2b930", "lessThan": "4a2d046e4b13202a6301a993961f5b30ae4d7119", "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/zmap.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.15", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9d5a97bc71ed5783687705c708454c4453aa91d1" }, { "url": "https://git.kernel.org/stable/c/d3790f26d38606f020212486359b84632c19d08b" }, { "url": "https://git.kernel.org/stable/c/4a2d046e4b13202a6301a993961f5b30ae4d7119" } ], "title": "erofs: fix interlaced plain identification for encoded extents", "x_generator": { "engine": "bippy-1.2.0" } } } }