{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49739", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-03-27T16:39:17.986Z", "datePublished": "2025-03-27T16:42:51.609Z", "dateUpdated": "2026-08-05T08:56:11.211Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:11.211Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Always check inode size of inline inodes\n\nCheck if the inode size of stuffed (inline) inodes is within the allowed\nrange when reading inodes from disk (gfs2_dinode_in()). This prevents\nus from on-disk corruption.\n\nThe two checks in stuffed_readpage() and gfs2_unstuffer_page() that just\ntruncate inline data to the maximum allowed size don't actually make\nsense, and they can be removed now as well." } ], "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 flaw is reached by mounting or using a crafted GFS2 block device/image (mount → gfs2_fill_super → inode refresh → gfs2_dinode_in / iomap or directory stuffed reads); GFS2 has no network protocol front end that parses these dinode fields.\nAC:L - The attacker fully controls on-disk di_size, di_height, and related dinode fields, so an oversized stuffed inode size deterministically bypasses the missing gfs2_dinode_in() check and drives the OOB/WARN paths with no race or other condition outside attacker control.\nPR:N - The attacker only needs to supply a malicious GFS2 volume (USB/media, disk image, or shared/SAN LUN) and needs no account on the target; CAP_SYS_ADMIN required to mount (gfs2 lacks FS_USERNS_MOUNT) belongs to the victim who mounts it.\nUI:R - Exploitation requires a privileged user or automount/storage path to mount the attacker-supplied GFS2 volume so gfs2_dinode_in()/stuffed readers run; the bug is not reachable without that mount or subsequent access of the crafted inode.\nS:U - Out-of-bounds reads and WARN/withdraw occur in the host kernel on the mounting node; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Oversized stuffed sizes make iomap_read_inline_data and especially gfs2_dir_read_stuffed() memcpy past the dinode buffer into adjacent page/kernel memory (e.g. EXHASH stuffed dirs with i_size matching BIT(i_depth)*8), which is an unbounded OOB read enabling kernel memory disclosure.\nI:N - The reachable primitive is an out-of-bounds read (and WARN/-EIO); pre-fix truncations in stuffed_readpage()/gfs2_unstuffer_page() still capped write/unstuff copies, so there is no OOB write or UAF write primitive from this defect alone.\nA:H - syzbot demonstrates WARN_ON_ONCE in iomap_read_inline_data during mount, which panics under panic_on_warn, and corrupt stuffed inodes can withdraw/fail the mount or oops on the OOB read path, fully denying availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/gfs2/aops.c", "fs/gfs2/bmap.c", "fs/gfs2/glops.c" ], "versions": [ { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "45df749f827c286adbc951f2a4865b67f0442ba9", "status": "affected", "versionType": "git" }, { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "4d4cb76636134bf9a0c9c3432dae936f99954586", "status": "affected", "versionType": "git" }, { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "7c414f6f06e9a3934901b6edc3177ae5a1e07094", "status": "affected", "versionType": "git" }, { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "46c9088cabd4d0469fdb61ac2a9c5003057fe94d", "status": "affected", "versionType": "git" }, { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "d458a0984429c2d47e60254f5bc4119cbafe83a2", "status": "affected", "versionType": "git" }, { "version": "b3b94faa5fe5968827ba0640ee9fba4b3e7f736e", "lessThan": "70376c7ff31221f1d21db5611d8209e677781d3a", "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/gfs2/aops.c", "fs/gfs2/bmap.c", "fs/gfs2/glops.c" ], "versions": [ { "version": "2.6.19", "status": "affected" }, { "version": "0", "lessThan": "2.6.19", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.280", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.240", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.177", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.93", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.11", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "2.6.19", "versionEndExcluding": "4.19.280" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.4.240" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.10.177" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.15.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.1.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/45df749f827c286adbc951f2a4865b67f0442ba9" }, { "url": "https://git.kernel.org/stable/c/4d4cb76636134bf9a0c9c3432dae936f99954586" }, { "url": "https://git.kernel.org/stable/c/7c414f6f06e9a3934901b6edc3177ae5a1e07094" }, { "url": "https://git.kernel.org/stable/c/46c9088cabd4d0469fdb61ac2a9c5003057fe94d" }, { "url": "https://git.kernel.org/stable/c/d458a0984429c2d47e60254f5bc4119cbafe83a2" }, { "url": "https://git.kernel.org/stable/c/70376c7ff31221f1d21db5611d8209e677781d3a" } ], "title": "gfs2: Always check inode size of inline inodes", "x_generator": { "engine": "bippy-1.2.0" } } } }