{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50328", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T14:18:36.815Z", "datePublished": "2025-09-15T14:49:30.483Z", "dateUpdated": "2026-08-05T08:58:12.098Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:12.098Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix potential use-after-free in jbd2_fc_wait_bufs\n\nIn 'jbd2_fc_wait_bufs' use 'bh' after put buffer head reference count\nwhich may lead to use-after-free.\nSo judge buffer if uptodate before put buffer head reference count." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in jbd2_fc_wait_bufs on the ext4 fast-commit path, reached via local syscalls such as fsync/fdatasync/fallocate(O_SYNC) on an ext4 filesystem; it does not process network packets or remote protocol data.\nAC:L - An unprivileged attacker can reliably drive the vulnerable path by dirtying and fsyncing files on a fast-commit-enabled ext4 mount, and can apply memory pressure so the buffer_head dropped by put_bh is reclaimed before buffer_uptodate; both sides of the race are attacker-influenced.\nPR:L - Any unprivileged local user with write access to a regular file on a mounted ext4 filesystem with the fast_commit feature can trigger ext4_fc_commit → jbd2_fc_wait_bufs; no capabilities or root are required.\nUI:N - Exploitation uses only the attacker's own file writes and fsync; no separate victim action such as mounting a volume or opening a crafted file is required.\nS:U - This is a standard in-kernel heap use-after-free that can escalate privileges within the same kernel authority, not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - Use-after-free of the buffer_head after put_bh lets an attacker reclaim and control the freed object, enabling arbitrary kernel memory disclosure primitives per UAF exploitation.\nI:H - UAF of the buffer_head enables heap spraying and write primitives for control-flow hijacking, and a corrupted buffer_uptodate result can also cause failed journal IO to be treated as success.\nA:H - Accessing the freed buffer_head can oops/panic the kernel even without full exploitation, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/jbd2/journal.c" ], "versions": [ { "version": "ff780b91efe901b8eecd8114785abae5341820ad", "lessThan": "1d4d16daec2a6689b6d3fbfc7d2078643adc6619", "status": "affected", "versionType": "git" }, { "version": "ff780b91efe901b8eecd8114785abae5341820ad", "lessThan": "d11d2ded293976a1a0d9d9471827a44dc9e3c63f", "status": "affected", "versionType": "git" }, { "version": "ff780b91efe901b8eecd8114785abae5341820ad", "lessThan": "2e6d9f381c1ed844531a577783fc352de7a44c8a", "status": "affected", "versionType": "git" }, { "version": "ff780b91efe901b8eecd8114785abae5341820ad", "lessThan": "effd9b3c029ecdd853a11933dcf857f5a7ca8c3d", "status": "affected", "versionType": "git" }, { "version": "ff780b91efe901b8eecd8114785abae5341820ad", "lessThan": "243d1a5d505d0b0460c9af0ad56ed4a56ef0bebd", "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/jbd2/journal.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.10", "versionEndExcluding": "5.10.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1d4d16daec2a6689b6d3fbfc7d2078643adc6619" }, { "url": "https://git.kernel.org/stable/c/d11d2ded293976a1a0d9d9471827a44dc9e3c63f" }, { "url": "https://git.kernel.org/stable/c/2e6d9f381c1ed844531a577783fc352de7a44c8a" }, { "url": "https://git.kernel.org/stable/c/effd9b3c029ecdd853a11933dcf857f5a7ca8c3d" }, { "url": "https://git.kernel.org/stable/c/243d1a5d505d0b0460c9af0ad56ed4a56ef0bebd" } ], "title": "jbd2: fix potential use-after-free in jbd2_fc_wait_bufs", "x_generator": { "engine": "bippy-1.2.0" } } } }