{"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"}}}}