{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49167","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T01:49:39.278Z","datePublished":"2025-02-26T01:55:26.030Z","dateUpdated":"2026-08-05T08:54:11.254Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:54:11.254Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not double complete bio on errors during compressed reads\n\nI hit some weird panics while fixing up the error handling from\nbtrfs_lookup_bio_sums().  Turns out the compression path will complete\nthe bio we use if we set up any of the compression bios and then return\nan error, and then btrfs_submit_data_bio() will also call bio_endio() on\nthe bio.\n\nFix this by making btrfs_submit_compressed_read() responsible for\ncalling bio_endio() on the bio if there are any errors.  Currently it\nwas only doing it if we created the compression bios, otherwise it was\ndepending on btrfs_submit_data_bio() to do the right thing.  This\ncreates the above problem, so fix up btrfs_submit_compressed_read() to\nalways call bio_endio() in case of an error, and then simply return from\nbtrfs_submit_data_bio() if we had to call\nbtrfs_submit_compressed_read()."}],"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 btrfs compressed buffered-read submission (read → extent_io → submit_one_bio → btrfs_submit_data_bio → btrfs_submit_compressed_read), reachable only via local VFS reads of compressed extents on a mounted btrfs filesystem, not via network protocol handlers.\nAC:L - An attacker who can read compressed files can drive the finish_cb error path (e.g., by inducing ENOMEM in btrfs_lookup_bio_sums/alloc_compressed_bio after pages are allocated); no victim-controlled race or rare non-default config is required.\nPR:L - An unprivileged local user can create compressed files (mount compress= or chattr +c) and read them on an already-mounted btrfs volume; no real root or init-namespace admin capability is required.\nUI:N - Exploitation needs no separate victim action once btrfs is mounted; the attacker triggers the path by reading their own compressed files (and optionally stressing memory).\nS:U - Impact stays within the local kernel/OS security authority (standard kernel memory corruption / DoS); there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Double bio_endio after end_bio_extent_readpage's bio_put is a use-after-free of the bio (bioset object), which per UAF guidance enables reclaim and arbitrary read primitives.\nI:H - The same bio UAF/double-free, plus re-entry into page unlock/extent-release paths on already-completed state, is memory corruption that can be leveraged for write primitives and control-flow hijacking.\nA:H - The author observed kernel panics from the double completion; UAF/double bio_put and double page unlock reliably cause oops/panic or equivalent denial of service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/compression.c","fs/btrfs/inode.c"],"versions":[{"version":"86ccbb4d2a2af4109430df518c995a4f7d14dfd2","lessThan":"4a4ceb2b990771c374d85d496a1a45255dde48e3","status":"affected","versionType":"git"},{"version":"86ccbb4d2a2af4109430df518c995a4f7d14dfd2","lessThan":"987b5df1d10355d377315a26e7fb6c72ded83c9f","status":"affected","versionType":"git"},{"version":"86ccbb4d2a2af4109430df518c995a4f7d14dfd2","lessThan":"f9f15de85d74e7eef021af059ca53a15f041cdd8","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/btrfs/compression.c","fs/btrfs/inode.c"],"versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"5.16.19","lessThanOrEqual":"5.16.*","status":"unaffected","versionType":"semver"},{"version":"5.17.2","lessThanOrEqual":"5.17.*","status":"unaffected","versionType":"semver"},{"version":"5.18","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":"5.16","versionEndExcluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4a4ceb2b990771c374d85d496a1a45255dde48e3"},{"url":"https://git.kernel.org/stable/c/987b5df1d10355d377315a26e7fb6c72ded83c9f"},{"url":"https://git.kernel.org/stable/c/f9f15de85d74e7eef021af059ca53a15f041cdd8"}],"title":"btrfs: do not double complete bio on errors during compressed reads","x_generator":{"engine":"bippy-1.2.0"}}}}