{ "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" } } } }