{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43117","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:55.987Z","datePublished":"2026-05-06T07:40:41.862Z","dateUpdated":"2026-08-05T12:26:03.902Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:26:03.902Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()\n\nIf overlay is used on top of btrfs, dentry->d_sb translates to overlay's\nsuper block and fsid assignment will lead to a crash.\n\nUse file_inode(file)->i_sb to always get btrfs_sb."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable tracepoint is reachable through fsync/flush paths, and a severe reasonable deployment is an NFS/ksmbd-exported overlay filesystem backed by btrfs where a remote client can issue COMMIT/FLUSH into btrfs_sync_file(). Local fsync paths also reach it, but the network file-server path is the highest reasonable vector.\nAC:L - Once the btrfs_sync_file tracepoint/perf event is active, triggering the bug is a deterministic fsync/flush on an overlay-backed btrfs file with no race or timing requirement. Overlay-on-btrfs is a normal supported configuration.\nPR:N - A remote client can plausibly reach the fsync path through a guest or writable NFS/SMB export without privileges on the vulnerable host. When uncertain, the higher severity no-privilege scenario is defensible.\nUI:N - No victim action is needed after the filesystem/export/tracing environment exists; the attacker only sends or performs the fsync/flush operation. Mounting or tracing setup is environmental, not per-exploit user interaction.\nS:U - The impact is within the same kernel security authority and does not cross a hypervisor, IOMMU, or sandbox boundary. Standard kernel crash or kernel-memory exposure remains scope unchanged.\nC:H - The bug type-confuses an overlay superblock as btrfs_fs_info and copies through the bogus fs_devices pointer into trace/perf data. If the pointer resolves to valid kernel memory, this can expose kernel memory, so the higher severity confidentiality impact is selected.\nI:N - The vulnerable operations are invalid reads and writes only to the trace record buffer, not attacker-controlled writes to kernel objects. No direct integrity modification or control-flow overwrite was found.\nA:H - The fix commit explicitly states the bad fsid assignment can crash, and the invalid superblock/fs_devices dereference can oops or panic the kernel. This is high availability impact."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"],"versions":[{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"4a7bab35fad5251c8cb738161152578cd83b6b9c","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"520e8b4bcf872a534a7bf61ccf880047642df296","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"e252db8ca2a01f82d472091f35d549b313278636","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"c09a7446aab5773f38d6abb25fce99b8e1dfbc97","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"32372781d664a9b03c40343e96c29d0a6139f97d","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"d110d7cdb045715c0b45b0dfd974525bb38f653d","status":"affected","versionType":"git"},{"version":"bc074524e123ded281cde25ebc5661910f9679e3","lessThan":"a85b46db143fda5869e7d8df8f258ccef5fa1719","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"],"versions":[{"version":"4.8","status":"affected"},{"version":"0","lessThan":"4.8","status":"unaffected","versionType":"semver"},{"version":"5.10.258","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.136","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.83","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.24","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.14","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"4.8","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4a7bab35fad5251c8cb738161152578cd83b6b9c"},{"url":"https://git.kernel.org/stable/c/520e8b4bcf872a534a7bf61ccf880047642df296"},{"url":"https://git.kernel.org/stable/c/e252db8ca2a01f82d472091f35d549b313278636"},{"url":"https://git.kernel.org/stable/c/c09a7446aab5773f38d6abb25fce99b8e1dfbc97"},{"url":"https://git.kernel.org/stable/c/32372781d664a9b03c40343e96c29d0a6139f97d"},{"url":"https://git.kernel.org/stable/c/2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a"},{"url":"https://git.kernel.org/stable/c/d110d7cdb045715c0b45b0dfd974525bb38f653d"},{"url":"https://git.kernel.org/stable/c/a85b46db143fda5869e7d8df8f258ccef5fa1719"}],"title":"btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()","x_generator":{"engine":"bippy-1.2.0"}}}}