{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-22114","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-29T08:45:45.823Z","datePublished":"2025-04-16T14:12:59.898Z","dateUpdated":"2026-08-05T11:56:51.717Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:56:51.717Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don't clobber ret in btrfs_validate_super()\n\nCommit 2a9bb78cfd36 (\"btrfs: validate system chunk array at\nbtrfs_validate_super()\") introduces a call to validate_sys_chunk_array()\nin btrfs_validate_super(), which clobbers the value of ret set earlier.\nThis has the effect of negating the validity checks done earlier, making\nit so btrfs could potentially try to mount invalid filesystems."}],"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 vulnerability is reached by mounting a crafted btrfs image via the mount(2) path (open_ctree → btrfs_validate_mount_super), requiring local system access. Desktop distros brokering loop-device setup and mounting to active local sessions through udisks2/polkit make this a genuine local (not merely physical) path, alongside removable-media automount on kiosks and shared workstations.\nAC:L - The entire image is crafted deterministically offline — a valid superblock checksum, a legitimate 65+ byte sys_chunk_array so validate_sys_chunk_array() returns 0 and clobbers ret, sectorsize=4096 to satisfy alignment checks, and nodesize=1 MiB to overflow the 16-entry page/folio arrays. There is no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:L - On default desktop configurations an unprivileged local user in an active session can create a loop device and mount an arbitrary filesystem image through udisks2/polkit without additional authentication, and containers or fstab \"user\" entries provide equivalent paths. No real root in the init namespace is needed.\nUI:N - In the loop-device scenario the attacker performs the mount themselves; no separate victim has to open a file, click a prompt, or take any action.\nS:U - The corruption occurs in kernel memory during filesystem mount and is confined to the kernel's own security authority — there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The bypassed nodesize check yields an extent_buffer whose len vastly exceeds its backing storage, giving out-of-bounds reads of kernel memory, and BTRFS_MAX_ITEM_SIZE/csums_per_leaf underflow to enormous values; the bypassed fsid/metadata_uuid/dev_item.fsid checks additionally let a crafted device impersonate another filesystem. The resulting heap and stack corruption is leverageable for arbitrary kernel memory disclosure.\nI:H - btrfs_alloc_page_array() writes an attacker-chosen number of struct page pointers past a 16-entry on-stack array and past the extent_buffer slab object, an out-of-bounds write primitive exploitable for control-flow hijack. The same clobber also defeats btrfs_validate_write_super(), permitting corrupt superblocks to be committed to disk.\nA:H - The overflow reliably panics the kernel — via BUG() from the ASSERT where CONFIG_BTRFS_ASSERT is set, via stack-protector panic, or via oops from the nonsensical geometry (invalid sectorsize_bits shifts, zero/oversized nodesize) propagated throughout the mounted filesystem."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/disk-io.c"],"versions":[{"version":"2a9bb78cfd367fdeff74f15b1e98969912292d9e","lessThan":"ef6800a2015e706e9852a5ec15263fec9990d012","status":"affected","versionType":"git"},{"version":"2a9bb78cfd367fdeff74f15b1e98969912292d9e","lessThan":"9db9c7dd5b4e1d3205137a094805980082c37716","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/disk-io.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.14.2","lessThanOrEqual":"6.14.*","status":"unaffected","versionType":"semver"},{"version":"6.15","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":"6.14","versionEndExcluding":"6.14.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ef6800a2015e706e9852a5ec15263fec9990d012"},{"url":"https://git.kernel.org/stable/c/9db9c7dd5b4e1d3205137a094805980082c37716"}],"title":"btrfs: don't clobber ret in btrfs_validate_super()","x_generator":{"engine":"bippy-1.2.0"}}}}