194 lines
9.7 KiB
JSON
194 lines
9.7 KiB
JSON
{
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"cveId": "CVE-2024-41086",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.634Z",
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"datePublished": "2024-07-29T15:48:02.175Z",
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"dateUpdated": "2026-08-05T11:35:16.451Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: Fix sb_field_downgrade validation\n\n- bch2_sb_downgrade_validate() wasn't checking for a downgrade entry\n extending past the end of the superblock section\n\n- for_each_downgrade_entry() is used in to_text() and needs to work on\n malformed input; it also was missing a check for a field extending\n past the end of the section"
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"metrics": [
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is triggered by parsing a crafted bcachefs superblock from an attached block device (USB stick, loop-mounted image, or attached storage) during mount, which requires local presentation of the malicious filesystem rather than any network path.\nAC:L - The attacker fully controls every input — the `nr_errors` field, the entry's major version that forces the validation failure into `to_text()`, and the superblock checksum — so the out-of-bounds read is triggered deterministically on every mount attempt.\nPR:N - Authoring the malicious filesystem image requires no privileges on the target system whatsoever; the attacker only needs to supply the image, and the mounting privilege belongs to the victim, not the attacker.\nUI:R - A user or administrator must mount the crafted image (or insert removable media that a desktop auto-mounter mounts) for `bch2_read_super()` to reach the vulnerable loop.\nS:U - The out-of-bounds read and its consequences are confined to the kernel's own memory and the kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~128 KB of kernel heap beyond the superblock slab allocation is read and each `u16` is decoded into an exact error-string name when below `BCH_SB_ERR_MAX`, disclosing adjacent heap contents through the kernel log — far beyond a strictly bounded few-byte read.\nI:H - Out-of-bounds heap values flow into `__set_bit(e, c->sb.errors_silent)` in `bch2_sb_set_downgrade()`, silently suppressing filesystem consistency error detection during recovery, and the unvalidated malformed section reaches the superblock write-back path, corrupting on-disk metadata handling.\nA:H - The slab-out-of-bounds read reported by syzbot panics KASAN/hardened kernels immediately, and a wild ~32-page read plus a multi-megabyte printbuf expansion can oops or exhaust memory on production kernels."
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}
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]
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}
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],
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{
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/bcachefs/sb-downgrade.c"
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],
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{
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"version": "84f1638795da1ff2084597de4251e9054f1ad728",
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"fs/bcachefs/sb-downgrade.c"
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],
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"version": "6.7",
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"status": "affected"
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{
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"version": "0",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.9.8",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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"version": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"title": "bcachefs: Fix sb_field_downgrade validation",
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"id": "CVE-2024-41086",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"timestamp": "2024-09-10T16:20:49.092454Z"
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