159 lines
9.9 KiB
JSON
159 lines
9.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38172",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.991Z",
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"datePublished": "2025-07-03T08:36:10.334Z",
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"dateUpdated": "2026-08-05T12:00:03.095Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:00:03.095Z"
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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\nerofs: avoid using multiple devices with different type\n\nFor multiple devices, both primary and extra devices should be the\nsame type. `erofs_init_device` has already guaranteed that if the\nprimary is a file-backed device, extra devices should also be\nregular files.\n\nHowever, if the primary is a block device while the extra device\nis a file-backed device, `erofs_init_device` will get an ENOTBLK,\nwhich is not treated as an error in `erofs_fc_get_tree`, and that\nleads to an UAF:\n\n erofs_fc_get_tree\n get_tree_bdev_flags(erofs_fc_fill_super)\n erofs_read_superblock\n erofs_init_device // sbi->dif0 is not inited yet,\n // return -ENOTBLK\n deactivate_locked_super\n free(sbi)\n if (err is -ENOTBLK)\n sbi->dif0.file = filp_open() // sbi UAF\n\nSo if -ENOTBLK is hitted in `erofs_init_device`, it means the\nprimary device must be a block device, and the extra device\nis not a block device. The error can be converted to -EINVAL."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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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 reached only through the local mount(2)/fsconfig(2)+fsmount(2) filesystem-mount path on an erofs image plus its `device=` parameters; there is no network-facing consumer of this code.\nAC:L - The trigger is fully deterministic — an erofs image whose on-disk device table count matches the supplied `device=` options, with one such path naming a regular file instead of a block device, reliably yields -ENOTBLK and the use-after-free write on every attempt. Heap reuse of the freed `erofs_sb_info` is attacker-assisted because the free→write window spans an attacker-influenceable `filp_open()` path walk that can be stalled arbitrarily, and the spray runs from the attacker's own threads.\nPR:N - The attacker needs no account or capability on the target: they only supply the malicious erofs image and/or arrange the `device=` path (which is resolved with symlink following at fill_super time, in directories such as container blob/staging dirs) to be a non-block file, while a privileged mounter — automounter, container/composefs runtime, or mount helper handling multi-device erofs images — performs the mount. This matches the kernel CNA treatment of crafted-image mount bugs (e.g. CVE-2025-38204, CVE-2025-38230, CVE-2025-38652).\nUI:R - The flaw only fires when someone mounts the attacker-supplied erofs image with the corresponding `device=` parameters; it cannot be triggered without that mount action.\nS:U - The freed object, the corrupted slab memory, and the resulting crash or escalation are all inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `file_inode(sbi->dif0.file)->i_mode` is read back out of the freed `erofs_sb_info`; if a sprayed object has taken the slot the kernel dereferences an attacker-groomed pointer and reads memory at an attacker-chosen location, and use-after-free of a kmalloc object is generally leverageable into kernel-memory disclosure.\nI:H - `sbi->dif0.file = file` writes a valid kernel `struct file *` at a fixed offset (16) into a freed generic-kmalloc chunk, clobbering whatever live object has been reallocated there — a classic UAF write primitive that overwrites pointers/state of an unrelated kernel object and is a strong stepping stone to control-flow hijacking.\nA:H - Even without grooming, the UAF read of poisoned/reused memory and the follow-on `get_tree_nodev()` path (which calls `erofs_fc_fill_super()` with `s_fs_info == NULL`, immediately writing through a NULL `sbi`) produce a kernel oops/panic, and the path also leaks a `struct file` reference on every attempt."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "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/erofs/super.c"
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],
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"versions": [
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{
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"version": "fb176750266a3d7f42ebdcf28e8ba40350b27847",
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"lessThan": "65115472f741ca000d7ea4a5922214f93cd1516e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fb176750266a3d7f42ebdcf28e8ba40350b27847",
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"lessThan": "cd04beb9ce2773a16057248bb4fa424068ae3807",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fb176750266a3d7f42ebdcf28e8ba40350b27847",
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"lessThan": "9748f2f54f66743ac77275c34886a9f890e18409",
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"status": "affected",
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"versionType": "git"
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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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"vendor": "Linux",
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"defaultStatus": "affected",
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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/erofs/super.c"
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],
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"versions": [
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{
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"version": "6.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.34",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.15.3",
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"lessThanOrEqual": "6.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16",
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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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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.12.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.15.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.16"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/65115472f741ca000d7ea4a5922214f93cd1516e"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd04beb9ce2773a16057248bb4fa424068ae3807"
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},
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{
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"url": "https://git.kernel.org/stable/c/9748f2f54f66743ac77275c34886a9f890e18409"
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}
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],
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"title": "erofs: avoid using multiple devices with different type",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |