300 lines
17 KiB
JSON
300 lines
17 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-2025-38710",
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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": "2025-04-16T04:51:24.033Z",
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"datePublished": "2025-09-04T15:33:00.629Z",
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"dateUpdated": "2026-10-15T22:02:28.235Z"
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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": "2026-08-05T12:04:10.498Z"
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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\ngfs2: Validate i_depth for exhash directories\n\nA fuzzer test introduced corruption that ends up with a depth of 0 in\ndir_e_read(), causing an undefined shift by 32 at:\n\n index = hash >> (32 - dip->i_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is\ninvalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time.\n\nSo we can avoid the undefined behaviour by checking for depth values\nlower than the minimum in gfs2_dinode_in(). Values greater than the\nmaximum are already being checked for there.\n\nAlso switch the calculation in dir_make_exhash() to use ilog2() to\nclarify how the depth is calculated.\n\nTested with the syzkaller repro.c and xfstests '-g quick'."
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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:L/UI:N/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 corrupt `di_depth` reaches the kernel only by mounting an attacker-crafted GFS2 volume (loop device, removable media, or a shared cluster LUN), after which the flaw is triggered by ordinary local syscalls (`open`/`stat`/`getdents`) on that mount. GFS2 is a shared-disk filesystem with no network-protocol front end, so there is no remote parser path.\nAC:L - The condition is a deterministic inconsistency the attacker fully authors on disk (`GFS2_DIF_EXHASH` set, `di_depth = 0`, `di_size = 8`), and the out-of-bounds index is chosen exactly by picking a filename whose CRC32 hash equals the desired 32-bit offset. No race, no timing window, and no memory-layout condition outside the attacker's control.\nPR:L - The bare `mount(2)` needs CAP_SYS_ADMIN (gfs2 lacks FS_USERNS_MOUNT), but in the most severe reasonable deployment an unprivileged user gets the crafted volume mounted through udisks2 loop-setup/removable-media automount or `user`/autofs fstab delegation, and the trigger itself — a path lookup or `getdents` on the bad directory — requires only basic unprivileged access to the mount.\nUI:N - In the automount/loop-setup scenario the attacker presents the media and initiates the mount themselves, and at the point of exploitation the out-of-bounds read fires from the attacker's own `open()`/`stat()` call. No second user has to take any action.\nS:U - The out-of-bounds access, the wild block read, and the hang all occur in GFS2 code inside the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - `get_leaf_nr()` reads a 64-bit word at `hash + 8*index` where `index` is a fully attacker-chosen 32-bit value and the allocation is 8 bytes — an unbounded slab out-of-bounds read reaching up to 32 GiB past the object, far beyond a \"few bytes\" bounded read. The value read becomes a block number handed to `gfs2_meta_read()`, giving an observable oracle on kernel heap contents through lookup success/failure and the resulting I/O.\nI:H - Out-of-bounds heap data is promoted to a filesystem block number, and `dir_new_leaf()`/`gfs2_dir_add()` then write directory metadata (`oleaf->lf_next`, `be16_add_cpu(&leaf->lf_entries, 1)`) into the buffer for that attacker-influenced block, so kernel-side data read past the object's bounds steers subsequent metadata writes to arbitrary blocks of the device — including a shared cluster LUN.\nA:H - A read up to 32 GiB past an 8-byte slab object will typically strike unmapped memory and produce a kernel oops/page fault (KASAN reports it as slab-out-of-bounds), and `dir_e_read()` independently spins forever because `len` truncates to 0 so `index` never advances, wedging `getdents()` while holding the directory glock and stalling the mount — a full panic on `panic_on_oops` configurations, repeatable on demand."
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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/gfs2/dir.c",
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"fs/gfs2/glops.c"
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],
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"versions": [
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{
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"version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "076e992752e4b24178918f748d75597c80a408d2",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "366183911b153e9b8cf758e1414e1154d7569337",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "112bb60cd0e254a369e95aa9941a694ffeca089f",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "cddea0c721106ea480371412d8de21705eb27376",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "53a0249d68a210c16e961b83adfa82f94ee0a53d",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "b5f46951e62377b6e406fadc18bc3c5bdf1632a7",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "9680c58675b82348ab84d387e4fa727f7587e1a0",
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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": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
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"lessThan": "557c024ca7250bb65ae60f16c02074106c2f197b",
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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/gfs2/dir.c",
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"fs/gfs2/glops.c"
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],
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"versions": [
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{
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"version": "2.6.26",
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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": "2.6.26",
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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": "5.10.258",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.209",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.175",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.134",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.43",
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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": "6.15.11",
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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": "6.16.2",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.26",
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"versionEndExcluding": "5.10.258"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/076e992752e4b24178918f748d75597c80a408d2"
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},
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{
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"url": "https://git.kernel.org/stable/c/366183911b153e9b8cf758e1414e1154d7569337"
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},
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{
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"url": "https://git.kernel.org/stable/c/112bb60cd0e254a369e95aa9941a694ffeca089f"
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},
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{
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"url": "https://git.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376"
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},
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{
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"url": "https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d"
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},
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{
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"url": "https://git.kernel.org/stable/c/b5f46951e62377b6e406fadc18bc3c5bdf1632a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b"
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}
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],
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"title": "gfs2: Validate i_depth for exhash directories",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-38710",
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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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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:52:51.698031Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:28.235Z"
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}
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}
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]
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}
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} |