241 lines
13 KiB
JSON
241 lines
13 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-2025-22072",
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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": "2024-12-29T08:45:45.814Z",
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"datePublished": "2025-04-16T14:12:24.571Z",
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"dateUpdated": "2026-08-05T11:56:31.407Z"
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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": "2026-08-05T11:56:31.407Z"
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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\nspufs: fix gang directory lifetimes\n\nprior to \"[POWERPC] spufs: Fix gang destroy leaks\" we used to have\na problem with gang lifetimes - creation of a gang returns opened\ngang directory, which normally gets removed when that gets closed,\nbut if somebody has created a context belonging to that gang and\nkept it alive until the gang got closed, removal failed and we\nended up with a leak.\n\nUnfortunately, it had been fixed the wrong way. Dentry of gang\ndirectory was no longer pinned, and rmdir on close was gone.\nOne problem was that failure of open kept calling simple_rmdir()\nas cleanup, which meant an unbalanced dput(). Another bug was\nin the success case - gang creation incremented link count on\nroot directory, but that was no longer undone when gang got\ndestroyed.\n\nFix consists of\n\t* reverting the commit in question\n\t* adding a counter to gang, protected by ->i_rwsem\nof gang directory inode.\n\t* having it set to 1 at creation time, dropped\nin both spufs_dir_close() and spufs_gang_close() and bumped\nin spufs_create_context(), provided that it's not 0.\n\t* using simple_recursive_removal() to take the gang\ndirectory out when counter reaches zero."
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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 vulnerability is reached only through the local `spu_create()` syscall on a mounted spufs instance; there is no network, adjacent-network, or physical component to the attack.\nAC:L - The attacker deterministically forces the error path by exhausting their own fd table so `get_unused_fd_flags()` returns -EMFILE, making the unbalanced `dput()`/dentry kill occur on every attempt; the subsequent reallocation window is widened at will via heap spraying and CPU contention, both under attacker control.\nPR:L - Any unprivileged local user can trigger it — the gang-creation path contains no `capable()` check at all, and `spufs_create()` bypasses `may_create()`, so only traverse permission on the spufs root (granted by the default 0755 mode) is needed.\nUI:N - The attacker performs the entire sequence itself with a single `spu_create(..., SPU_CREATE_GANG, ...)` call; no action by any other user is required.\nS:U - The corruption is confined to kernel dcache structures within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The dentry is killed and RCU-freed while the caller still holds and uses the pointer, so reallocating the `dentry_cache` object lets the attacker have the kernel read and act on controlled `d_flags`, `d_op`, `d_inode` and `d_parent` fields, yielding kernel-memory disclosure primitives.\nI:H - The refcount underflow plus `dput()` on freed memory gives an arbitrary-decrement primitive and a path to `dentry->d_op->d_delete()` and `iput()`/`dput()` on forged pointers, i.e. control-flow hijack and privilege escalation.\nA:H - Even without reallocation the second `dput()` reliably triggers `WARN_ON_ONCE(d_lockref.count <= 0)` on a dead dentry and corrupts dcache/inode link accounting, causing an oops — a full panic on `panic_on_warn` systems — and the attack is repeatable at will."
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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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"arch/powerpc/platforms/cell/spufs/gang.c",
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"arch/powerpc/platforms/cell/spufs/inode.c",
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"arch/powerpc/platforms/cell/spufs/spufs.h"
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],
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"versions": [
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{
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"version": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "880e7b3da2e765c1f90c94c0539be039e96c7062",
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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": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "324f280806aab28ef757aecc18df419676c10ef8",
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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": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "029d8c711f5e5fe8cf63e8a4a1a140a06e224e45",
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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": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "903733782f3ae28a2f7fe4dfb47c7fe3e079a528",
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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": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "fc646a6c6d14b5d581f162a7e32999f789e3a3ac",
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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": "877907d37da9694a34adc9dc3e2ce09400148cb5",
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"lessThan": "c134deabf4784e155d360744d4a6a835b9de4dd4",
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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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"arch/powerpc/platforms/cell/spufs/gang.c",
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"arch/powerpc/platforms/cell/spufs/inode.c",
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"arch/powerpc/platforms/cell/spufs/spufs.h"
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],
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"versions": [
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{
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"version": "2.6.22",
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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": "2.6.22",
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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": "6.1.134",
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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": "6.6.87",
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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": "6.12.23",
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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": "6.13.11",
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"lessThanOrEqual": "6.13.*",
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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": "6.14.2",
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"lessThanOrEqual": "6.14.*",
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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",
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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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"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": "2.6.22",
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"versionEndExcluding": "6.1.134"
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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": "2.6.22",
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"versionEndExcluding": "6.6.87"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/880e7b3da2e765c1f90c94c0539be039e96c7062"
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},
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{
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"url": "https://git.kernel.org/stable/c/324f280806aab28ef757aecc18df419676c10ef8"
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},
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{
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"url": "https://git.kernel.org/stable/c/029d8c711f5e5fe8cf63e8a4a1a140a06e224e45"
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},
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{
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"url": "https://git.kernel.org/stable/c/903733782f3ae28a2f7fe4dfb47c7fe3e079a528"
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},
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{
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"url": "https://git.kernel.org/stable/c/fc646a6c6d14b5d581f162a7e32999f789e3a3ac"
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},
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{
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"url": "https://git.kernel.org/stable/c/c134deabf4784e155d360744d4a6a835b9de4dd4"
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}
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],
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"title": "spufs: fix gang directory lifetimes",
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:41:52.282Z"
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}
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}
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]
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}
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} |