293 lines
16 KiB
JSON
293 lines
16 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-2024-49983",
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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": "2024-10-21T12:17:06.053Z",
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"datePublished": "2024-10-21T18:02:28.474Z",
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"dateUpdated": "2026-08-05T11:40:52.589Z"
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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": "2026-08-05T11:40:52.589Z"
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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\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\n\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\nthe 'ppath' is updated but it is the 'path' that is freed, thus potentially\ntriggering a double-free in the following process:\n\next4_ext_replay_update_ex\n ppath = path\n ext4_force_split_extent_at(&ppath)\n ext4_split_extent_at\n ext4_ext_insert_extent\n ext4_ext_create_new_leaf\n ext4_ext_grow_indepth\n ext4_find_extent\n if (depth > path[0].p_maxdepth)\n kfree(path) ---> path First freed\n *orig_path = path = NULL ---> null ppath\n kfree(path) ---> path double-free !!!\n\nSo drop the unnecessary ppath and use path directly to avoid this problem.\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\nmemory allocation and freeing. Also, propagate the error returned by\next4_find_extent() instead of using strange error codes."
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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 only entry point is `mount(2)` on a locally-attached block device holding an ext4 image whose journal carries an unreplayed fast-commit area; `ext4_ext_replay_update_ex()` has no callers outside `ext4_fc_replay_add_range()`, so there is no network- or adjacent-reachable path.\nAC:L - The attacker authors the entire image, so the extent-tree depth, the ADD_RANGE records and the corrupted extent block that makes the inner `ext4_find_extent()` fail are all chosen deterministically — no race and no memory-layout dependency outside attacker control, and standard slab grooming decides what reclaims the freed `kmalloc-N` object.\nPR:L - ext4 lacks `FS_USERNS_MOUNT` so `mount(2)` itself wants CAP_SYS_ADMIN, but an ordinary local user reaches the identical replay path by attaching removable media that udisks2/autofs mounts automatically, or via a `user` fstab entry — the standard crafted-ext4-image threat model on kiosks, workstations and embedded devices.\nUI:N - The attacker performs the mount themselves, either directly or by inserting media whose automount is unattended, so no action by a separate victim user is needed.\nS:U - The freed object, the stale dereferences and the corrupted slab freelist all live in the kernel's own memory and security authority; no hypervisor, IOMMU or sandbox boundary is crossed.\nC:H - `ext4_free_ext_path()` on the dangling pointer reads `p_depth` and every `p_bh` field back out of the already-freed, potentially reclaimed slab object, so attacker-groomed content is dereferenced as `struct buffer_head *` — a use-after-free read that yields arbitrary kernel-memory disclosure and kernel address leaks.\nI:H - The double `kfree()` corrupts the SLUB freelist, allowing the same chunk to be handed out twice and later overwritten, and the intervening `brelse()`/`put_bh()` decrements a refcount at an attacker-influenced address — together a controlled write primitive leveragable for control-flow hijack and privilege escalation.\nA:H - Even unexploited, a double-free plus dereference of freed `struct ext4_ext_path` entries reliably trips slab corruption detection or oopses in `brelse()` during mount, panicking the machine, and the mount can be repeated 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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"fs/ext4/extents.c"
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],
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"versions": [
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{
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"version": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "8c26d9e53e5fbacda0732a577e97c5a5b7882aaf",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "a34bed978364114390162c27e50fca50791c568d",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "6367d3f04c69e2b8770b8137bd800e0784b0abbc",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "1b558006d98b7b0b730027be0ee98973dd10ee0d",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "3ff710662e8d86a63a39b334e9ca0cb10e5c14b0",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "63adc9016917e6970fb0104ee5fd6770f02b2d80",
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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": "8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2",
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"lessThan": "5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95",
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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/ext4/extents.c"
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],
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"versions": [
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{
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"version": "5.10",
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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": "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": "5.10.227",
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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": "5.15.168",
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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": "6.1.113",
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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": "6.6.55",
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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": "6.10.14",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.3",
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"lessThanOrEqual": "6.11.*",
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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",
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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": "5.10",
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"versionEndExcluding": "5.10.227"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf"
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},
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{
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"url": "https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d"
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},
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{
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"url": "https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc"
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},
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{
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"url": "https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d"
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},
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{
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"url": "https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0"
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},
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{
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"url": "https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95"
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}
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],
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"title": "ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free",
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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-2024-49983",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-22T13:32:15.569255Z"
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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": "2024-10-22T13:38:44.023Z"
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}
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},
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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/2025/03/msg00002.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.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": "2025-11-03T22:24:05.400Z"
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}
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}
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]
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}
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} |