243 lines
14 KiB
JSON
243 lines
14 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-2026-89786",
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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": "2026-09-11T19:38:34.766Z",
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"datePublished": "2026-09-16T08:48:23.730Z",
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"dateUpdated": "2026-10-19T08:52:39.655Z"
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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": "2026-10-19T08:52:39.655Z"
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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: fix out-of-bounds read in ext4_read_inline_dir()\n\next4_read_inline_dir() can read a dirent header past the end of its inline\nbuffer, triggering a slab-out-of-bounds read during getdents64():\n\n BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry\n Read of size 2 at addr ffff88800f3dd23c by task exploit/148\n ...\n __ext4_check_dir_entry\n ext4_read_inline_dir\n iterate_dir\n\nThe dirent payload lives in a buffer of exactly inline_size bytes:\n\n\tdir_buf = kmalloc(inline_size, GFP_NOFS);\n\nbut iteration runs in a position space extra_offset bytes larger\n(extra_size = extra_offset + inline_size) so the synthetic \".\" and \"..\"\nland at their block-dir offsets. A dirent is formed at \"dir_buf + pos -\nextra_offset\", yet the ext4_check_dir_entry() length argument uses the\nlarger extra_size. A position whose dirent header would extend past\nextra_size is therefore accepted, and the rescan loop's rec_len probe and\next4_check_dir_entry() dereference de->rec_len before the entry is rejected.\n\nReject a position whose minimum-size dirent header would not fit within\nextra_size before forming de, in both the rescan and main loops, and pass\ninline_size rather than extra_size to ext4_check_dir_entry() so the length\ncheck matches the physical buffer."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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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:N - The slab OOB is in ext4_read_inline_dir(), reached from getdents64 via iterate_dir→ext4_readdir. nfsd_readdir does vfs_llseek plus iterate_dir, and ksmbd QUERY_DIRECTORY also calls iterate_dir, so a remote NFS/SMB client can trigger the same path on an ext4-backed export.\nAC:L - A crafted inline directory with attacker-controlled rec_len values (or a seek/NFS cookie that lands ctx->pos near extra_size) deterministically forms a dirent past kmalloc(inline_size) and dereferences de->rec_len. No race or attacker-uncontrollable heap layout is required.\nPR:N - READDIR on a guest/anonymous ksmbd share or AUTH_SYS NFS export needs no host account or capability. Automount of a malicious volume by udisks2/systemd also requires no attacker privileges on the victim.\nUI:N - Once the crafted or inline-data ext4 volume is exported or automounted, the attacker alone issues NFS/SMB READDIR or local getdents64. No separate victim must open a file or confirm a dialog at attack time.\nS:U - The out-of-bounds read and any resulting kernel crash stay within the host kernel's security authority. This is not a VM escape, IOMMU/DMA bypass, or other cross-boundary breakout.\nC:H - ext4_check_dir_entry over-reads de->rec_len and adjacent dirent fields past the inline kmalloc buffer. If the inflated extra_size bound lets the check pass, dir_emit copies de->name for up to 255 bytes of adjacent kernel heap into the getdents/NFS/SMB reply.\nI:N - The defect is an over-read on the readdir path only. ext4_read_inline_dir does not write the over-read dirent, and there is no out-of-bounds write, type confusion, or control-flow hijack primitive.\nA:H - KASAN reports a slab-out-of-bounds read in __ext4_check_dir_entry. An over-read that reaches unmapped slab or guard pages oopses or panics the kernel, and the attacker can repeat READDIR/getdents against the crafted directory."
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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/inline.c"
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],
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"versions": [
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{
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"version": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "d1e7c186555ad65554fd2f2b02f5a539aa35ae48",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "1a1dea633b724a1c042dbcdb1fed27f410916688",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "b060861f662d4826dc700a1c3584243bb3474cfe",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "6702c7da86d8cdb88d0fc57166286e115ffeb8c0",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "36bf17bb90cdf7a623499b624b05acde4d2feef5",
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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": "c4d8b0235aa98f8c26bf94d308be3fdd24154572",
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"lessThan": "9333cc809f0a89e001b814155a6cb8903a6274df",
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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/inline.c"
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],
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"versions": [
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{
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"version": "3.10",
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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": "3.10",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.10",
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"versionEndExcluding": "5.15.221"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d1e7c186555ad65554fd2f2b02f5a539aa35ae48"
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},
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{
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"url": "https://git.kernel.org/stable/c/5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f"
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},
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{
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"url": "https://git.kernel.org/stable/c/1a1dea633b724a1c042dbcdb1fed27f410916688"
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{
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"url": "https://git.kernel.org/stable/c/b060861f662d4826dc700a1c3584243bb3474cfe"
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},
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{
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"url": "https://git.kernel.org/stable/c/6702c7da86d8cdb88d0fc57166286e115ffeb8c0"
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},
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{
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"url": "https://git.kernel.org/stable/c/36bf17bb90cdf7a623499b624b05acde4d2feef5"
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},
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{
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"url": "https://git.kernel.org/stable/c/9333cc809f0a89e001b814155a6cb8903a6274df"
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}
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],
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"title": "ext4: fix out-of-bounds read in ext4_read_inline_dir()",
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"x_generator": {
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