264 lines
14 KiB
JSON
264 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-2026-93262",
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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": "2026-09-17T16:02:15.097Z",
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"datePublished": "2026-09-24T15:52:01.886Z",
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"dateUpdated": "2026-10-19T09:08:15.484Z"
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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": "2026-10-19T09:08:15.484Z"
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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\nmd/raid5-ppl: fix use-after-free in ppl_do_flush()\n\nThe loop in ppl_do_flush() continues iterating after calling\nppl_io_unit_finished(), touching io->pending_flushes and leading to a\nuse-after-free.\n\nAdd a break statement to stop the loop once io is freed."
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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 patched ppl_do_flush() runs from ppl_stripe_write_finished() after RAID5 stripe data+parity I/O completes. Those writes enter via md_submit_bio() -> raid5_make_request() from local write(2) to a filesystem or /dev/md*; ppl_submit_iounit() only sets disk_flush_bitmap from local stripe R5_Wantwrite/wb_cache_on state, not from a network protocol message.\nAC:L - Writes the attacker issues are logged by ppl_write_stripe()/ppl_log_stripe() and ppl_submit_iounit() sets disk_flush_bitmap for child_logs[i].wb_cache_on members. When pending_stripes hits 0, ppl_stripe_write_finished() calls ppl_do_flush(); the remainder loop's missing break after ppl_io_unit_finished() is a logic bug on that path, not a second-actor race or a disk-fault precondition.\nPR:L - md_submit_bio() and raid5_make_request() have no capability check; md_ioctl()'s capable(CAP_SYS_ADMIN) applies only to array-management ioctls, not I/O. An unprivileged user who can write a filesystem on the RAID5+PPL array (or /dev/md* with disk-group write access) reaches ppl_do_flush() without init-namespace root.\nUI:N - The attacker triggers ppl_do_flush() through their own writes: raid5 handle_stripe()/handle_stripe_clean_event() calls ppl_stripe_write_finished() on I/O they submitted. No victim action such as mounting an image or plugging a device is required.\nS:U - ppl_io_unit_finished() mempool_free()s the ppl_io_unit from ppl_conf->io_pool in the host md/raid5 kernel. The later dangling atomic_dec_and_test(&io->pending_flushes) in ppl_do_flush() stays in that kernel's authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ppl_io_unit_finished() returns the ppl_io_unit to io_pool via mempool_free(); ppl_do_flush()'s remainder loop then does atomic_dec_and_test(&io->pending_flushes) on that freed kmem_cache object. A UAF of the recycled io_unit header is a kernel read primitive against adjacent/reconstituted pool memory.\nI:H - The same dangling io is a writeable ppl_io_unit: atomic_dec_and_test() mutates pending_flushes on a recycled object, and another true dec_and_test would call ppl_io_unit_finished() again (list_del/mempool_free of a live unit). That is a kernel write/double-free primitive on the PPL io_unit cache.\nA:H - Use-after-free of the mempool ppl_io_unit in ppl_do_flush() after ppl_io_unit_finished() can oops on the stale pending_flushes access or corrupt list_del() pointers in a second finish, panicking the host."
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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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"drivers/md/raid5-ppl.c"
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],
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"versions": [
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{
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"version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "cf01f9413565e86673baf927291a088b6975692b",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "e7505842f1329ece90cb9ea0db87772aeca44052",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "b5123bf667ac29ddd8106f9ca7cc01316513ae66",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "e77c80670f2c2bf491da9b173931e1da4677c23a",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "8914c3d40870f16429a326e97e4016bedc6ede4c",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "455b56209f9615c3902dcc398dd867abb5ade3ab",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "fcf21df7d3c50c8ebeb0757df5d21b02dcae4218",
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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": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
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"lessThan": "371f7a1b392edc8b7cf449cc7713179b588f2d0e",
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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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"drivers/md/raid5-ppl.c"
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],
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"versions": [
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{
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"version": "4.16",
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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": "4.16",
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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": "5.10.270",
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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": "5.15.221",
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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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{
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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": "4.16",
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"versionEndExcluding": "5.10.270"
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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": "4.16",
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"versionEndExcluding": "6.6.157"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cf01f9413565e86673baf927291a088b6975692b"
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},
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{
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"url": "https://git.kernel.org/stable/c/e7505842f1329ece90cb9ea0db87772aeca44052"
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},
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{
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"url": "https://git.kernel.org/stable/c/b5123bf667ac29ddd8106f9ca7cc01316513ae66"
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},
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{
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"url": "https://git.kernel.org/stable/c/e77c80670f2c2bf491da9b173931e1da4677c23a"
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},
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{
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"url": "https://git.kernel.org/stable/c/8914c3d40870f16429a326e97e4016bedc6ede4c"
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},
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{
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"url": "https://git.kernel.org/stable/c/455b56209f9615c3902dcc398dd867abb5ade3ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/fcf21df7d3c50c8ebeb0757df5d21b02dcae4218"
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},
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{
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"url": "https://git.kernel.org/stable/c/371f7a1b392edc8b7cf449cc7713179b588f2d0e"
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}
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],
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"title": "md/raid5-ppl: fix use-after-free in ppl_do_flush()",
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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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}
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} |