224 lines
13 KiB
JSON
224 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-2023-53536",
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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": "2025-10-04T15:14:15.919Z",
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"datePublished": "2025-10-04T15:16:47.304Z",
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"dateUpdated": "2026-08-05T09:14:40.430Z"
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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": "2026-08-05T09:14:40.430Z"
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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\nblk-crypto: make blk_crypto_evict_key() more robust\n\nIf blk_crypto_evict_key() sees that the key is still in-use (due to a\nbug) or that ->keyslot_evict failed, it currently just returns while\nleaving the key linked into the keyslot management structures.\n\nHowever, blk_crypto_evict_key() is only called in contexts such as inode\neviction where failure is not an option. So actually the caller\nproceeds with freeing the blk_crypto_key regardless of the return value\nof blk_crypto_evict_key().\n\nThese two assumptions don't match, and the result is that there can be a\nuse-after-free in blk_crypto_reprogram_all_keys() after one of these\nerrors occurs. (Note, these errors *shouldn't* happen; we're just\ntalking about what happens if they do anyway.)\n\nFix this by making blk_crypto_evict_key() unlink the key from the\nkeyslot management structures even on failure.\n\nAlso improve some comments."
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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 vulnerable path is reached through ordinary filesystem syscalls (create/write/unlink causing inode eviction) on a locally-mounted fscrypt-encrypted volume backed by UFS/eMMC inline-crypto hardware; there is no remote protocol handler involved.\nAC:L - The attacker drives the eviction side of the race directly and can retry unboundedly — a tight create/write/unlink loop over per-file-key files generates thousands of `blk_crypto_evict_key()` calls per second against in-flight blk-mq requests, and UFS runtime-PM resume (which calls `blk_crypto_reprogram_all_keys()`) can be induced by alternating I/O bursts with idle periods.\nPR:L - Only an unprivileged local account with write access to an fscrypt-encrypted directory is needed — any sandboxed Android app in its own `/data/data` directory, or any user with an encrypted home — and no capability or namespace check exists anywhere on the path from `evict_inode()` to `__blk_crypto_evict_key()`.\nUI:N - The attacker performs every step itself — writing files, forcing inode eviction, and idling the device to provoke a controller reset — with no action required from any other user or administrator.\nS:U - The use-after-free occurs on a kernel heap object and is exploited within the kernel's own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed object is a `struct blk_crypto_key` holding raw key material, and `blk_crypto_reprogram_all_keys()` reads it after free and programs the (groomable) contents into a hardware keyslot; additionally the stale pointer-keyed hash entry causes a reallocated key to reuse a slot holding a different key, exposing file plaintext across encryption boundaries, and the UAF read primitive is generally leverageable for kernel memory disclosure.\nI:H - A use-after-free on a slab object whose lifetime the attacker controls permits heap spraying to place attacker-chosen data where the kernel expects a key, yielding a write/control primitive; independently, the wrong-key confusion silently encrypts user data at rest under the wrong key, corrupting it irrecoverably.\nA:H - Dereferencing the freed `blk_crypto_key` in `blk_crypto_reprogram_all_keys()` causes an oops or panic (plus the `WARN_ON_ONCE`/`WARN_ON` splats), and the attacker can repeat the trigger loop indefinitely to crash the system."
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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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"block/blk-crypto-profile.c",
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"block/blk-crypto.c"
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],
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"versions": [
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{
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"version": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "701a8220762ff90615dc91d3543f789391b63298",
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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": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "5bb4005fb667c6e2188fa87950f8d5faf2994410",
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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": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "64ef787bb1588475163069c2e62fdd8f6c27b1f6",
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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": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "809a5be62e92a444a3c3d7b9f438019d0b322f55",
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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": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "5c62852942667c613de0458fc797c5b8c36112b5",
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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": "1b2628397058ebce7277480960b29c788138de90",
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"lessThan": "5c7cb94452901a93e90c2230632e2c12a681bc92",
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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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"block/blk-crypto-profile.c",
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"block/blk-crypto.c"
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],
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"versions": [
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{
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"version": "5.8",
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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": "5.8",
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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": "5.10.180",
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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": "5.15.111",
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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": "6.1.28",
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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": "6.2.15",
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"lessThanOrEqual": "6.2.*",
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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": "6.3.2",
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"lessThanOrEqual": "6.3.*",
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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": "6.4",
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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": "5.8",
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"versionEndExcluding": "5.10.180"
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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": "5.8",
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"versionEndExcluding": "5.15.111"
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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": "5.8",
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"versionEndExcluding": "6.1.28"
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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": "5.8",
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"versionEndExcluding": "6.2.15"
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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": "5.8",
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"versionEndExcluding": "6.3.2"
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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": "5.8",
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"versionEndExcluding": "6.4"
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}
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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/701a8220762ff90615dc91d3543f789391b63298"
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},
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{
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"url": "https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410"
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},
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{
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"url": "https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6"
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},
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{
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"url": "https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92"
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}
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],
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"title": "blk-crypto: make blk_crypto_evict_key() more robust",
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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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} |