310 lines
15 KiB
JSON
310 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2023-52669",
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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": "2024-03-07T14:49:46.885Z",
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"datePublished": "2024-05-17T14:01:57.025Z",
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"dateUpdated": "2026-08-05T09:10:57.565Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:10:57.565Z"
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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\ncrypto: s390/aes - Fix buffer overread in CTR mode\n\nWhen processing the last block, the s390 ctr code will always read\na whole block, even if there isn't a whole block of data left. Fix\nthis by using the actual length left and copy it into a buffer first\nfor processing."
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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:L/I:N/A:H",
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"baseScore": 8.2,
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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:N - rfc3686(ctr(aes)) is an XFRM/ESP transform that resolves to ctr-aes-s390; on an IPsec gateway, attacker-controlled forwarded packet lengths hit authenc encrypt which calls crypto_skcipher_encrypt before ICV generation, so the vulnerable CTR path processes remote traffic.\nAC:L - The attacker reliably triggers the partial final-block path by choosing a cryptlen that is not a multiple of AES_BLOCK_SIZE, and can place that remainder near a page boundary via packet or AF_ALG buffer sizing with no uncontrollable race.\nPR:N - Outbound ESP encryption on a configured IPsec/XFRM path runs on forwarded packets without a local account or capability; SA/policy setup is deployment configuration, not attacker privilege.\nUI:N - No victim interaction is required; crafted packet lengths or local AF_ALG send/recv sequences alone exercise the vulnerable final-block read.\nS:U - Impact stays inside the same kernel authority (crypto/XFRM on the host) and does not demonstrate VM escape, IOMMU bypass, or another cross-scope boundary.\nC:L - The bug over-reads up to 15 bytes of adjacent source memory into the KMCTR path; that is a strictly bounded OOB read (not arbitrary), and the truncated memcpy to dst does not return those bytes, so confidentiality is limited rather than high.\nI:N - This is a source overread only—destination writes are already limited to nbytes—and CTR output for the valid bytes is not an integrity-corrupting write primitive.\nA:H - Reading a full AES block when nbytes is smaller can touch the next page beyond the scatterwalk mapping (or a guard/KFENCE page), causing a kernel fault/oops and denial of service."
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}
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]
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}
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],
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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/s390/crypto/aes_s390.c",
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"arch/s390/crypto/paes_s390.c"
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"version": "0",
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"version": "6.6.15",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"version": "6.7.3",
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"status": "unaffected",
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"version": "6.8",
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