248 lines
12 KiB
JSON
248 lines
12 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-2023-52837",
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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": "2024-05-21T15:19:24.253Z",
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"datePublished": "2024-05-21T15:31:37.859Z",
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"dateUpdated": "2026-08-05T09:11:37.586Z"
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},
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"containers": {
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"cna": {
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"dateUpdated": "2026-08-05T09:11:37.586Z"
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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\nnbd: fix uaf in nbd_open\n\nCommit 4af5f2e03013 (\"nbd: use blk_mq_alloc_disk and\nblk_cleanup_disk\") cleans up disk by blk_cleanup_disk() and it won't set\ndisk->private_data as NULL as before. UAF may be triggered in nbd_open()\nif someone tries to open nbd device right after nbd_put() since nbd has\nbeen free in nbd_dev_remove().\n\nFix this by implementing ->free_disk and free private data in it."
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"metrics": [
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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 bug is reached by opening the local NBD block device node (/dev/nbdX) via the normal block open path into nbd_open; the kernel NBD code is a client and this UAF is not triggered by remote packet processing.\nAC:L - The attacker can drive both sides of the teardown-vs-open race (e.g., close triggering destroy with DESTROY_ON_DISCONNECT/DISCONNECT_ON_CLOSE while concurrently opening), so success does not depend on conditions outside attacker control.\nPR:L - nbd_open has no capability check and is reachable to a local user who can open the NBD device node; while creating/configuring NBD needs CAP_SYS_ADMIN in the init namespace, exploitation of an existing destroy-on-disconnect device does not require full admin rights.\nUI:N - The attacker triggers the vulnerability directly by opening/closing the NBD device; no separate victim action is required.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same OS security authority, with no VM escape or other cross-boundary impact.\nC:H - Use-after-free of the nbd_device object allows reclaim and reuse of the freed object, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF can be turned into heap spray and control-flow hijacking primitives, enabling arbitrary kernel writes or code execution.\nA:H - Dereferencing the freed nbd_device in nbd_open can cause kernel oops/panic even without full exploitation, so availability impact is high."
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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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"drivers/block/nbd.c"
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"version": "0",
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"lessThanOrEqual": "6.1.*",
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"lessThanOrEqual": "6.5.*",
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"status": "unaffected",
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},
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"version": "6.6.2",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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"version": "6.7",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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