{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43245",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43245"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "ntfs: ->d_compare() must not block",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: ->d_compare() must not block\n\n... so don't use __getname() there.  Switch it (and ntfs_d_hash(), while\nwe are at it) to kmalloc(PATH_MAX, GFP_NOWAIT).  Yes, ntfs_d_hash()\nalmost certainly can do with smaller allocations, but let ntfs folks\ndeal with that - keep the allocation size as-is for now.\n\nStop abusing names_cachep in ntfs, period - various uses of that thing\nin there have nothing to do with pathnames; just use k[mz]alloc() and\nbe done with that.  For now let's keep sizes as-in, but AFAICS none of\nthe users actually want PATH_MAX.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43245"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/02ecc0978c459fd90bb24b2a946dd16d43e68fe5"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable `ntfs_d_compare()` is reached during ordinary VFS pathname lookup on an ntfs3 `nocase` mount; a reasonable high-impact deployment is an ntfs3 volume exported by in-kernel NFS/SMB, where remote client-supplied pathnames drive that lookup. Local syscalls can also trigger it, but the network-file-server path is the higher defensible attack vector.\nAC:L - The attacker controls the lookup pathname and can repeatedly exercise non-ASCII/case-insensitive comparisons that enter the slow path. The bug is a deterministic forbidden blocking allocation in a non-blocking VFS callback, not a race requiring conditions outside attacker influence.\nPR:N - In the network-export scenario, a remote client can issue lookup/open/stat style requests against an exported share without having local privileges on the kernel host. If authentication is configured it may raise environmental requirements, but an unauthenticated or guest-accessible export is reasonable.\nUI:N - No victim user action is required once the vulnerable ntfs3 filesystem is mounted/exported. The attacker triggers the path lookup directly by requesting crafted pathnames.\nS:U - The impact remains within the kernel/filesystem security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:N - The bug is sleeping/blocking allocation in `d_compare()`, not a memory disclosure primitive. I found no out-of-bounds read, use-after-free, or arbitrary read behavior in the fixed path.\nI:N - The vulnerable code does not corrupt attacker-controlled memory or provide a write primitive. It violates VFS atomic/RCU locking rules but does not directly modify data or enable control-flow hijacking.\nA:H - Calling `__getname()`/`GFP_KERNEL` from `d_compare()` can sleep in RCU/non-blocking lookup context, causing RCU stalls, soft lockups, warnings/oopses, or deadlock under pressure. Repeated attacker-triggered lookups can therefore deny service to the kernel."
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}