CVE-2026-43245 (GCVE-0-2026-43245)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-08-05 12:26
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: ->d_compare() must not block ... so don't use __getname() there. Switch it (and ntfs_d_hash(), while we are at it) to kmalloc(PATH_MAX, GFP_NOWAIT). Yes, ntfs_d_hash() almost certainly can do with smaller allocations, but let ntfs folks deal with that - keep the allocation size as-is for now. Stop abusing names_cachep in ntfs, period - various uses of that thing in there have nothing to do with pathnames; just use k[mz]alloc() and be done with that. For now let's keep sizes as-in, but AFAICS none of the users actually want PATH_MAX.
References
Impacted products
Vendor Product Version
Linux Linux Version: a3a956c78efaa202b1d75190136671cf6e87bfbe
Version: a3a956c78efaa202b1d75190136671cf6e87bfbe
Version: a3a956c78efaa202b1d75190136671cf6e87bfbe
Version: a3a956c78efaa202b1d75190136671cf6e87bfbe
Version: a3a956c78efaa202b1d75190136671cf6e87bfbe
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/dir.c",
            "fs/ntfs3/fsntfs.c",
            "fs/ntfs3/inode.c",
            "fs/ntfs3/namei.c",
            "fs/ntfs3/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
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            },
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/dir.c",
            "fs/ntfs3/fsntfs.c",
            "fs/ntfs3/inode.c",
            "fs/ntfs3/namei.c",
            "fs/ntfs3/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: -\u003ed_compare() must not block\n\n... so don\u0027t 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\u0027s keep sizes as-in, but AFAICS none of\nthe users actually want PATH_MAX."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:50.510Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/02ecc0978c459fd90bb24b2a946dd16d43e68fe5"
        },
        {
          "url": "https://git.kernel.org/stable/c/1be7ca86ce1794d966fda5d82181bc978b150fbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/142c444a395f4d26055c8a4473e228bb86283f1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb4b1f969ba01fa1d4088467a02fc1e5f0806710"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca2a04e84af79596e5cd9cfe697d5122ec39c8ce"
        }
      ],
      "title": "ntfs: -\u003ed_compare() must not block",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43245",
    "datePublished": "2026-05-06T11:28:37.602Z",
    "dateReserved": "2026-05-01T14:12:55.996Z",
    "dateUpdated": "2026-08-05T12:26:50.510Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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