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NFSv4: remove callback IDR entry on client allocation failure

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.

Announced Group revision 1
Original source ↗

CVE-2026-90151

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90151

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "68c721391b761dbe38d5b0094d2bb6e8489ad92b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "9bfdd0f591307b5198826a0e7a5b2f35f87acd2d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "7c4812eb96bdcafb31a65b12f2aa96659429d1d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "fc95ca82d5ae598c428ab5a00ae69f8526d59371",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "80b1c3d5a881f7d9081aa9f46da9742878a0f893",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "3f2387e8bfbc4efda5d77c3a11a028d0a119c48f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "5891c03e150920618db0e9c4ea2d772abacdcfd1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f4eecd5da3422e82e88e36c33cbd2595eebcacb1",
        "lessThan": "d05c2007b3d84ccba11dc6e9cb3202768cc72f14",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/nfs/client.c",
      "fs/nfs/internal.h",
      "fs/nfs/nfs4client.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.38"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.38",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/nfs/client.c",
      "fs/nfs/internal.h",
      "fs/nfs/nfs4client.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90151

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#36544 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-90151 · Revision 1Source updated