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SUNRPC: Check svc pool percpu counter allocation

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Check svc pool percpu counter allocation __svc_create() initializes three per-pool percpu_counter stats and ignores every return value. On SMP, percpu_counter_init() fails when __alloc_percpu_gfp() cannot satisfy the allocation, leaving the failed counter with fbc->counters == NULL and its embedded raw_spinlock_t, list_head, and count never initialized. __svc_create() returns the half-constructed svc_serv to nfsd, lockd, or the NFS callback service anyway. Once that service is live, the hot-path increments in svc_xprt_enqueue(), svc_handle_xprt(), and svc_pool_wake_idle_thread() reach a counter whose backing pointer is NULL. The pointer is a per-cpu offset, so the access does not fault: it resolves to offset zero of the current CPU's per-cpu area and silently corrupts whatever variable lives there. A /proc/fs/nfsd/pool_stats read walks the same NULL per-cpu storage and returns garbage, and on CONFIG_DEBUG_SPINLOCK or lockdep it splats on the never-initialized lock. Creating the broken service requires a percpu allocation failure during RPC server startup, so it is reachable only by a local administrator under memory pressure or fault injection; a remote peer cannot induce the bad state on its own. Check each percpu_counter_init() return value in __svc_create() and fail when an allocation fails, unwinding the counters already set up in the current pool and in every pool initialized before it. A discret

Announced Source revision 1
Original source ↗

CVE-2026-89547

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-2026-89547

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": "ccf08bed6e7a80519569456edd2ea21b7b1701c6",
        "lessThan": "57ac7d899409b0a9b768cf417e3bb86bcca3d4c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf08bed6e7a80519569456edd2ea21b7b1701c6",
        "lessThan": "3a2b7649de76376a69f1d3ed2a539fb15907cd4d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf08bed6e7a80519569456edd2ea21b7b1701c6",
        "lessThan": "bd1ef2cfb44d72b7aa6943e87b206eb0e30fbd0c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf08bed6e7a80519569456edd2ea21b7b1701c6",
        "lessThan": "b541a15046976e481618726cc23db0fb22d576db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ccf08bed6e7a80519569456edd2ea21b7b1701c6",
        "lessThan": "43e11e164704dde975c9edb370de1a06bec67270",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sunrpc/svc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sunrpc/svc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89547

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35063 · Revision 1
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Publisher date
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