Skip to content
Heist/ feed
High

net: smc: fix splice entry lifetime imbalance in smc_rx_splice

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.

Announced Source revision 1
Original source ↗

CVE-2026-74631

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-2026-74631

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": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "07ad246529d136d5ef441d5ab4c305d132ff3090",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "c841789e456ec6751342fa800639ce8e82ff0e6b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "af02c67ce654356c58db20a0bb2db33ace3b07a8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "ca8342b5fc24c249fdb998468f6a168b457c67e5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "4515c78f4d9fd577270f012efeb062ea58b3682d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
        "lessThan": "5d9686af2976741bbd79b150d1c9e60b81e7f12e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/smc/smc_rx.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/smc/smc_rx.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74631

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34251 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement