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net/smc: free pending qentry in smc_llc_flow_stop() before memset

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/smc: free pending qentry in smc_llc_flow_stop() before memset smc_llc_flow_stop() resets a flow struct with a blind memset: spin_lock_bh(&lgr->llc_flow_lock); memset(flow, 0, sizeof(*flow)); flow->type = SMC_LLC_FLOW_NONE; spin_unlock_bh(&lgr->llc_flow_lock); If flow->qentry is non-NULL at this point the pointer is overwritten without the allocation being freed, leaking one kmalloc object. A late-arriving duplicate CONFIRM_LINK or ADD_LINK_CONT message can set flow->qentry after the legitimate message has been consumed by the waiter via smc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow->type non-zero) but before the flow completes and smc_llc_flow_stop() runs. In that window the duplicate is stashed into flow->qentry, and then lost when smc_llc_flow_stop() zeros the struct. Call smc_llc_flow_qentry_del() inside the lock before the memset. smc_llc_flow_qentry_del() already checks flow->qentry before freeing, so the normal case where no entry is pending is a no-op.

Announced Source revision 1
Original source ↗

CVE-2026-90107

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-2026-90107

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": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "8e3deb150a5237b672c4579e69a6deb02027dbed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "11bc373ee6630709f0c2da2e7860c23d503c9e9d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "032aec7d03c9102616b98fea74f8f7145e7f867c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "957dba2b8b5aebfe09caa6a6b22b958079082eab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "f03aa5d36ae3c4068a1c3885146be99aa7fd9307",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "0879ea157acc1ac6752f6fcb755d1f91a2359238",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "555da9af827d95134656fa459c8f3ece04dd867a",
        "lessThan": "5ee0ceddc7785c6dcf4a8107fef01f0414a354f4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/smc/smc_llc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "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": [
      "net/smc/smc_llc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90107

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36513 · Revision 1
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