CVE-2026-90107 (GCVE-0-2026-90107)
Vulnerability from cvelistv5
Published
2026-09-17 16:06
Modified
2026-10-19 08:58
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
Version: 555da9af827d95134656fa459c8f3ece04dd867a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_llc.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "version": "5.15.221",
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
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            },
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              "lessThanOrEqual": "6.6.*",
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            },
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              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.110",
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              "version": "7.2.6",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free pending qentry in smc_llc_flow_stop() before memset\n\nsmc_llc_flow_stop() resets a flow struct with a blind memset:\n\n\tspin_lock_bh(\u0026lgr-\u003ellc_flow_lock);\n\tmemset(flow, 0, sizeof(*flow));\n\tflow-\u003etype = SMC_LLC_FLOW_NONE;\n\tspin_unlock_bh(\u0026lgr-\u003ellc_flow_lock);\n\nIf flow-\u003eqentry is non-NULL at this point the pointer is overwritten without the\nallocation being freed, leaking one kmalloc object.\n\nA late-arriving duplicate CONFIRM_LINK or ADD_LINK_CONT message can set\nflow-\u003eqentry after the legitimate message has been consumed by the waiter via\nsmc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow-\u003etype\nnon-zero) but before the flow completes and smc_llc_flow_stop() runs.  In that\nwindow the duplicate is stashed into flow-\u003eqentry, and then lost when\nsmc_llc_flow_stop() zeros the struct.\n\nCall smc_llc_flow_qentry_del() inside the lock before the memset.\nsmc_llc_flow_qentry_del() already checks flow-\u003eqentry before freeing, so the\nnormal case where no entry is pending is a no-op."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:05.815Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8e3deb150a5237b672c4579e69a6deb02027dbed"
        },
        {
          "url": "https://git.kernel.org/stable/c/11bc373ee6630709f0c2da2e7860c23d503c9e9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/032aec7d03c9102616b98fea74f8f7145e7f867c"
        },
        {
          "url": "https://git.kernel.org/stable/c/957dba2b8b5aebfe09caa6a6b22b958079082eab"
        },
        {
          "url": "https://git.kernel.org/stable/c/f03aa5d36ae3c4068a1c3885146be99aa7fd9307"
        },
        {
          "url": "https://git.kernel.org/stable/c/0879ea157acc1ac6752f6fcb755d1f91a2359238"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ee0ceddc7785c6dcf4a8107fef01f0414a354f4"
        }
      ],
      "title": "net/smc: free pending qentry in smc_llc_flow_stop() before memset",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90107",
    "datePublished": "2026-09-17T16:06:16.157Z",
    "dateReserved": "2026-09-11T19:38:34.787Z",
    "dateUpdated": "2026-10-19T08:58:05.815Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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