CVE-2026-90065 (GCVE-0-2026-90065)
Vulnerability from cvelistv5
Published
2026-09-17 16:05
Modified
2026-10-19 08:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure IPPROTO_SMC sockets create an internal TCP sock ("clcsock") from the proto->init hook. When socket creation fails after proto->init has run - e.g. a cgroup BPF program attached to BPF_CGROUP_INET_SOCK_CREATE denies the socket - sk_common_release() only invokes sk_prot->destroy if it is set, but neither smc_inet_prot nor smc_inet6_prot defines it, and smc_destruct() returns early unless sk_state is SMC_CLOSED. As a result, every failing socket(AF_INET, SOCK_STREAM, IPPROTO_SMC) call leaks one tcp_sock, so an unprivileged task able to attach a deny-all BPF_CGROUP_INET_SOCK_CREATE program to its own cgroup can grow kernel memory unboundedly. Add a .destroy hook to both protos that releases the clcsock via smc_clcsock_release(). smc_sk_init() hashes the sock into the smc hashinfo before the clcsock is created, and smc_diag dumps walk that hash dereferencing smc->clcsock without taking clcsock_release_lock, while sk_common_release() calls .destroy before .unhash. Unhash the sock before releasing the clcsock, as __smc_release() does, so a concurrent dump cannot observe the release; the second unhash in sk_common_release() is a no-op.
References
Impacted products
Vendor Product Version
Linux Linux Version: d25a92ccae6bed02327b63d138e12e7806830f78
Version: d25a92ccae6bed02327b63d138e12e7806830f78
Version: d25a92ccae6bed02327b63d138e12e7806830f78
Version: d25a92ccae6bed02327b63d138e12e7806830f78
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_inet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2f4ece7fed6d915ec64b7735962c0d84d6261032",
              "status": "affected",
              "version": "d25a92ccae6bed02327b63d138e12e7806830f78",
              "versionType": "git"
            },
            {
              "lessThan": "84180988a455fd8e147c6b35c8df65d8b8cc76c2",
              "status": "affected",
              "version": "d25a92ccae6bed02327b63d138e12e7806830f78",
              "versionType": "git"
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            {
              "lessThan": "94a913cd521c0f0408820bcdbd80dadf076d97b5",
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              "version": "d25a92ccae6bed02327b63d138e12e7806830f78",
              "versionType": "git"
            },
            {
              "lessThan": "cec261b0b4c5c0b044165303198d10ffcdf3414c",
              "status": "affected",
              "version": "d25a92ccae6bed02327b63d138e12e7806830f78",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_inet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure\n\nIPPROTO_SMC sockets create an internal TCP sock (\"clcsock\") from the\nproto-\u003einit hook. When socket creation fails after proto-\u003einit has\nrun - e.g. a cgroup BPF program attached to BPF_CGROUP_INET_SOCK_CREATE\ndenies the socket - sk_common_release() only invokes sk_prot-\u003edestroy\nif it is set, but neither smc_inet_prot nor smc_inet6_prot defines it,\nand smc_destruct() returns early unless sk_state is SMC_CLOSED. As a\nresult, every failing socket(AF_INET, SOCK_STREAM, IPPROTO_SMC) call\nleaks one tcp_sock, so an unprivileged task able to attach a deny-all\nBPF_CGROUP_INET_SOCK_CREATE program to its own cgroup can grow kernel\nmemory unboundedly.\n\nAdd a .destroy hook to both protos that releases the clcsock via\nsmc_clcsock_release(). smc_sk_init() hashes the sock into the smc\nhashinfo before the clcsock is created, and smc_diag dumps walk that\nhash dereferencing smc-\u003eclcsock without taking clcsock_release_lock,\nwhile sk_common_release() calls .destroy before .unhash. Unhash the\nsock before releasing the clcsock, as __smc_release() does, so a\nconcurrent dump cannot observe the release; the second unhash in\nsk_common_release() is a no-op."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:57:22.598Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2f4ece7fed6d915ec64b7735962c0d84d6261032"
        },
        {
          "url": "https://git.kernel.org/stable/c/84180988a455fd8e147c6b35c8df65d8b8cc76c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/94a913cd521c0f0408820bcdbd80dadf076d97b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/cec261b0b4c5c0b044165303198d10ffcdf3414c"
        }
      ],
      "title": "net/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90065",
    "datePublished": "2026-09-17T16:05:48.269Z",
    "dateReserved": "2026-09-11T19:38:34.784Z",
    "dateUpdated": "2026-10-19T08:57:22.598Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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