CVE-2026-64575 (GCVE-0-2026-64575)
Vulnerability from cvelistv5
Published
2026-08-05 08:09
Modified
2026-10-19 20:48
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: tcp: fix double sock release on batch realloc bpf_iter_tcp_batch() releases the current batch via bpf_iter_tcp_put_batch(), which drops the socket refs and rewrites each slot with the socket cookie, then grows the batch. cur_sk/end_sk are kept for bpf_iter_tcp_resume(), but on realloc failure the function returns ERR_PTR() before resume runs, leaving cur_sk < end_sk over slots that now hold cookies rather than sock pointers. bpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and dereferences a cookie as a struct sock. Empty the batch on the failure path so stop() does not release it again. The sockets were already freed by the first bpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans the bucket from the start instead of skipping it. The sibling GFP_NOWAIT failure path still holds real socket references and is left for stop() to release. BUG: KASAN: null-ptr-deref in __sock_gen_cookie Read of size 8 at addr 0000000000000059 by task exploit ... __sock_gen_cookie (net/core/sock_diag.c:28) bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918) bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270) bpf_seq_read (kernel/bpf/bpf_iter.c:205) vfs_read (fs/read_write.c:572) ksys_read (fs/read_write.c:716) do_syscall_64 entry_SYSCALL_64_after_hwframe Kernel panic - not syncing: Fatal exception
References
Impacted products
Vendor Product Version
Linux Linux Version: 9794ac757a650dd594391192183c9caf939f8223
Version: 1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4
Version: 36f955807ee4ede07e9410772f792e4cb4ec807b
Version: cdec67a489d4fdae3e83e04fca0419136a83c4c2
Version: cdec67a489d4fdae3e83e04fca0419136a83c4c2
Version: cdec67a489d4fdae3e83e04fca0419136a83c4c2
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-64575",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:43:09.032103Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T20:48:42.635Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729",
              "status": "affected",
              "version": "9794ac757a650dd594391192183c9caf939f8223",
              "versionType": "git"
            },
            {
              "lessThan": "7a6a6d2a127866935f87b55b557bc89693065462",
              "status": "affected",
              "version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4",
              "versionType": "git"
            },
            {
              "lessThan": "f0c1810320b0dac228103fad7311e89532134d83",
              "status": "affected",
              "version": "36f955807ee4ede07e9410772f792e4cb4ec807b",
              "versionType": "git"
            },
            {
              "lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d",
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "versionType": "git"
            },
            {
              "lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3",
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "versionType": "git"
            },
            {
              "lessThan": "980a813452754f8001704744e92f7aa697c53dd3",
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk \u003c end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n  BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n  Read of size 8 at addr 0000000000000059 by task exploit\n   ...\n   __sock_gen_cookie (net/core/sock_diag.c:28)\n   bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n   bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n   bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n   vfs_read (fs/read_write.c:572)\n   ksys_read (fs/read_write.c:716)\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n  Kernel panic - not syncing: Fatal exception"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Reached only through local bpf() syscalls that load a BPF_TRACE_ITER TCP program, create an iterator fd, and read it; bpf_seq_read drives bpf_iter_tcp_batch/stop. Per guidance BPF subsystem bugs are Local, not network-reachable.\nAC:L - The attacker controls both prerequisites: creating more than INIT_BATCH_SZ TCP sockets in one hash bucket to force bpf_iter_tcp_put_batch-then-realloc, and inducing GFP_USER -ENOMEM (memory pressure/cgroup limits) so the failure path runs without races outside their control.\nPR:L - Loading BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER requires CAP_BPF and CAP_PERFMON, which BPF tokens can delegate into a non-init user namespace; consistent with other BPF iterator CVEs this is Low rather than full init-namespace root.\nUI:N - The attacker loads their own TCP iterator program and triggers the bug by reading their iterator fd; no victim action such as mounting, opening a file, or interacting with the attacker is required.\nS:U - Impact is kernel memory corruption and panic within the same host kernel security authority; this is a standard local kernel bug, not a VM/hypervisor escape or IOMMU boundary bypass.\nC:H - stop() re-enters bpf_iter_tcp_put_batch and treats stored socket cookies as struct sock pointers, so sock_gen_cookie performs an out-of-bounds/wild kernel read; type-confused pointer dereference supports high confidentiality impact under the higher-severity rule.\nI:H - The same type confusion reaches sock_gen_put, which decrements sk_refcnt and may free through the forged pointer, yielding kernel memory corruption and a plausible control-flow/integrity primitive beyond a clean crash.\nA:H - The reported path is a KASAN null-ptr-deref in __sock_gen_cookie during bpf_iter_tcp_seq_stop that ends in kernel panic; the attacker can repeat the iterator read to deny host availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:28:54.764Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3"
        }
      ],
      "title": "bpf: tcp: fix double sock release on batch realloc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64575",
    "datePublished": "2026-08-05T08:09:31.923Z",
    "dateReserved": "2026-07-19T15:36:31.797Z",
    "dateUpdated": "2026-10-19T20:48:42.635Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:28:54.764Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: tcp: fix double sock release on batch realloc\\n\\nbpf_iter_tcp_batch() releases the current batch via\\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\\nreturns ERR_PTR() before resume runs, leaving cur_sk \u003c end_sk over\\nslots that now hold cookies rather than sock pointers.\\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\\ndereferences a cookie as a struct sock.\\n\\nEmpty the batch on the failure path so stop() does not release it\\nagain. The sockets were already freed by the first\\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\\nthe bucket from the start instead of skipping it. The sibling\\nGFP_NOWAIT failure path still holds real socket references and is left\\nfor stop() to release.\\n\\n  BUG: KASAN: null-ptr-deref in __sock_gen_cookie\\n  Read of size 8 at addr 0000000000000059 by task exploit\\n   ...\\n   __sock_gen_cookie (net/core/sock_diag.c:28)\\n   bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\\n   bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\\n   bpf_seq_read (kernel/bpf/bpf_iter.c:205)\\n   vfs_read (fs/read_write.c:572)\\n   ksys_read (fs/read_write.c:716)\\n   do_syscall_64\\n   entry_SYSCALL_64_after_hwframe\\n  Kernel panic - not syncing: Fatal exception\"}], \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - Reached only through local bpf() syscalls that load a BPF_TRACE_ITER TCP program, create an iterator fd, and read it; bpf_seq_read drives bpf_iter_tcp_batch/stop. Per guidance BPF subsystem bugs are Local, not network-reachable.\\nAC:L - The attacker controls both prerequisites: creating more than INIT_BATCH_SZ TCP sockets in one hash bucket to force bpf_iter_tcp_put_batch-then-realloc, and inducing GFP_USER -ENOMEM (memory pressure/cgroup limits) so the failure path runs without races outside their control.\\nPR:L - Loading BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER requires CAP_BPF and CAP_PERFMON, which BPF tokens can delegate into a non-init user namespace; consistent with other BPF iterator CVEs this is Low rather than full init-namespace root.\\nUI:N - The attacker loads their own TCP iterator program and triggers the bug by reading their iterator fd; no victim action such as mounting, opening a file, or interacting with the attacker is required.\\nS:U - Impact is kernel memory corruption and panic within the same host kernel security authority; this is a standard local kernel bug, not a VM/hypervisor escape or IOMMU boundary bypass.\\nC:H - stop() re-enters bpf_iter_tcp_put_batch and treats stored socket cookies as struct sock pointers, so sock_gen_cookie performs an out-of-bounds/wild kernel read; type-confused pointer dereference supports high confidentiality impact under the higher-severity rule.\\nI:H - The same type confusion reaches sock_gen_put, which decrements sk_refcnt and may free through the forged pointer, yielding kernel memory corruption and a plausible control-flow/integrity primitive beyond a clean crash.\\nA:H - The reported path is a KASAN null-ptr-deref in __sock_gen_cookie during bpf_iter_tcp_seq_stop that ends in kernel panic; the attacker can repeat the iterator read to deny host availability.\"}]}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"net/ipv4/tcp_ipv4.c\"], \"versions\": [{\"version\": \"9794ac757a650dd594391192183c9caf939f8223\", \"lessThan\": \"c842882e4c5d2818b858d6baf3fd10958c93f729\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4\", \"lessThan\": \"7a6a6d2a127866935f87b55b557bc89693065462\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"36f955807ee4ede07e9410772f792e4cb4ec807b\", \"lessThan\": \"f0c1810320b0dac228103fad7311e89532134d83\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"cdec67a489d4fdae3e83e04fca0419136a83c4c2\", \"lessThan\": \"9f27c4f0ae35b5390ce4f7a54d3501144e41a54d\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"cdec67a489d4fdae3e83e04fca0419136a83c4c2\", \"lessThan\": \"8a726e9585ffe7bfbfad2b5279277a00973970f3\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"cdec67a489d4fdae3e83e04fca0419136a83c4c2\", \"lessThan\": \"980a813452754f8001704744e92f7aa697c53dd3\", \"status\": \"affected\", \"versionType\": \"git\"}]}, {\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"affected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"net/ipv4/tcp_ipv4.c\"], \"versions\": [{\"version\": \"6.17\", \"status\": \"affected\"}, {\"version\": \"0\", \"lessThan\": \"6.17\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.18.42\", \"lessThanOrEqual\": \"6.18.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.1.6\", \"lessThanOrEqual\": \"7.1.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.2\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"6.18.42\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"7.1.6\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.17\", \"versionEndExcluding\": \"7.2\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729\"}, {\"url\": \"https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462\"}, {\"url\": \"https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83\"}, {\"url\": \"https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d\"}, {\"url\": \"https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3\"}, {\"url\": \"https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3\"}], \"title\": \"bpf: tcp: fix double sock release on batch realloc\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-64575\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:43:09.032103Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:43:09.675Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64575\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-07-19T15:36:31.797Z\", \"datePublished\": \"2026-08-05T08:09:31.923Z\", \"dateUpdated\": \"2026-10-19T20:48:42.635Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.