CVE-2026-64575 (GCVE-0-2026-64575)

Vulnerability from cvelistv5 – Published: 2026-08-05 08:09 – Updated: 2026-08-05 08:09
VLAI
Title
bpf: tcp: fix double sock release on batch realloc
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cdec67a489d4fdae3e83e04fca0419136a83c4c2 , < 9f27c4f0ae35b5390ce4f7a54d3501144e41a54d (git)
Affected: cdec67a489d4fdae3e83e04fca0419136a83c4c2 , < 8a726e9585ffe7bfbfad2b5279277a00973970f3 (git)
Affected: cdec67a489d4fdae3e83e04fca0419136a83c4c2 , < 980a813452754f8001704744e92f7aa697c53dd3 (git)
Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "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": "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-rc5",
              "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-rc5",
                  "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:09:31.923Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": "2026-08-05T08:09:31.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64575",
      "date": "2026-08-06",
      "epss": "0.00154",
      "percentile": "0.05103"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64575\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-05T08:16:37.363\",\"lastModified\":\"2026-08-05T08:16:37.363\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/tcp_ipv4.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cdec67a489d4fdae3e83e04fca0419136a83c4c2\",\"lessThan\":\"9f27c4f0ae35b5390ce4f7a54d3501144e41a54d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cdec67a489d4fdae3e83e04fca0419136a83c4c2\",\"lessThan\":\"8a726e9585ffe7bfbfad2b5279277a00973970f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cdec67a489d4fdae3e83e04fca0419136a83c4c2\",\"lessThan\":\"980a813452754f8001704744e92f7aa697c53dd3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/tcp_ipv4.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T12:11:44+00:00",
      "cve": "CVE-2026-64575",
      "id": "CVE-2026-64575",
      "initial_release_date": "2026-08-05T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: tcp: fix double sock release on batch realloc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64575.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-06T01:06:21Z",
      "cve": "CVE-2026-64575",
      "id": "CVE-2026-64575",
      "initial_release_date": "2026-08-06T01:06:21Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64575",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64575.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.