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CVE-2025-21683 (GCVE-0-2025-21683)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-05-12 12:03
VLAI
Title
bpf: Fix bpf_sk_select_reuseport() memory leak
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sk_select_reuseport() memory leak As pointed out in the original comment, lookup in sockmap can return a TCP ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb does not imply a non-refcounted socket. Drop sk's reference in both error paths. unreferenced object 0xffff888101911800 (size 2048): comm "test_progs", pid 44109, jiffies 4297131437 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:51 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < bb36838dac7bb334a3f3d7eb29875593ec9473fc (git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf (git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < d0a3b3d1176d39218b8edb2a2d03164942ab9ccd (git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < b02e70be498b138e9c21701c2f33f4018ca7cd5e (git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < cccd51dd22574216e64e5d205489e634f86999f3 (git)
Affected: 64d85290d79c0677edb5a8ee2295b36c022fa5df , < b3af60928ab9129befa65e6df0310d27300942bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.127 , ≤ 6.1.* (semver)
Unaffected: 6.6.74 , ≤ 6.6.* (semver)
Unaffected: 6.12.11 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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In other words, a non-NULL sk_reuseport_cb\\ndoes not imply a non-refcounted socket.\\n\\nDrop sk\u0027s reference in both error paths.\\n\\nunreferenced object 0xffff888101911800 (size 2048):\\n  comm \\\"test_progs\\\", pid 44109, jiffies 4297131437\\n  hex dump (first 32 bytes):\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n    80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace (crc 9336483b):\\n    __kmalloc_noprof+0x3bf/0x560\\n    __reuseport_alloc+0x1d/0x40\\n    reuseport_alloc+0xca/0x150\\n    reuseport_attach_prog+0x87/0x140\\n    sk_reuseport_attach_bpf+0xc8/0x100\\n    sk_setsockopt+0x1181/0x1990\\n    do_sock_setsockopt+0x12b/0x160\\n    __sys_setsockopt+0x7b/0xc0\\n    __x64_sys_setsockopt+0x1b/0x30\\n    do_syscall_64+0x93/0x180\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se solucion\u00f3 la p\u00e9rdida de memoria de bpf_sk_select_reuseport() Como se se\u00f1al\u00f3 en el comentario original, la b\u00fasqueda en sockmap puede devolver un socket TCP ESTABLISHED. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T23:33:36+00:00",
      "cve": "CVE-2025-21683",
      "id": "CVE-2025-21683",
      "initial_release_date": "2025-01-31T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix bpf_sk_select_reuseport() memory leak",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21683.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-01T13:52:58Z",
      "cve": "CVE-2025-21683",
      "id": "CVE-2025-21683",
      "initial_release_date": "2025-02-01T03:47:21Z",
      "product_status:known_affected": "583",
      "product_status:known_not_affected": "223",
      "product_status:recommended": "407",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21683",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21683.json",
      "version": "86"
    },
    "vulnrichment": {
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Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF\\nset before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb\\ndoes not imply a non-refcounted socket.\\n\\nDrop sk\u0027s reference in both error paths.\\n\\nunreferenced object 0xffff888101911800 (size 2048):\\n  comm \\\"test_progs\\\", pid 44109, jiffies 4297131437\\n  hex dump (first 32 bytes):\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n    80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace (crc 9336483b):\\n    __kmalloc_noprof+0x3bf/0x560\\n    __reuseport_alloc+0x1d/0x40\\n    reuseport_alloc+0xca/0x150\\n    reuseport_attach_prog+0x87/0x140\\n    sk_reuseport_attach_bpf+0xc8/0x100\\n    sk_setsockopt+0x1181/0x1990\\n    do_sock_setsockopt+0x12b/0x160\\n    __sys_setsockopt+0x7b/0xc0\\n    __x64_sys_setsockopt+0x1b/0x30\\n    do_syscall_64+0x93/0x180\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.177\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.127\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.74\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.11\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:04:25.699Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21683\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T21:04:25.699Z\", \"dateReserved\": \"2024-12-29T08:45:45.739Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-01-31T11:25:42.903Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.