CVE-2024-53206 (GCVE-0-2024-53206)

Vulnerability from cvelistv5 – Published: 2024-12-27 13:49 – Updated: 2026-08-05 11:44
VLAI
Title
tcp: Fix use-after-free of nreq in reqsk_timer_handler().
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: Fix use-after-free of nreq in reqsk_timer_handler(). The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with __inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler(). Then, oreq should be passed to reqsk_put() instead of req; otherwise use-after-free of nreq could happen when reqsk is migrated but the retry attempt failed (e.g. due to timeout). Let's pass oreq to reqsk_put().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8459d61fbf24967839a70235165673148c7c7f17 , < 2dcc86fefe09ac853158afd96b60d544af115dc5 (git)
Affected: 5071beb59ee416e8ab456ac8647a4dabcda823b1 , < 9a3c1ad93e6fba67b3a637cfa95a57a6685e4908 (git)
Affected: 997ae8da14f1639ce6fb66a063dab54031cd61b3 , < 65ed89cad1f57034c256b016e89e8c0a4ec7c65b (git)
Affected: 51e34db64f4e43c7b055ccf881b7f3e0c31bb26d , < d0eb14cb8c08b00c36a3d5dc57a6f428b301f721 (git)
Affected: e8c526f2bdf1845bedaf6a478816a3d06fa78b8f , < 6d845028609a4af0ad66f499ee0bd5789122b067 (git)
Affected: e8c526f2bdf1845bedaf6a478816a3d06fa78b8f , < c31e72d021db2714df03df6c42855a1db592716c (git)
Affected: 106e457953315e476b3642ef24be25ed862aaba3 (git)
Affected: c964bf65f80a14288d767023a1b300b30f5b9cd0 (git)
Affected: 5.15.170 , < 5.15.174 (semver)
Affected: 6.1.115 , < 6.1.120 (semver)
Affected: 6.6.59 , < 6.6.64 (semver)
Affected: 6.11.6 , < 6.11.11 (semver)
Affected: 5.4.293 , < 5.5 (semver)
Affected: 5.10.237 , < 5.11 (semver)
Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:N - The vulnerable request sock and its timer are created purely by inbound TCP SYN packets to a listening port, and the failure branch is driven by the remote peer withholding or racing the final ACK. This is core TCP/IP receive-path code reachable by any remote client, including internet-facing servers.\nAC:L - The attacker controls both the object supply (SYN flood populates the SYN queue and the request_sock slab) and the branch selection (never ACK to force `expire`, or send the final ACK concurrently to lose the `own_req` race), giving repeatable success. Listener migration is a routine, recurring event on exactly the SO_REUSEPORT rolling-restart/worker-recycle deployments that enable `tcp_migrate_req`, so a persistent attacker hits it without special effort.\nPR:N - No authentication or credentials of any kind are needed \u2014 the attacker only sends SYNs to an open TCP port and declines to complete the handshake. The entire path executes in the pre-connection SYN-queue/timer context.\nUI:N - The whole sequence runs in softirq timer context off attacker-supplied packets, with no action required from any local user or administrator.\nS:U - The corruption is confined to kernel slab memory and kernel socket structures within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free lets the attacker reoccupy the freed `request_sock` slot with objects whose contents they control via crafted SYNs, and the resulting premature free of a live reqsk yields reads of `rsk_ops`, `rsk_listener`, and `saved_syn` from attacker-groomed memory, enabling kernel memory disclosure.\nI:H - `reqsk_put()` on freed memory performs a write (refcount decrement) into the slab, which can corrupt the SLUB free pointer or underflow a live request sock\u0027s refcount, cascading to an indirect call through `req-\u003ersk_ops-\u003edestructor` read from freed memory and a `sock_put()` listener refcount underflow \u2014 a control-flow-hijack-capable primitive.\nA:H - Even without full exploitation, the use-after-free and the resulting premature frees/refcount underflows on hashed request socks and listener sockets reliably produce slab corruption and kernel oops/panic, remotely and repeatably."
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    "datePublished": "2024-12-27T13:49:52.131Z",
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    "dateUpdated": "2026-08-05T11:44:35.910Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-53206\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:28.453\",\"lastModified\":\"2026-06-17T08:08:35.313\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: Fix use-after-free of nreq in reqsk_timer_handler().\\n\\nThe cited commit replaced inet_csk_reqsk_queue_drop_and_put() with\\n__inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler().\\n\\nThen, oreq should be passed to reqsk_put() instead of req; otherwise\\nuse-after-free of nreq could happen when reqsk is migrated but the\\nretry attempt failed (e.g. due to timeout).\\n\\nLet\u0027s pass oreq to reqsk_put().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: Se corrige el use-after-free de nreq en reqsk_timer_handler(). el commit citada reemplaz\u00f3 inet_csk_reqsk_queue_drop_and_put() con __inet_csk_reqsk_queue_drop() y reqsk_put() en reqsk_timer_handler(). Luego, oreq se debe pasar a reqsk_put() en lugar de req; de lo contrario, el use-after-free de nreq podr\u00eda ocurrir cuando se migra reqsk pero el intento de reintento falla (por ejemplo, debido al tiempo de espera). Pasemos oreq a 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-01-20T08:03:32+00:00",
      "cve": "CVE-2024-53206",
      "id": "CVE-2024-53206",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tcp: Fix use-after-free of nreq in reqsk_timer_handler().",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-53206.json",
      "version": "3"
    },
    "vulnrichment": {
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otherwise\\nuse-after-free of nreq could happen when reqsk is migrated but the\\nretry attempt failed (e.g. due to timeout).\\n\\nLet\u0027s pass oreq to reqsk_put().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.174\", \"versionStartIncluding\": \"5.15.170\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"6.1.115\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"6.6.59\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.11\", \"versionStartIncluding\": \"6.11.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.2\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.293\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.237\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:55:48.011Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-53206\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:55:48.011Z\", \"dateReserved\": \"2024-11-19T17:17:25.019Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T13:49:52.131Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.