FKIE_CVE-2024-36971

Vulnerability from fkie_nvd - Published: 2024-06-10 09:15 - Updated: 2025-11-05 19:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/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
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix __dst_negative_advice() race __dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF. RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst). Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order. Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves. Note the check against NULL dst is centralized in __dst_negative_advice(), there is no need to duplicate it in various callbacks. Many thanks to Clement Lecigne for tracking this issue. This old bug became visible after the blamed commit, using UDP sockets.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cfPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cfPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971US Government Resource
Impacted products
Vendor Product Version
debian debian_linux 10.0
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
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  "cisaExploitAdd": "2024-08-07",
  "cisaRequiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "Android Kernel Remote Code Execution Vulnerability",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix __dst_negative_advice() race\n\n__dst_negative_advice() does not enforce proper RCU rules when\nsk-\u003edst_cache must be cleared, leading to possible UAF.\n\nRCU rules are that we must first clear sk-\u003esk_dst_cache,\nthen call dst_release(old_dst).\n\nNote that sk_dst_reset(sk) is implementing this protocol correctly,\nwhile __dst_negative_advice() uses the wrong order.\n\nGiven that ip6_negative_advice() has special logic\nagainst RTF_CACHE, this means each of the three -\u003enegative_advice()\nexisting methods must perform the sk_dst_reset() themselves.\n\nNote the check against NULL dst is centralized in\n__dst_negative_advice(), there is no need to duplicate\nit in various callbacks.\n\nMany thanks to Clement Lecigne for tracking this issue.\n\nThis old bug became visible after the blamed commit, using UDP sockets."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: fix __dst_negative_advice() race __dst_negative_advice() no aplica las reglas adecuadas de RCU cuando se debe borrar sk-\u0026gt;dst_cache, lo que genera una posible UAF. Las reglas de RCU son que primero debemos borrar sk-\u0026gt;sk_dst_cache y luego llamar a dst_release(old_dst). Tenga en cuenta que sk_dst_reset(sk) implementa este protocolo correctamente, mientras que __dst_negative_advice() utiliza el orden incorrecto. Dado que ip6_negative_advice() tiene una l\u00f3gica especial contra RTF_CACHE, esto significa que cada uno de los tres -\u0026gt;negative_advice() m\u00e9todos existentes debe realizar sk_dst_reset() ellos mismos. Tenga en cuenta que la verificaci\u00f3n de NULL dst est\u00e1 centralizada en __dst_negative_advice(), no es necesario duplicarla en varias devoluciones de llamada. Muchas gracias a Clement Lecigne por dar seguimiento a este problema. Este antiguo error se hizo visible despu\u00e9s de la confirmaci\u00f3n culpada, utilizando sockets UDP."
    }
  ],
  "id": "CVE-2024-36971",
  "lastModified": "2025-11-05T19:19:56.397",
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}


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Sightings

Author Source Type Date

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.