CVE-2024-36971 (GCVE-0-2024-36971)
Vulnerability from cvelistv5
Published
2024-06-10 09:03
Modified
2026-08-05 11:32
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: 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
Impacted products
Vendor Product Version
Linux Linux Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
Version: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2024-08-07

Due date: 2024-08-28

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Used in ransomware: Unknown

Notes: This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://source.android.com/docs/security/bulletin/2024-08-01, https://lore.kernel.org/linux-cve-announce/20240610090330.1347021-2-lee@kernel.org/T/#u ; https://nvd.nist.gov/vuln/detail/CVE-2024-36971

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              "value": "AV:L - The race must be driven by two concurrent local socket operations on the same fd \u2014 `setsockopt(SO_CNX_ADVICE)` and a lockless `udp_sendmsg()` \u2014 so the attacker needs local syscall access. A remote peer can drive only the free side (TCP retransmit timeouts, ICMP-induced PMTU/redirect exceptions), not the racing `sk_dst_cache` writer.\nAC:L - The attacker controls both sides of the race (one thread calling `SO_CNX_ADVICE`, another calling `sendmsg()` on the same connected socket) and can create the required route-exception/obsolete-dst precondition at will, retrying indefinitely across many sockets; in-the-wild exploitation confirms it is reliably winnable.\nPR:L - `SO_CNX_ADVICE` in `sock_setsockopt()` carries no capability check and a connected UDP socket needs no privileges, so any unprivileged local user \u2014 including a sandboxed Android app, as in the observed real-world exploit \u2014 can reach the code.\nUI:N - Exploitation is entirely self-driven through the attacker\u0027s own socket, timers and threads; no victim action is needed.\nS:U - The corrupted `dst_entry` and the resulting code execution are both within the kernel\u0027s own security authority \u2014 standard local privilege escalation, no VM/IOMMU boundary crossed.\nC:H - The refcount underflow yields a use-after-free on a `dst_entry` whose contents (ops table, metrics, neighbour and function pointers) can be replaced by attacker-sprayed data, giving a kernel read primitive and full disclosure once escalated to root.\nI:H - `dst_entry` holds `ops`, `input()` and `output()` function pointers invoked on every transmit, so reclaiming the freed object gives direct control-flow hijack and arbitrary kernel write \u2014 this was weaponized as an in-the-wild Android privilege escalation.\nA:H - Even unweaponized, the premature free and dangling `sk_dst_cache` dereference cause refcount WARNs, memory corruption and kernel oops/panic, and the trigger can be repeated freely by an unprivileged process."
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    "cveId": "CVE-2024-36971",
    "datePublished": "2024-06-10T09:03:23.878Z",
    "dateReserved": "2024-05-30T15:25:07.082Z",
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      "dueDate": "2024-08-28",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see:   https://source.android.com/docs/security/bulletin/2024-08-01,  https://lore.kernel.org/linux-cve-announce/20240610090330.1347021-2-lee@kernel.org/T/#u ; https://nvd.nist.gov/vuln/detail/CVE-2024-36971",
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      "requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
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      "vendorProject": "Android",
      "vulnerabilityName": "Android Kernel Remote Code Execution Vulnerability"
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\"lessThan\": \"b8af8e6118a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"92f1655aa2b2\", \"versionType\": \"git\"}], \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"051c0bde9f04\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"db0082825037\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"2295a7ef5c8c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"eacb8b195579\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"81dd3c82a456\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"5af198c38712\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"b8af8e6118a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"92f1655aa2b2\", \"versionType\": \"git\"}], \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"051c0bde9f04\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"db0082825037\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"2295a7ef5c8c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"eacb8b195579\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"81dd3c82a456\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"5af198c38712\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"b8af8e6118a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee8\", \"lessThan\": \"92f1655aa2b2\", \"versionType\": \"git\"}], \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:4.19.316:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"4.19.316\", \"lessThan\": \"4.20\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.4.278:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.4.278\", \"lessThan\": \"5.5\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.10.219:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.10.219\", \"lessThan\": \"5.11\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.15.161:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.15.161\", \"lessThan\": \"5.16\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:6.1.94:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.1.94\", \"lessThan\": \"6.2\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:6.6.34:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.6.34\", \"lessThan\": \"6.7\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:6.9.4:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.9.4\", \"lessThan\": \"6.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:6.10:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"*\"}], \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2024-08-07T00:00:00.000Z\", \"value\": \"CVE-2024-36971 added to CISA KEV\"}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971\", \"tags\": [\"government-resource\"]}], \"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\": \"2024-08-06T17:00:13.363Z\"}}], \"cna\": {\"title\": \"net: fix __dst_negative_advice() race\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"051c0bde9f0450a2ec3d62a86d2a0d2fad117f13\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"db0082825037794c5dba9959c9de13ca34cc5e72\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"2295a7ef5c8c49241bff769e7826ef2582e532a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"eacb8b195579c174a6d3e12a9690b206eb7f28cf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"81dd3c82a456b0015461754be7cb2693991421b4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"5af198c387128a9d2ddd620b0f0803564a4d4508\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"b8af8e6118a6605f0e495a58d591ca94a85a50fc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314\", \"lessThan\": \"92f1655aa2b2294d0b49925f3b875a634bd3b59e\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/dst_ops.h\", \"include/net/sock.h\", \"net/ipv4/route.c\", \"net/ipv6/route.c\", \"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.316\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.278\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.219\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.161\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/dst_ops.h\", \"include/net/sock.h\", \"net/ipv4/route.c\", \"net/ipv6/route.c\", \"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13\"}, {\"url\": \"https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72\"}, {\"url\": \"https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6\"}, {\"url\": \"https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf\"}, {\"url\": \"https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4\"}, {\"url\": \"https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508\"}, {\"url\": \"https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc\"}, {\"url\": \"https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.316\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.278\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.219\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.94\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.34\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"4.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:13:06.632Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36971\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T17:21:17.010Z\", \"dateReserved\": \"2024-05-30T15:25:07.082Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-10T09:03:23.878Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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