CVE-2021-47616 (GCVE-0-2021-47616)

Vulnerability from cvelistv5 – Published: 2024-06-19 14:58 – Updated: 2026-08-05 08:48
VLAI
Title
RDMA: Fix use-after-free in rxe_queue_cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA: Fix use-after-free in rxe_queue_cleanup On error handling path in rxe_qp_from_init() qp->sq.queue is freed and then rxe_create_qp() will drop last reference to this object. qp clean up function will try to free this queue one time and it causes UAF bug. Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init().
Severity
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: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 514aee660df493cd673154a6ba6bab745ec47b8c , < acb53e47db1fbc7cd37ab10b46388f045a76e383 (git)
Affected: 514aee660df493cd673154a6ba6bab745ec47b8c , < 84b01721e8042cdd1e8ffeb648844a09cd4213e0 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.10 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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Creating the device itself only needs CAP_NET_ADMIN, which is also obtainable in a user+net namespace.\\nUI:N - Exploitation requires only attacker-controlled syscalls; no victim action such as mounting a filesystem or opening a malicious file is needed.\\nS:U - This is standard kernel heap corruption leading to privilege escalation within the same host security authority, with no VM escape or IOMMU/cross-boundary impact.\\nC:H - The vulnerability is a use-after-free/double-free of the send queue object; per kernel UAF guidance this enables reclaim of the freed object and arbitrary kernel memory disclosure.\\nI:H - Double-free of the kmalloc\u0027d rxe_queue (and associated buffer) is classic heap corruption that can be turned into arbitrary write / control-flow hijacking via heap shaping.\\nA:H - The UAF reliably produces a kernel oops/crash (as seen in the syzbot KASAN report in rxe_queue_cleanup), so availability impact is High.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"514aee660df493cd673154a6ba6bab745ec47b8c\", \"lessThan\": \"acb53e47db1fbc7cd37ab10b46388f045a76e383\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"514aee660df493cd673154a6ba6bab745ec47b8c\", \"lessThan\": \"84b01721e8042cdd1e8ffeb648844a09cd4213e0\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/infiniband/sw/rxe/rxe_qp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/infiniband/sw/rxe/rxe_qp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/acb53e47db1fbc7cd37ab10b46388f045a76e383\"}, {\"url\": \"https://git.kernel.org/stable/c/84b01721e8042cdd1e8ffeb648844a09cd4213e0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA: Fix use-after-free in rxe_queue_cleanup\\n\\nOn error handling path in rxe_qp_from_init() qp-\u003esq.queue is freed and\\nthen rxe_create_qp() will drop last reference to this object. qp clean up\\nfunction will try to free this queue one time and it causes UAF bug.\\n\\nFix it by zeroing queue pointer after freeing queue in rxe_qp_from_init().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.10\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:48:39.530Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47616\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:48:39.530Z\", \"dateReserved\": \"2024-06-19T14:55:32.795Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T14:58:03.817Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.