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CVE-2024-26734 (GCVE-0-2024-26734)

Vulnerability from cvelistv5 – Published: 2024-04-03 17:00 – Updated: 2026-08-05 11:26
VLAI
Title
devlink: fix possible use-after-free and memory leaks in devlink_init()
Summary
In the Linux kernel, the following vulnerability has been resolved: devlink: fix possible use-after-free and memory leaks in devlink_init() The pernet operations structure for the subsystem must be registered before registering the generic netlink family. Make an unregister in case of unsuccessful registration.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:51 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 687125b5799cd5120437fa455cfccbe8537916ff , < 919092bd5482b7070ae66d1daef73b600738f3a2 (git)
Affected: 687125b5799cd5120437fa455cfccbe8537916ff , < e91d3561e28d7665f4f837880501dc8755f635a9 (git)
Affected: 687125b5799cd5120437fa455cfccbe8537916ff , < def689fc26b9a9622d2e2cb0c4933dd3b1c8071c (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.19 , ≤ 6.6.* (semver)
Unaffected: 6.7.7 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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Netlink-reachable kernel state is scored Local.\\nAC:H - The vulnerable state only exists if a registration inside the boot-time `subsys_initcall` `devlink_init()` fails, which depends on early-boot allocation conditions entirely outside attacker influence \\u2014 and in practice `register_pernet_subsys()` on `.pre_exit`-only ops and `register_netdevice_notifier()` on an always-`NOTIFY_OK` handler cannot fail at all.\\nPR:L - Once the pernet `pre_exit` hook is missing, the stale `devlink-\u003e_net` is dereferenced from `DEVLINK_CMD_*_GET`/dump handlers that carry no `GENL_ADMIN_PERM`, so any unprivileged local user with a netlink socket can touch the freed pointer.\\nUI:N - Triggering the devlink netlink query that dereferences the dangling namespace pointer requires no action by any other user or administrator.\\nS:U - The corruption and its consequences stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - A use-after-free on a freed `struct net` lets an attacker reclaim the slab with controlled data and read back kernel memory through devlink\u0027s namespace-filtered dump paths.\\nI:H - The same use-after-free permits heap spraying of the freed `struct net`, yielding attacker-influenced writes through the reference-counting and reload paths that operate on it, which is exploitable toward control-flow hijack.\\nA:H - Dereferencing a freed network namespace reliably produces an oops or panic, and the unbalanced registrations additionally leak kernel memory.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"687125b5799cd5120437fa455cfccbe8537916ff\", \"lessThan\": \"919092bd5482b7070ae66d1daef73b600738f3a2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"687125b5799cd5120437fa455cfccbe8537916ff\", \"lessThan\": \"e91d3561e28d7665f4f837880501dc8755f635a9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"687125b5799cd5120437fa455cfccbe8537916ff\", \"lessThan\": \"def689fc26b9a9622d2e2cb0c4933dd3b1c8071c\", \"versionType\": \"git\"}], \"programFiles\": [\"net/devlink/core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/devlink/core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/919092bd5482b7070ae66d1daef73b600738f3a2\"}, {\"url\": \"https://git.kernel.org/stable/c/e91d3561e28d7665f4f837880501dc8755f635a9\"}, {\"url\": \"https://git.kernel.org/stable/c/def689fc26b9a9622d2e2cb0c4933dd3b1c8071c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndevlink: fix possible use-after-free and memory leaks in devlink_init()\\n\\nThe pernet operations structure for the subsystem must be registered\\nbefore registering the generic netlink family.\\n\\nMake an unregister in case of unsuccessful registration.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.19\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.7\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:26:53.941Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26734\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:26:53.941Z\", \"dateReserved\": \"2024-02-19T14:20:24.165Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T17:00:21.162Z\", \"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.