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CVE-2026-72434 (GCVE-0-2026-72434)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:44
VLAI
Title
netfilter: ipset: make sure gc is properly stopped
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: make sure gc is properly stopped Sashiko noticed that when destroying a set, cancel_delayed_work_sync() was called while gc calls queue_delayed_work() unconditionally which can lead not to properly shutting down the gc.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f66ee0410b1c3481ee75e5db9b34547b4d582465 , < c940d1b96248c3081b664ede5418078bdc7c8c07 (git)
Affected: f66ee0410b1c3481ee75e5db9b34547b4d582465 , < 12088da6add5b003657c8506c5b0fcef835083b8 (git)
Affected: f66ee0410b1c3481ee75e5db9b34547b4d582465 , < c78bd5195a5998094a5866df702fbeafda60dafb (git)
Affected: f66ee0410b1c3481ee75e5db9b34547b4d582465 , < 4a597a87e2e2f608edb6be2c510dc826b4fdfb53 (git)
Affected: 5dd9488ae41070b69d2f4acb580f77db5705f9ca (git)
Affected: a469bab3386aebff33c59506f3a95e35b91118fd (git)
Affected: 5.4.24 , < 5.5 (semver)
Affected: 5.5.8 , < 5.6 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipset/ip_set_hash_gen.h"
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        }
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            "version": "3.1"
          },
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              "value": "AV:L - The bug is reached only via NFNETLINK ipset destroy/cleanup (IPSET_CMD_DESTROY or netns exit calling cancel_gc), not by processing remote packets; all entry points are local netlink syscalls into net/netfilter/ipset.\nAC:L - An attacker with CAP_NET_ADMIN creates a timeout hash ipset, waits for the workqueue GC to run, then destroys the set; because mtype_gc always re-queues itself at the end of execution, cancel_delayed_work_sync reliably leaves a pending GC after teardown.\nPR:L - All ipset management, including set destroy that calls mtype_cancel_gc, requires CAP_NET_ADMIN checked by netlink_net_capable in nfnetlink; unprivileged users can obtain this in an isolated user+network namespace via unshare -Urn.\nUI:N - Exploitation is fully automated through netlink ipset create/destroy commands and does not require any victim user action such as mounting filesystems or opening files.\nS:U - The use-after-free corrupts kernel heap memory within the same host kernel security boundary; it does not by itself cross VM, container runtime, or IOMMU isolation boundaries.\nC:H - After teardown, the orphaned GC work dereferences freed ip_set and htype structures (including embedded delayed_work), a classic slab UAF that enables heap grooming and arbitrary kernel memory disclosure.\nI:H - UAF on ipset hash control structures and hbucket data allows corrupting freed heap objects and building write primitives for control-flow hijacking and local privilege escalation beyond the caller\u0027s namespace.\nA:H - Dereferencing freed set, htype, and hash table memory from the GC workqueue can immediately trigger kernel oopses or panics, and the bug is repeatable on every destroy of a timeout hash ipset."
            }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72434",
    "datePublished": "2026-08-15T05:56:48.756Z",
    "dateReserved": "2026-08-09T03:40:39.929Z",
    "dateUpdated": "2026-08-17T05:44:09.822Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T13:21:16+00:00",
      "cve": "CVE-2026-72434",
      "id": "CVE-2026-72434",
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      "product_status:known_affected": "246",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: ipset: make sure gc is properly stopped",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72434.json",
      "version": "3"
    }
  }
}



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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.