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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        {
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          "programFiles": [
            "net/netfilter/ipset/ip_set_hash_gen.h"
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      "cpeApplicability": [
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          "nodes": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: make sure gc is properly stopped\n\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc."
        }
      ],
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            "version": "3.1"
          },
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              "lang": "en",
              "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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          "url": "https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53"
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    "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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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: make sure gc is properly stopped\n\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc."
          }
        ],
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        "lastModified": "2026-08-17T06:19:10.710",
        "metrics": {
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72434.json",
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    }
  }
}



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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.



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.