CVE-2026-53089 (GCVE-0-2026-53089)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-09-02 12:49
VLAI
Title
bpf: Fix use-after-free in offloaded map/prog info fill
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free in offloaded map/prog info fill When querying info for an offloaded BPF map or program, bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns() obtain the network namespace with get_net(dev_net(offmap->netdev)). However, the associated netdev's netns may be racing with teardown during netns destruction. If the netns refcount has already reached 0, get_net() performs a refcount_t increment on 0, triggering: refcount_t: addition on 0; use-after-free. Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains valid, they cannot prevent the netns refcount from reaching zero. Fix this by using maybe_get_net() instead of get_net(). maybe_get_net() uses refcount_inc_not_zero() and returns NULL if the refcount is already zero, which causes ns_get_path_cb() to fail and the caller to return -ENOENT -- the correct behavior when the netns is being destroyed.
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: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < 43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < 642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < fea55b034328feaafef75aee252f305e6f85a991 (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < 5662dac41a3442aa378d7c405164903eb109fc05 (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < 1a2dc103e16448d022a77ad5fc3234641436c4b7 (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < 85dc711f742b192eb97c0e00b521312f5a7a415e (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < a51e7fbe94a87e236631a83973d4f558310b2cd2 (git)
Affected: 675fc275a3a2d905535207237402c6d8dcb5fa4b , < a0c584fc18056709c8e047a82a6045d6c209f4ce (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix use-after-free in offloaded map/prog info fill",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53089.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-23T00:25:44Z",
      "cve": "CVE-2026-53089",
      "id": "CVE-2026-53089",
      "initial_release_date": "2026-07-01T03:18:59Z",
      "product_status:first_fixed": "68",
      "product_status:known_affected": "661",
      "product_status:known_not_affected": "34",
      "product_status:recommended": "130",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53089",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53089.json",
      "version": "11"
    }
  }
}



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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.



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.