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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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free in offloaded map/prog info fill\n\nWhen querying info for an offloaded BPF map or program,\nbpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()\nobtain the network namespace with get_net(dev_net(offmap-\u003enetdev)).\nHowever, the associated netdev\u0027s netns may be racing with teardown\nduring netns destruction. If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\n\n  refcount_t: addition on 0; use-after-free.\n\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\n\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed."
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If the netns refcount has already reached 0,\\nget_net() performs a refcount_t increment on 0, triggering:\\n\\n  refcount_t: addition on 0; use-after-free.\\n\\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\\nvalid, they cannot prevent the netns refcount from reaching zero.\\n\\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\\nzero, which causes ns_get_path_cb() to fail and the caller to return\\n-ENOENT -- the correct behavior when the netns is being 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    "redhat_vex": {
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      "cve": "CVE-2026-53089",
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      "source": "Red Hat CSAF VEX",
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      "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": "2026-09-15T02:02:50Z",
      "cve": "CVE-2026-53089",
      "id": "CVE-2026-53089",
      "initial_release_date": "2026-07-01T03:18:59Z",
      "product_status:first_fixed": "88",
      "product_status:known_affected": "731",
      "product_status:known_not_affected": "34",
      "product_status:recommended": "42",
      "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": "8"
    }
  }
}



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