CVE-2026-90393 (GCVE-0-2026-90393)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09
VLAI
Title
bpf: Fix potential UAF in bpf_netns_link_update_prog
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < d462b5481d77ce7df8a5ff89a699386f00c9214d (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < bdddf3e1493ee973619c154a57071ce67f78598b (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < 79a66fd997d4eecf17302d613194879eb32e0986 (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < f4ce6803df4095777191d800bebc50219b615ca0 (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < 277168cb9d153ce8e9c3f9275670e32ae61b41d6 (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < bda86e9f31b9a296b6e64a51c91dc776fc9f613e (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < 923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7 (git)
Affected: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a , < 5c5997836381010fc5907b36bc17d3b19407e933 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF in bpf_netns_link_update_prog\n\nIn bpf_netns_link_update_prog, the checks for old_prog and prog type\nare currently performed locklessly before acquiring netns_bpf_mutex.\nThis creates a race condition that can lead to a UAF issue.\n\nIf two threads concurrently execute BPF_LINK_UPDATE on the same netns\nlink, the following execution path can trigger a UAF:\n\nCPU0                                          CPU1\nbpf_netns_link_update_prog\n  if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n    return -EPERM;\n                                              bpf_netns_link_update_prog\n                                                if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n                                                ...\n                                                old_prog = xchg(\u0026link-\u003eprog, new_prog);\n                                                bpf_prog_put(old_prog);\n  if (new_prog-\u003etype != link-\u003eprog-\u003etype) \u003c-- trigger UAF\n\nFix this by moving the old_prog and prog-\u003etype checks inside the\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify\nlock management and avoid all the goto jumping."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:26.388Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-90393",
    "datePublished": "2026-09-17T16:09:26.388Z",
    "dateReserved": "2026-09-11T19:38:34.810Z",
    "dateUpdated": "2026-09-17T16:09:26.388Z",
    "state": "PUBLISHED"
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      "date": "2026-09-29",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF in bpf_netns_link_update_prog\n\nIn bpf_netns_link_update_prog, the checks for old_prog and prog type\nare currently performed locklessly before acquiring netns_bpf_mutex.\nThis creates a race condition that can lead to a UAF issue.\n\nIf two threads concurrently execute BPF_LINK_UPDATE on the same netns\nlink, the following execution path can trigger a UAF:\n\nCPU0                                          CPU1\nbpf_netns_link_update_prog\n  if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n    return -EPERM;\n                                              bpf_netns_link_update_prog\n                                                if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n                                                ...\n                                                old_prog = xchg(\u0026link-\u003eprog, new_prog);\n                                                bpf_prog_put(old_prog);\n  if (new_prog-\u003etype != link-\u003eprog-\u003etype) \u003c-- trigger UAF\n\nFix this by moving the old_prog and prog-\u003etype checks inside the\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify\nlock management and avoid all the goto jumping."
          }
        ],
        "id": "CVE-2026-90393",
        "lastModified": "2026-09-17T17:17:38.903",
        "metrics": {},
        "published": "2026-09-17T17:17:38.903",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "url": "https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-22T16:28:58Z",
      "cve": "CVE-2026-90393",
      "id": "CVE-2026-90393",
      "initial_release_date": "2026-09-22T16:28:58Z",
      "product_status:known_affected": "284",
      "product_status:known_not_affected": "63",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90393",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90393.json",
      "version": "2"
    }
  }
}



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