Vulnerability-Lookup

FKIE_CVE-2026-90393

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17

Severity

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/net_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d462b5481d77ce7df8a5ff89a699386f00c9214d",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "bdddf3e1493ee973619c154a57071ce67f78598b",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "79a66fd997d4eecf17302d613194879eb32e0986",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "f4ce6803df4095777191d800bebc50219b615ca0",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "277168cb9d153ce8e9c3f9275670e32ae61b41d6",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "bda86e9f31b9a296b6e64a51c91dc776fc9f613e",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "5c5997836381010fc5907b36bc17d3b19407e933",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/net_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

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

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09

Title

bpf: Fix potential UAF in bpf_netns_link_update_prog

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d462b5481d77ce7df…
https://git.kernel.org/stable/c/bdddf3e1493ee9736…
https://git.kernel.org/stable/c/79a66fd997d4eecf1…
https://git.kernel.org/stable/c/f4ce6803df4095777…
https://git.kernel.org/stable/c/277168cb9d153ce8e…
https://git.kernel.org/stable/c/bda86e9f31b9a296b…
https://git.kernel.org/stable/c/923f559e95b89b33c…
https://git.kernel.org/stable/c/5c5997836381010fc…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/net_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d462b5481d77ce7df8a5ff89a699386f00c9214d",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "bdddf3e1493ee973619c154a57071ce67f78598b",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "79a66fd997d4eecf17302d613194879eb32e0986",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "f4ce6803df4095777191d800bebc50219b615ca0",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "277168cb9d153ce8e9c3f9275670e32ae61b41d6",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "bda86e9f31b9a296b6e64a51c91dc776fc9f613e",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            },
            {
              "lessThan": "5c5997836381010fc5907b36bc17d3b19407e933",
              "status": "affected",
              "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/net_namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:26.388Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b"
        },
        {
          "url": "https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e"
        },
        {
          "url": "https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933"
        }
      ],
      "title": "bpf: Fix potential UAF in bpf_netns_link_update_prog",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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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.

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FKIE_CVE-2026-90393

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

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