Vulnerability-Lookup

FKIE_CVE-2026-90146

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-18 18:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf, xdp: move offload check into dev_xdp_install() bpf_xdp_link_update() calls dev_xdp_install() directly and skips dev_xdp_attach(), so the checks in dev_xdp_attach() do not run. A user can make an XDP link with a normal program and then swap in an offloaded or device-bound program with BPF_LINK_UPDATE, which puts it on the software path. dev_xdp_install() is the one place all three paths go through: "ip link set xdp" and BPF_LINK_CREATE reach it via dev_xdp_attach(), and BPF_LINK_UPDATE calls it directly. So move the program checks (offloaded, bound to another device, device-bound in generic mode, native vs generic, DEVMAP and CPUMAP) there, and keep only the netlink-flag check (XDP_FLAGS_UPDATE_IF_NOEXIST) in dev_xdp_attach().

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ea7b35dcc9430293b861bc7bad0c546f193c85f9",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            },
            {
              "lessThan": "03022dd874070768a7099f18b1944c633641315f",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            },
            {
              "lessThan": "ad27ed7d2309419a129078d781504f486b1b469a",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "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, xdp: move offload check into dev_xdp_install()\n\nbpf_xdp_link_update() calls dev_xdp_install() directly and skips\ndev_xdp_attach(), so the checks in dev_xdp_attach() do not run. A user can\nmake an XDP link with a normal program and then swap in an offloaded or\ndevice-bound program with BPF_LINK_UPDATE, which puts it on the software\npath.\n\ndev_xdp_install() is the one place all three paths go through:\n\"ip link set xdp\" and BPF_LINK_CREATE reach it via dev_xdp_attach(), and\nBPF_LINK_UPDATE calls it directly. So move the program checks (offloaded,\nbound to another device, device-bound in generic mode, native vs generic,\nDEVMAP and CPUMAP) there, and keep only the netlink-flag check\n(XDP_FLAGS_UPDATE_IF_NOEXIST) in dev_xdp_attach()."
    }
  ],
  "id": "CVE-2026-90146",
  "lastModified": "2026-09-18T18:17:43.987",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:17:07.490",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-90146 (GCVE-0-2026-90146)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-09-18 17:53

Title

bpf, xdp: move offload check into dev_xdp_install()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ea7b35dcc9430293b…
https://git.kernel.org/stable/c/03022dd874070768a…
https://git.kernel.org/stable/c/ad27ed7d2309419a1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 , < ea7b35dcc9430293b861bc7bad0c546f193c85f9 (git) Affected: 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 , < 03022dd874070768a7099f18b1944c633641315f (git) Affected: 026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74 , < ad27ed7d2309419a129078d781504f486b1b469a (git)
Linux	Linux	Affected: 5.9 Unaffected: 0 , < 5.9 (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": [
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ea7b35dcc9430293b861bc7bad0c546f193c85f9",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            },
            {
              "lessThan": "03022dd874070768a7099f18b1944c633641315f",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            },
            {
              "lessThan": "ad27ed7d2309419a129078d781504f486b1b469a",
              "status": "affected",
              "version": "026a4c28e1db3b0cb99cd9a3e495d4a8b632fa74",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.52",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, xdp: move offload check into dev_xdp_install()\n\nbpf_xdp_link_update() calls dev_xdp_install() directly and skips\ndev_xdp_attach(), so the checks in dev_xdp_attach() do not run. A user can\nmake an XDP link with a normal program and then swap in an offloaded or\ndevice-bound program with BPF_LINK_UPDATE, which puts it on the software\npath.\n\ndev_xdp_install() is the one place all three paths go through:\n\"ip link set xdp\" and BPF_LINK_CREATE reach it via dev_xdp_attach(), and\nBPF_LINK_UPDATE calls it directly. So move the program checks (offloaded,\nbound to another device, device-bound in generic mode, native vs generic,\nDEVMAP and CPUMAP) there, and keep only the netlink-flag check\n(XDP_FLAGS_UPDATE_IF_NOEXIST) in dev_xdp_attach()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled data is the replacement program fd on bpf(BPF_LINK_UPDATE), which __sys_bpf() dispatches to link_update() then bpf_xdp_link_update() in net/core/dev.c; that local syscall installs the prog, rather than a parsed ksmbd/nfsd/packet payload.\nAC:L - bpf_xdp_link_update() only compares prog-\u003etype and expected_attach_type, so BPF_LINK_CREATE of a normal XDP prog on a veth with XDP_FLAGS_SKB_MODE followed by BPF_LINK_UPDATE of a BPF_F_XDP_DEV_BOUND_ONLY prog that calls bpf_xdp_metadata_rx_* always bypasses the skipped dev_xdp_attach() checks, with no race.\nPR:L - bpf_prog_load() of BPF_PROG_TYPE_XDP requires bpf_token_capable(CAP_BPF) and bpf_token_capable(CAP_NET_ADMIN) before bpf_xdp_link_attach()/link_update(); those caps, and the CAP_NET_ADMIN to add the veth attach target, are obtainable in a user/netns via unshare and BPF token delegation, not only init-namespace root.\nUI:N - The attacker loads both programs, creates the XDP link, calls BPF_LINK_UPDATE, and then drives do_xdp_generic() by sending a frame through their own veth peer; no victim mount, file open, or other cooperative action is required.\nS:U - The confused metadata kfuncs (veth_xdp_rx_hash() and friends) run in the host kernel XDP path do_xdp_generic()/bpf_prog_run_generic_xdp() and corrupt host kernel memory; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - After the skipped bpf_prog_is_dev_bound() checks, a veth-bound program can run on generic XDP\u0027s stack struct xdp_buff; veth_xdp_rx_timestamp()/veth_xdp_rx_vlan_tag() cast it to veth_xdp_buff and read skb_hwtstamps()/vlan fields through that bogus skb pointer, an unbounded kernel read into BPF maps.\nI:H - The same confused veth_xdp_buff.skb is passed to skb_get_hash(), which writes hash/sw_hash/l4_hash via __skb_get_hash_net(); swapping a veth-bound prog onto mlx5 native XDP likewise treats mlx5e_xdp_buff.cqe as an sk_buff and writes into the CQE, which is type confusion with a kernel write.\nA:H - do_xdp_generic() allocates a bare struct xdp_buff, so the next RX after the bad BPF_LINK_UPDATE makes veth_xdp_rx_hash() or mlx5e_xdp_rx_timestamp() dereference adjacent stack/wrapper bytes as skb, cqe, or rq and oops; an offloaded prog swapped onto the software path also hits bpf_prog_warn_on_exec() per packet."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:53:23.835Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a"
        }
      ],
      "title": "bpf, xdp: move offload check into dev_xdp_install()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90146",
    "datePublished": "2026-09-17T16:06:41.695Z",
    "dateReserved": "2026-09-11T19:38:34.789Z",
    "dateUpdated": "2026-09-18T17:53:23.835Z",
    "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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FKIE_CVE-2026-90146

CVE-2026-90146 (GCVE-0-2026-90146)

Tags

Sightings

Nomenclature

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