CVE-2026-46132 (GCVE-0-2026-46132)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:56
VLAI
Title
net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo
Summary
In the Linux kernel, the following vulnerability has been resolved: net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo rtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack without initialisation: struct ifla_vf_broadcast vf_broadcast; The struct contains a single fixed 32-byte field: /* include/uapi/linux/if_link.h */ struct ifla_vf_broadcast { __u8 broadcast[32]; }; The function then copies dev->broadcast into it using dev->addr_len as the length: memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); On Ethernet devices (the overwhelming majority of SR-IOV NICs) dev->addr_len is 6, so only the first 6 bytes of broadcast[] are written. The remaining 26 bytes retain whatever was previously on the kernel stack. The full struct is then handed to userspace via: nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) leaking up to 26 bytes of uninitialised kernel stack per VF per RTM_GETLINK request, repeatable. The other vf_* structs in the same function are explicitly zeroed for exactly this reason - see the memset() calls for ivi, vf_vlan_info, node_guid and port_guid a few lines above. vf_broadcast was simply missed when it was added. Reachability: any unprivileged local process can open AF_NETLINK / NETLINK_ROUTE without capabilities and send RTM_GETLINK with an IFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks each VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per VF per request. Stack residue at this call site can include return addresses and transient sensitive data; KASAN with stack instrumentation, or KMSAN, will flag the nla_put() when reproduced. Zero the on-stack struct before the partial memcpy, matching the existing pattern used for the other vf_* structs in the same function.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < 14271b401ec6a4bf0d88054106fc2956084717e1 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < cccce3190ba4356432b9f22369b56123d3d89f0d (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < a44fbb631cba646532f3948636626f81717365a7 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < 0653c0516234c8258975d268a749115fc0f0ff00 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < fbe0e6197225e6a83cf113a67a4b425f8de0bcd5 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < 38bcc21f52246badb3154b6158dcb381d98de011 (git)
Affected: 75345f888f700c4ab2448287e35d48c760b202e6 , < 4b9e327991815e128ad3af75c3a04630a63ce3e0 (git)
Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo\n\nrtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack\nwithout initialisation:\n\n\tstruct ifla_vf_broadcast vf_broadcast;\n\nThe struct contains a single fixed 32-byte field:\n\n\t/* include/uapi/linux/if_link.h */\n\tstruct ifla_vf_broadcast {\n\t\t__u8 broadcast[32];\n\t};\n\nThe function then copies dev-\u003ebroadcast into it using dev-\u003eaddr_len\nas the length:\n\n\tmemcpy(vf_broadcast.broadcast, dev-\u003ebroadcast, dev-\u003eaddr_len);\n\nOn Ethernet devices (the overwhelming majority of SR-IOV NICs)\ndev-\u003eaddr_len is 6, so only the first 6 bytes of broadcast[] are\nwritten. The remaining 26 bytes retain whatever was previously on\nthe kernel stack. The full struct is then handed to userspace via:\n\n\tnla_put(skb, IFLA_VF_BROADCAST,\n\t\tsizeof(vf_broadcast), \u0026vf_broadcast)\n\nleaking up to 26 bytes of uninitialised kernel stack per VF per\nRTM_GETLINK request, repeatable.\n\nThe other vf_* structs in the same function are explicitly zeroed\nfor exactly this reason - see the memset() calls for ivi,\nvf_vlan_info, node_guid and port_guid a few lines above.\nvf_broadcast was simply missed when it was added.\n\nReachability: any unprivileged local process can open AF_NETLINK /\nNETLINK_ROUTE without capabilities and send RTM_GETLINK with an\nIFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks\neach VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per\nVF per request. Stack residue at this call site can include return\naddresses and transient sensitive data; KASAN with stack\ninstrumentation, or KMSAN, will flag the nla_put() when reproduced.\n\nZero the on-stack struct before the partial memcpy, matching the\nexisting pattern used for the other vf_* structs in the same\nfunction."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:56:50.522Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0"
        }
      ],
      "title": "net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo",
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    "dateReserved": "2026-05-13T15:03:33.099Z",
    "dateUpdated": "2026-06-14T17:56:50.522Z",
    "state": "PUBLISHED"
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      "current_release_date": "2026-06-09T14:41:30.000Z",
      "cve": "CVE-2026-46132",
      "id": "msrc_CVE-2026-46132",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46132.json",
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The remaining 26 bytes retain whatever was previously on\\nthe kernel stack. The full struct is then handed to userspace via:\\n\\n\\tnla_put(skb, IFLA_VF_BROADCAST,\\n\\t\\tsizeof(vf_broadcast), \u0026vf_broadcast)\\n\\nleaking up to 26 bytes of uninitialised kernel stack per VF per\\nRTM_GETLINK request, repeatable.\\n\\nThe other vf_* structs in the same function are explicitly zeroed\\nfor exactly this reason - see the memset() calls for ivi,\\nvf_vlan_info, node_guid and port_guid a few lines above.\\nvf_broadcast was simply missed when it was added.\\n\\nReachability: any unprivileged local process can open AF_NETLINK /\\nNETLINK_ROUTE without capabilities and send RTM_GETLINK with an\\nIFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks\\neach VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per\\nVF per request. Stack residue at this call site can include return\\naddresses and transient sensitive data; KASAN with stack\\ninstrumentation, or KMSAN, will flag the nla_put() when reproduced.\\n\\nZero the on-stack struct before the partial memcpy, matching the\\nexisting pattern used for the other vf_* structs in the same\\nfunction.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/rtnetlink.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"14271b401ec6a4bf0d88054106fc2956084717e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"cccce3190ba4356432b9f22369b56123d3d89f0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"a44fbb631cba646532f3948636626f81717365a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"0653c0516234c8258975d268a749115fc0f0ff00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"fbe0e6197225e6a83cf113a67a4b425f8de0bcd5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"38bcc21f52246badb3154b6158dcb381d98de011\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"75345f888f700c4ab2448287e35d48c760b202e6\",\"lessThan\":\"4b9e327991815e128ad3af75c3a04630a63ce3e0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/rtnetlink.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"24B3A7BD-AD4C-4029-A7C0-87FA0CB1BFEB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.7\",\"matchCriteriaId\":\"D0893CA7-9AE6-4DFE-AC75-48967D73AD8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-27T16:20:53+00:00",
      "cve": "CVE-2026-46132",
      "id": "CVE-2026-46132",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46132.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:55:03Z",
      "cve": "CVE-2026-46132",
      "id": "CVE-2026-46132",
      "initial_release_date": "2026-05-29T01:16:36Z",
      "product_status:known_affected": "173",
      "product_status:known_not_affected": "65",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46132",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46132.json",
      "version": "7"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.