CVE-2023-53516 (GCVE-0-2023-53516)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:46 – Updated: 2025-10-01 11:46
VLAI?
Title
macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF
Summary
In the Linux kernel, the following vulnerability has been resolved: macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff") added one additional attribute named IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff. However, it forgot to describe the nla_policy at macvlan_policy (drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer can be faked as empty (0 bytes) by a malicious user, which could leads to OOB in heap just like CVE-2023-3773. To fix it, this commit just completes the nla_policy description for IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the potential OOB read.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 79f44709aa7a744fbfbadd4aef678443290c6991 (git)
Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 55cef78c244d0d076f5a75a35530ca63c92f4426 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.4.8 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF\n\nThe previous commit 954d1fa1ac93 (\"macvlan: Add netlink attribute for\nbroadcast cutoff\") added one additional attribute named\nIFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.\n\nHowever, it forgot to describe the nla_policy at macvlan_policy\n(drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer\ncan be faked as empty (0 bytes) by a malicious user, which could leads\nto OOB in heap just like CVE-2023-3773.\n\nTo fix it, this commit just completes the nla_policy description for\nIFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the\npotential OOB read."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:46:03.878Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991"
        },
        {
          "url": "https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426"
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      ],
      "title": "macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF",
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    "datePublished": "2025-10-01T11:46:03.878Z",
    "dateReserved": "2025-10-01T11:39:39.406Z",
    "dateUpdated": "2025-10-01T11:46:03.878Z",
    "state": "PUBLISHED"
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