CVE-2026-63860 (GCVE-0-2026-63860)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
Title
RDMA/core: Prefer NLA_NUL_STRING
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Prefer NLA_NUL_STRING These attributes are evaluated as c-string (passed to strcmp), but NLA_STRING doesn't check for the presence of a \0 terminator. Either this needs to switch to nla_strcmp() and needs to adjust printf fmt specifier to not use plain %s, or this needs to use NLA_NUL_STRING. As the code has been this way for long time, it seems to me that userspace does include the terminating nul, even tough its not enforced so far, and thus NLA_NUL_STRING use is the simpler solution.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 87111356d58d86edb221ba144d261ed83a5b8bbe (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < abda65bdd13084c771842adaac1f652d0660dd82 (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 137b5918931d4d05aa8ea8d3adf67f7224eef63c (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 5877c043398d5fa0e93919a3d837e5cd7a98a961 (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < f2c7b39dde2e61df8157066969cc2a408cd3dcd9 (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < c26a0052cceed4c4d380ee5808b699f937fb58d8 (git)
Affected: 30dc5e63d6a5ad24894b5512d10b228d73645a44 , < 6ed3d14fc45d3da6025e7fe4a6a09066856698e2 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The bug is reached when userspace sends crafted NETLINK_RDMA (protocol 20) messages to the iWARP Port Mapper netlink handlers in `iwpm_register_pid_cb()` and `iwpm_mapping_info_cb()`, not from remote network packets.\nAC:L - An attacker fully controls the netlink attribute payload and can send a maximal-length string without a NUL terminator to reliably trigger unbounded `strcmp()` reads; no race or victim-dependent state is required beyond reaching the handler.\nPR:N - IWPM netlink ops lack `RDMA_NL_ADMIN_PERM`, and `netlink_sendmsg()` only enforces `CAP_NET_ADMIN` when `dst_pid` or `dst_group` is non-zero, so an unprivileged local process can send messages to the kernel RDMA netlink socket without capabilities or user-namespace tricks.\nUI:N - Exploitation requires only a local process sending a crafted netlink message; no victim interaction such as mounting a filesystem or opening a device is needed.\nS:U - Impact is confined to kernel RDMA/iWARP port-mapper state (e.g., `iwpm_user_pid`, mapping tables) within the same kernel security authority and does not cross VM, container, or IOMMU boundaries.\nC:H - `NLA_STRING` does not enforce a NUL terminator, yet `strcmp()` reads until `\\0`, causing an out-of-bounds kernel read past the attribute boundary; error paths also pass the pointer to `%s` in `pr_info()`, enabling further kernel memory disclosure.\nI:H - By sending exactly 19 bytes of `iWarpPortMapperUser` without a terminator, an attacker can make `strcmp()` read a NUL from NLA padding and pass validation, hijacking `iwpm_user_pid` and redirecting subsequent iWARP port-mapping operations to attacker-controlled userspace.\nA:H - Unbounded `strcmp()` on a non-NUL-terminated netlink attribute can read beyond the skb buffer and trigger a kernel page fault/oops, and successful port-mapper impersonation can disrupt iWARP connectivity on affected systems."
            }
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    "datePublished": "2026-07-19T14:04:48.153Z",
    "dateReserved": "2026-07-19T07:54:57.017Z",
    "dateUpdated": "2026-08-05T12:36:38.134Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Prefer NLA_NUL_STRING\n\nThese attributes are evaluated as c-string (passed to strcmp), but\nNLA_STRING doesn\u0027t check for the presence of a \\0 terminator.\n\nEither this needs to switch to nla_strcmp() and needs to adjust printf fmt\nspecifier to not use plain %s, or this needs to use NLA_NUL_STRING.\n\nAs the code has been this way for long time, it seems to me that userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution."
          }
        ],
        "id": "CVE-2026-63860",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-07-19T15:16:52.850",
        "references": [
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            "url": "https://git.kernel.org/stable/c/137b5918931d4d05aa8ea8d3adf67f7224eef63c"
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            "url": "https://git.kernel.org/stable/c/c26a0052cceed4c4d380ee5808b699f937fb58d8"
          },
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        "vulnStatus": "Awaiting Analysis"
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      "current_release_date": "2026-07-22T07:05:56+00:00",
      "cve": "CVE-2026-63860",
      "id": "CVE-2026-63860",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/core: Prefer NLA_NUL_STRING",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63860.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:47:19Z",
      "cve": "CVE-2026-63860",
      "id": "CVE-2026-63860",
      "initial_release_date": "2026-07-24T02:13:25Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "721",
      "product_status:known_not_affected": "12",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63860",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63860.json",
      "version": "9"
    }
  }
}



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Tags
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.


Related by attack behaviour

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.