CVE-2022-48999 (GCVE-0-2022-48999)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-08-05 08:53
VLAI
Title
ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference Gwangun Jung reported a slab-out-of-bounds access in fib_nh_match: fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961 fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753 inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874 Separate nexthop objects are mutually exclusive with the legacy multipath spec. Fix fib_nh_match to return if the config for the to be deleted route contains a multipath spec while the fib_info is using a nexthop object.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:15 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e , < cc3cd130ecfb8b0ae52e235e487bae3f16a24a32 (git)
Affected: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e , < 0b5394229ebae09afc07aabccb5ffd705ffd250e (git)
Affected: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e , < 25174d91e4a32a24204060d283bd5fa6d0ddf133 (git)
Affected: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e , < bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2 (git)
Affected: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e , < 61b91eb33a69c3be11b259c5ea484505cd79f883 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.226 , ≤ 5.4.* (semver)
Unaffected: 5.10.158 , ≤ 5.10.* (semver)
Unaffected: 5.15.82 , ≤ 5.15.* (semver)
Unaffected: 6.0.12 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: Handle attempt to delete multipath route when fib_info contains an nh reference\n\nGwangun Jung reported a slab-out-of-bounds access in fib_nh_match:\n    fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961\n    fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753\n    inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874\n\nSeparate nexthop objects are mutually exclusive with the legacy\nmultipath spec. Fix fib_nh_match to return if the config for the\nto be deleted route contains a multipath spec while the fib_info\nis using a nexthop object."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv4: Controlar el intento de eliminar una ruta multipath cuando fib_info contiene una referencia nh Gwangun Jung inform\u00f3 un acceso fuera de los l\u00edmites en fib_nh_match: fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961 fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753 inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874 Los objetos de siguiente salto separados son mutuamente excluyentes con la especificaci\u00f3n multipath heredada. Arreglar fib_nh_match para que regrese si la configuraci\u00f3n de la ruta que se va a eliminar contiene una especificaci\u00f3n de rutas m\u00faltiples mientras fib_info usa un objeto nexthop."
          }
        ],
        "id": "CVE-2022-48999",
        "lastModified": "2026-08-04T10:17:30.410",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "version": "3.1"
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              "impactScore": 5.2,
              "source": "nvd@nist.gov",
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                  {
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:15:25.948167Z",
                "version": "2.0.3"
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        "published": "2024-10-21T20:15:11.630",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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                "value": "CWE-125"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:46:20+00:00",
      "cve": "CVE-2022-48999",
      "id": "CVE-2022-48999",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48999.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-09-11T02:31:48Z",
      "cve": "CVE-2022-48999",
      "id": "CVE-2022-48999",
      "initial_release_date": "2024-10-22T14:22:35Z",
      "product_status:known_not_affected": "312",
      "product_status:recommended": "453",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48999",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48999.json",
      "version": "38"
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            },
            "title": "CISA ADP Vulnrichment"
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        ],
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                  "value": "AV:L - Triggered via RTM_DELROUTE over rtnetlink (inet_rtm_delroute \u2192 fib_table_delete \u2192 fib_nh_match), which requires a local process with a netlink socket, not remote packet processing.\nAC:L - An attacker can reliably create a nexthop-object route and then delete it with a legacy multipath nexthop spec; no races or attacker-uncontrollable conditions are required.\nPR:L - RTM_DELROUTE/RTM_NEWNEXTHOP require CAP_NET_ADMIN, but that capability is available to an unprivileged user inside a user+network namespace (netlink_net_capable checks the netns user_ns).\nUI:N - Exploitation needs no victim action; the attacker sets up the nexthop route and issues the delete themselves.\nS:U - Impact is confined to the local kernel networking stack authority; this is not a VM/IOMMU/sandbox boundary cross.\nC:H - The bug is a slab out-of-bounds read of struct fib_nh fields past a zero-length fib_nh[] allocation; with a multipath nexthop group, fib_info_num_path() expands the OOB window across adjacent slab memory.\nI:N - The vulnerable path only reads and compares OOB memory for route matching; there is no out-of-bounds write or memory-corruption write primitive.\nA:H - The slab OOB access can oops/panic the kernel when it hits unmapped or poisoned memory, matching the reported KASAN slab-out-of-bounds crash."
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}



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Sightings

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  • 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.
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  • 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.



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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.