CVE-2022-50310 (GCVE-0-2022-50310)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2026-08-05 08:58
VLAI
Title
ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed If the initialization fails in calling addrconf_init_net(), devconf_all is the pointer that has been released. Then ip6mr_sk_done() is called to release the net, accessing devconf->mc_forwarding directly causes invalid pointer access. The process is as follows: setup_net() ops_init() addrconf_init_net() all = kmemdup(...) ---> alloc "all" ... net->ipv6.devconf_all = all; __addrconf_sysctl_register() ---> failed ... kfree(all); ---> ipv6.devconf_all invalid ... ops_exit_list() ... ip6mr_sk_done() devconf = net->ipv6.devconf_all; //devconf is invalid pointer if (!devconf || !atomic_read(&devconf->mc_forwarding)) The following is the Call Trace information: BUG: KASAN: use-after-free in ip6mr_sk_done+0x112/0x3a0 Read of size 4 at addr ffff888075508e88 by task ip/14554 Call Trace: <TASK> dump_stack_lvl+0x8e/0xd1 print_report+0x155/0x454 kasan_report+0xba/0x1f0 kasan_check_range+0x35/0x1b0 ip6mr_sk_done+0x112/0x3a0 rawv6_close+0x48/0x70 inet_release+0x109/0x230 inet6_release+0x4c/0x70 sock_release+0x87/0x1b0 igmp6_net_exit+0x6b/0x170 ops_exit_list+0xb0/0x170 setup_net+0x7ac/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f7963322547 </TASK> Allocated by task 14554: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0xa1/0xb0 __kmalloc_node_track_caller+0x4a/0xb0 kmemdup+0x28/0x60 addrconf_init_net+0x1be/0x840 ops_init+0xa5/0x410 setup_net+0x5aa/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 14554: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x40 ____kasan_slab_free+0x155/0x1b0 slab_free_freelist_hook+0x11b/0x220 __kmem_cache_free+0xa4/0x360 addrconf_init_net+0x623/0x840 ops_init+0xa5/0x410 setup_net+0x5aa/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7d9b1b578d67a14ae7a7a526ee115b233fa264c4 , < 22a68c3b9362eaac7b035eba09e95e6b3f7a912c (git)
Affected: 7d9b1b578d67a14ae7a7a526ee115b233fa264c4 , < 1ca695207ed2271ecbf8ee6c641970f621c157cc (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.0.6 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
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          ],
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            {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed\n\nIf the initialization fails in calling addrconf_init_net(), devconf_all is\nthe pointer that has been released. Then ip6mr_sk_done() is called to\nrelease the net, accessing devconf-\u003emc_forwarding directly causes invalid\npointer access.\n\nThe process is as follows:\nsetup_net()\n\tops_init()\n\t\taddrconf_init_net()\n\t\tall = kmemdup(...)           ---\u003e alloc \"all\"\n\t\t...\n\t\tnet-\u003eipv6.devconf_all = all;\n\t\t__addrconf_sysctl_register() ---\u003e failed\n\t\t...\n\t\tkfree(all);                  ---\u003e ipv6.devconf_all invalid\n\t\t...\n\tops_exit_list()\n\t\t...\n\t\tip6mr_sk_done()\n\t\t\tdevconf = net-\u003eipv6.devconf_all;\n\t\t\t//devconf is invalid pointer\n\t\t\tif (!devconf || !atomic_read(\u0026devconf-\u003emc_forwarding))\n\nThe following is the Call Trace information:\nBUG: KASAN: use-after-free in ip6mr_sk_done+0x112/0x3a0\nRead of size 4 at addr ffff888075508e88 by task ip/14554\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl+0x8e/0xd1\nprint_report+0x155/0x454\nkasan_report+0xba/0x1f0\nkasan_check_range+0x35/0x1b0\nip6mr_sk_done+0x112/0x3a0\nrawv6_close+0x48/0x70\ninet_release+0x109/0x230\ninet6_release+0x4c/0x70\nsock_release+0x87/0x1b0\nigmp6_net_exit+0x6b/0x170\nops_exit_list+0xb0/0x170\nsetup_net+0x7ac/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\nRIP: 0033:0x7f7963322547\n\n\u003c/TASK\u003e\nAllocated by task 14554:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\n__kasan_kmalloc+0xa1/0xb0\n__kmalloc_node_track_caller+0x4a/0xb0\nkmemdup+0x28/0x60\naddrconf_init_net+0x1be/0x840\nops_init+0xa5/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nFreed by task 14554:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\nkasan_save_free_info+0x2a/0x40\n____kasan_slab_free+0x155/0x1b0\nslab_free_freelist_hook+0x11b/0x220\n__kmem_cache_free+0xa4/0x360\naddrconf_init_net+0x623/0x840\nops_init+0xa5/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0"
        }
      ],
      "metrics": [
        {
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            "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"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is triggered through the local unshare(CLONE_NEWNET) syscall path (ksys_unshare \u2192 copy_net_ns \u2192 setup_net \u2192 addrconf_init_net failure \u2192 igmp6_net_exit \u2192 ip6mr_sk_done), not via network packet processing or adjacent-link protocols.\nAC:L - An unprivileged attacker can induce memory pressure to make __addrconf_sysctl_register() fail, then repeatedly call unshare to hit the dangling-devconf_all path; synchronize_rcu() between the free and use also gives a controllable heap-spray window, so success does not depend on conditions outside the attacker\u2019s influence.\nPR:L - Creating a network namespace only requires CAP_SYS_ADMIN in the caller\u2019s user namespace, which an unprivileged user obtains via unshare(CLONE_NEWUSER|CLONE_NEWNET); real init-namespace root is not required.\nUI:N - The attacker triggers the failing netns creation and cleanup entirely with their own unshare syscall; no separate victim action such as mounting a filesystem or opening a device is required.\nS:U - Impact is confined to the host kernel\u2019s memory/control-flow authority (use-after-free of ipv6_devconf in the same OS security domain), with no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - ip6mr_sk_done() performs a use-after-free read of the freed ipv6_devconf (mc_forwarding); with heap reuse after synchronize_rcu(), this UAF yields a high-impact kernel information-disclosure primitive per UAF scoring guidance.\nI:H - Use-after-free of a reclaimable slab object enables heap spraying and further corruption (including a potential atomic_dec write on sprayed non-zero mc_forwarding), which is scored as high integrity impact suitable for control-flow hijacking.\nA:H - The demonstrated KASAN use-after-free in ip6mr_sk_done causes a kernel oops/panic during netns setup rollback, fully denying system availability even when not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:08.862Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/22a68c3b9362eaac7b035eba09e95e6b3f7a912c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ca695207ed2271ecbf8ee6c641970f621c157cc"
        }
      ],
      "title": "ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50310",
    "datePublished": "2025-09-15T14:46:05.486Z",
    "dateReserved": "2025-09-15T14:18:36.813Z",
    "dateUpdated": "2026-08-05T08:58:08.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-10-01",
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      "percentile": "0.03785"
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                    "versionType": "original_commit_for_fix"
                  }
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "configurations": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed\n\nIf the initialization fails in calling addrconf_init_net(), devconf_all is\nthe pointer that has been released. Then ip6mr_sk_done() is called to\nrelease the net, accessing devconf-\u003emc_forwarding directly causes invalid\npointer access.\n\nThe process is as follows:\nsetup_net()\n\tops_init()\n\t\taddrconf_init_net()\n\t\tall = kmemdup(...)           ---\u003e alloc \"all\"\n\t\t...\n\t\tnet-\u003eipv6.devconf_all = all;\n\t\t__addrconf_sysctl_register() ---\u003e failed\n\t\t...\n\t\tkfree(all);                  ---\u003e ipv6.devconf_all invalid\n\t\t...\n\tops_exit_list()\n\t\t...\n\t\tip6mr_sk_done()\n\t\t\tdevconf = net-\u003eipv6.devconf_all;\n\t\t\t//devconf is invalid pointer\n\t\t\tif (!devconf || !atomic_read(\u0026devconf-\u003emc_forwarding))\n\nThe following is the Call Trace information:\nBUG: KASAN: use-after-free in ip6mr_sk_done+0x112/0x3a0\nRead of size 4 at addr ffff888075508e88 by task ip/14554\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl+0x8e/0xd1\nprint_report+0x155/0x454\nkasan_report+0xba/0x1f0\nkasan_check_range+0x35/0x1b0\nip6mr_sk_done+0x112/0x3a0\nrawv6_close+0x48/0x70\ninet_release+0x109/0x230\ninet6_release+0x4c/0x70\nsock_release+0x87/0x1b0\nigmp6_net_exit+0x6b/0x170\nops_exit_list+0xb0/0x170\nsetup_net+0x7ac/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\nRIP: 0033:0x7f7963322547\n\n\u003c/TASK\u003e\nAllocated by task 14554:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\n__kasan_kmalloc+0xa1/0xb0\n__kmalloc_node_track_caller+0x4a/0xb0\nkmemdup+0x28/0x60\naddrconf_init_net+0x1be/0x840\nops_init+0xa5/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nFreed by task 14554:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\nkasan_save_free_info+0x2a/0x40\n____kasan_slab_free+0x155/0x1b0\nslab_free_freelist_hook+0x11b/0x220\n__kmem_cache_free+0xa4/0x360\naddrconf_init_net+0x623/0x840\nops_init+0xa5/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0"
          }
        ],
        "id": "CVE-2022-50310",
        "lastModified": "2026-08-04T10:18:10.670",
        "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"
            },
            {
              "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": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-09-15T15:15:42.750",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1ca695207ed2271ecbf8ee6c641970f621c157cc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/22a68c3b9362eaac7b035eba09e95e6b3f7a912c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:39:40+00:00",
      "cve": "CVE-2022-50310",
      "id": "CVE-2022-50310",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50310.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:24:52Z",
      "cve": "CVE-2022-50310",
      "id": "CVE-2022-50310",
      "initial_release_date": "2025-09-16T23:34:00Z",
      "product_status:known_not_affected": "523",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50310",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50310.json",
      "version": "10"
    }
  }
}



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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.



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.