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CVE-2022-49871 (GCVE-0-2022-49871)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-05-11 19:08
VLAI
Title
net: tun: Fix memory leaks of napi_get_frags
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tun: Fix memory leaks of napi_get_frags kmemleak reports after running test_progs: unreferenced object 0xffff8881b1672dc0 (size 232): comm "test_progs", pid 394388, jiffies 4354712116 (age 841.975s) hex dump (first 32 bytes): e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff .........,g..... 00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00 .@.............. backtrace: [<00000000c8f01748>] napi_skb_cache_get+0xd4/0x150 [<0000000041c7fc09>] __napi_build_skb+0x15/0x50 [<00000000431c7079>] __napi_alloc_skb+0x26e/0x540 [<000000003ecfa30e>] napi_get_frags+0x59/0x140 [<0000000099b2199e>] tun_get_user+0x183d/0x3bb0 [tun] [<000000008a5adef0>] tun_chr_write_iter+0xc0/0x1b1 [tun] [<0000000049993ff4>] do_iter_readv_writev+0x19f/0x320 [<000000008f338ea2>] do_iter_write+0x135/0x630 [<000000008a3377a4>] vfs_writev+0x12e/0x440 [<00000000a6b5639a>] do_writev+0x104/0x280 [<00000000ccf065d8>] do_syscall_64+0x3b/0x90 [<00000000d776e329>] entry_SYSCALL_64_after_hwframe+0x63/0xcd The issue occurs in the following scenarios: tun_get_user() napi_gro_frags() napi_frags_finish() case GRO_NORMAL: gro_normal_one() list_add_tail(&skb->list, &napi->rx_list); <-- While napi->rx_count < READ_ONCE(gro_normal_batch), <-- gro_normal_list() is not called, napi->rx_list is not empty <-- not ask to complete the gro work, will cause memory leaks in <-- following tun_napi_del() ... tun_napi_del() netif_napi_del() __netif_napi_del() <-- &napi->rx_list is not empty, which caused memory leaks To fix, add napi_complete() after napi_gro_frags().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 16:03 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < 223ef6a94e52331a6a7ef31e59921e0e82d2d40a (git)
Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < a4f73f6adc53fd7a3f9771cbc89a03ef39b0b755 (git)
Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < 3401f964028ac941425b9b2c8ff8a022539ef44a (git)
Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < d7569302a7a52a9305d2fb054df908ff985553bb (git)
Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < 8b12a020b20a78f62bedc50f26db3bf4fadf8cb9 (git)
Affected: 90e33d45940793def6f773b2d528e9f3c84ffdc7 , < 1118b2049d77ca0b505775fc1a8d1909cf19a7ec (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.155 , ≤ 5.10.* (semver)
Unaffected: 5.15.79 , ≤ 5.15.* (semver)
Unaffected: 6.0.9 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix memory leaks of napi_get_frags\n\nkmemleak reports after running test_progs:\n\nunreferenced object 0xffff8881b1672dc0 (size 232):\n  comm \"test_progs\", pid 394388, jiffies 4354712116 (age 841.975s)\n  hex dump (first 32 bytes):\n    e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff  .........,g.....\n    00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00  .@..............\n  backtrace:\n    [\u003c00000000c8f01748\u003e] napi_skb_cache_get+0xd4/0x150\n    [\u003c0000000041c7fc09\u003e] __napi_build_skb+0x15/0x50\n    [\u003c00000000431c7079\u003e] __napi_alloc_skb+0x26e/0x540\n    [\u003c000000003ecfa30e\u003e] napi_get_frags+0x59/0x140\n    [\u003c0000000099b2199e\u003e] tun_get_user+0x183d/0x3bb0 [tun]\n    [\u003c000000008a5adef0\u003e] tun_chr_write_iter+0xc0/0x1b1 [tun]\n    [\u003c0000000049993ff4\u003e] do_iter_readv_writev+0x19f/0x320\n    [\u003c000000008f338ea2\u003e] do_iter_write+0x135/0x630\n    [\u003c000000008a3377a4\u003e] vfs_writev+0x12e/0x440\n    [\u003c00000000a6b5639a\u003e] do_writev+0x104/0x280\n    [\u003c00000000ccf065d8\u003e] do_syscall_64+0x3b/0x90\n    [\u003c00000000d776e329\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe issue occurs in the following scenarios:\ntun_get_user()\n  napi_gro_frags()\n    napi_frags_finish()\n      case GRO_NORMAL:\n        gro_normal_one()\n          list_add_tail(\u0026skb-\u003elist, \u0026napi-\u003erx_list);\n          \u003c-- While napi-\u003erx_count \u003c READ_ONCE(gro_normal_batch),\n          \u003c-- gro_normal_list() is not called, napi-\u003erx_list is not empty\n  \u003c-- not ask to complete the gro work, will cause memory leaks in\n  \u003c-- following tun_napi_del()\n...\ntun_napi_del()\n  netif_napi_del()\n    __netif_napi_del()\n    \u003c-- \u0026napi-\u003erx_list is not empty, which caused memory leaks\n\nTo fix, add napi_complete() after napi_gro_frags()."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tun: Se corrigen las fugas de memoria de napi_get_frags que informa kmemleak tras ejecutar test_progs: objeto sin referencia 0xffff8881b1672dc0 (tama\u00f1o 232): comm \"test_progs\", pid 394388, jiffies 4354712116 (edad 841,975 s) volcado hexadecimal (primeros 32 bytes): e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff .........,g..... 00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00 .@.............. backtrace: [\u0026lt;00000000c8f01748\u0026gt;] napi_skb_cache_get+0xd4/0x150 [\u0026lt;0000000041c7fc09\u0026gt;] __napi_build_skb+0x15/0x50 [\u0026lt;00000000431c7079\u0026gt;] __napi_alloc_skb+0x26e/0x540 [\u0026lt;000000003ecfa30e\u0026gt;] napi_get_frags+0x59/0x140 [\u0026lt;0000000099b2199e\u0026gt;] tun_get_user+0x183d/0x3bb0 [tun] [\u0026lt;000000008a5adef0\u0026gt;] tun_chr_write_iter+0xc0/0x1b1 [tun] El problema ocurre en los siguientes escenarios: tun_get_user() napi_gro_frags() napi_frags_finish() caso GRO_NORMAL: gro_normal_one() list_add_tail(\u0026amp;skb-\u0026gt;list, \u0026amp;napi-\u0026gt;rx_list); \u0026lt;-- Mientras napi-\u0026gt;rx_count \u0026lt; READ_ONCE(gro_normal_batch), \u0026lt;-- gro_normal_list() no se llama, napi-\u0026gt;rx_list no est\u00e1 vac\u00edo \u0026lt;-- no solicita completar el trabajo de gro, causar\u00e1 p\u00e9rdidas de memoria en \u0026lt;-- siguientes tun_napi_del() ... tun_napi_del() netif_napi_del() __netif_napi_del() \u0026lt;-- \u0026amp;napi-\u0026gt;rx_list no est\u00e1 vac\u00edo, lo que caus\u00f3 p\u00e9rdidas de memoria Para corregirlo, agregue napi_complete() despu\u00e9s de napi_gro_frags()."
          }
        ],
        "id": "CVE-2022-49871",
        "lastModified": "2026-06-17T05:19:22.317",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
                "attackComplexity": "LOW",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
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          "ssvcV203": [
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
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                "options": [
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                  },
                  {
                    "automatable": "no"
                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T16:03:55.727122Z",
                "version": "2.0.3"
              }
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        },
        "published": "2025-05-01T15:16:12.030",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "tags": [
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          },
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            "tags": [
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
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            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:29:12+00:00",
      "cve": "CVE-2022-49871",
      "id": "CVE-2022-49871",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: tun: Fix memory leaks of napi_get_frags",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49871.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:29:02Z",
      "cve": "CVE-2022-49871",
      "id": "CVE-2022-49871",
      "initial_release_date": "2025-05-07T02:19:23Z",
      "product_status:known_affected": "445",
      "product_status:known_not_affected": "224",
      "product_status:recommended": "237",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49871",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49871.json",
      "version": "52"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
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                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-49871",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T16:03:55.727122Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-401",
                    "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T14:31:37.424Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/tun.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "versionType": "git"
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              "product": "Linux",
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                  "version": "4.15"
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                {
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                  "version": "0",
                  "versionType": "semver"
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                  "version": "4.19.267",
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                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.225",
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                {
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                  "status": "unaffected",
                  "version": "5.10.155",
                  "versionType": "semver"
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                {
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                  "status": "unaffected",
                  "version": "5.15.79",
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                {
                  "lessThanOrEqual": "6.0.*",
                  "status": "unaffected",
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                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.1",
                  "versionType": "original_commit_for_fix"
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          "cpeApplicability": [
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          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix memory leaks of napi_get_frags\n\nkmemleak reports after running test_progs:\n\nunreferenced object 0xffff8881b1672dc0 (size 232):\n  comm \"test_progs\", pid 394388, jiffies 4354712116 (age 841.975s)\n  hex dump (first 32 bytes):\n    e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff  .........,g.....\n    00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00  .@..............\n  backtrace:\n    [\u003c00000000c8f01748\u003e] napi_skb_cache_get+0xd4/0x150\n    [\u003c0000000041c7fc09\u003e] __napi_build_skb+0x15/0x50\n    [\u003c00000000431c7079\u003e] __napi_alloc_skb+0x26e/0x540\n    [\u003c000000003ecfa30e\u003e] napi_get_frags+0x59/0x140\n    [\u003c0000000099b2199e\u003e] tun_get_user+0x183d/0x3bb0 [tun]\n    [\u003c000000008a5adef0\u003e] tun_chr_write_iter+0xc0/0x1b1 [tun]\n    [\u003c0000000049993ff4\u003e] do_iter_readv_writev+0x19f/0x320\n    [\u003c000000008f338ea2\u003e] do_iter_write+0x135/0x630\n    [\u003c000000008a3377a4\u003e] vfs_writev+0x12e/0x440\n    [\u003c00000000a6b5639a\u003e] do_writev+0x104/0x280\n    [\u003c00000000ccf065d8\u003e] do_syscall_64+0x3b/0x90\n    [\u003c00000000d776e329\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe issue occurs in the following scenarios:\ntun_get_user()\n  napi_gro_frags()\n    napi_frags_finish()\n      case GRO_NORMAL:\n        gro_normal_one()\n          list_add_tail(\u0026skb-\u003elist, \u0026napi-\u003erx_list);\n          \u003c-- While napi-\u003erx_count \u003c READ_ONCE(gro_normal_batch),\n          \u003c-- gro_normal_list() is not called, napi-\u003erx_list is not empty\n  \u003c-- not ask to complete the gro work, will cause memory leaks in\n  \u003c-- following tun_napi_del()\n...\ntun_napi_del()\n  netif_napi_del()\n    __netif_napi_del()\n    \u003c-- \u0026napi-\u003erx_list is not empty, which caused memory leaks\n\nTo fix, add napi_complete() after napi_gro_frags()."
            }
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            "dateUpdated": "2025-05-04T08:47:23.635Z",
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        "cveId": "CVE-2022-49871",
        "datePublished": "2025-05-01T14:10:21.760Z",
        "dateReserved": "2025-05-01T14:05:17.238Z",
        "dateUpdated": "2025-10-01T16:03:58.029Z",
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}



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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

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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.
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  • 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.


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