fkie_cve-2022-49871
Vulnerability from fkie_nvd
Published
2025-05-01 15:16
Modified
2025-10-01 16:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1118b2049d77ca0b505775fc1a8d1909cf19a7ecPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/223ef6a94e52331a6a7ef31e59921e0e82d2d40aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3401f964028ac941425b9b2c8ff8a022539ef44aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b12a020b20a78f62bedc50f26db3bf4fadf8cb9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4f73f6adc53fd7a3f9771cbc89a03ef39b0b755Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7569302a7a52a9305d2fb054df908ff985553bbPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


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  "cveTags": [],
  "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()."
    },
    {
      "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": "2025-10-01T16:15:48.310",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "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"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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  "published": "2025-05-01T15:16:12.030",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-401"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
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}


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