ghsa-jfw6-w783-5hhm
Vulnerability from github
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().
{
"affected": [],
"aliases": [
"CVE-2022-49871"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T15:16:12Z",
"severity": null
},
"details": "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().",
"id": "GHSA-jfw6-w783-5hhm",
"modified": "2025-05-01T15:31:50Z",
"published": "2025-05-01T15:31:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49871"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1118b2049d77ca0b505775fc1a8d1909cf19a7ec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/223ef6a94e52331a6a7ef31e59921e0e82d2d40a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3401f964028ac941425b9b2c8ff8a022539ef44a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8b12a020b20a78f62bedc50f26db3bf4fadf8cb9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a4f73f6adc53fd7a3f9771cbc89a03ef39b0b755"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d7569302a7a52a9305d2fb054df908ff985553bb"
}
],
"schema_version": "1.4.0",
"severity": []
}
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
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