{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49871", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.238Z", "datePublished": "2025-05-01T14:10:21.760Z", "dateUpdated": "2026-05-11T19:08:21.371Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:08:21.371Z" }, "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 [<00000000c8f01748>] napi_skb_cache_get+0xd4/0x150\n [<0000000041c7fc09>] __napi_build_skb+0x15/0x50\n [<00000000431c7079>] __napi_alloc_skb+0x26e/0x540\n [<000000003ecfa30e>] napi_get_frags+0x59/0x140\n [<0000000099b2199e>] tun_get_user+0x183d/0x3bb0 [tun]\n [<000000008a5adef0>] tun_chr_write_iter+0xc0/0x1b1 [tun]\n [<0000000049993ff4>] do_iter_readv_writev+0x19f/0x320\n [<000000008f338ea2>] do_iter_write+0x135/0x630\n [<000000008a3377a4>] vfs_writev+0x12e/0x440\n [<00000000a6b5639a>] do_writev+0x104/0x280\n [<00000000ccf065d8>] do_syscall_64+0x3b/0x90\n [<00000000d776e329>] 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(&skb->list, &napi->rx_list);\n <-- While napi->rx_count < READ_ONCE(gro_normal_batch),\n <-- gro_normal_list() is not called, napi->rx_list is not empty\n <-- not ask to complete the gro work, will cause memory leaks in\n <-- following tun_napi_del()\n...\ntun_napi_del()\n netif_napi_del()\n __netif_napi_del()\n <-- &napi->rx_list is not empty, which caused memory leaks\n\nTo fix, add napi_complete() after napi_gro_frags()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/tun.c" ], "versions": [ { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "223ef6a94e52331a6a7ef31e59921e0e82d2d40a", "status": "affected", "versionType": "git" }, { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "a4f73f6adc53fd7a3f9771cbc89a03ef39b0b755", "status": "affected", "versionType": "git" }, { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "3401f964028ac941425b9b2c8ff8a022539ef44a", "status": "affected", "versionType": "git" }, { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "d7569302a7a52a9305d2fb054df908ff985553bb", "status": "affected", "versionType": "git" }, { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "8b12a020b20a78f62bedc50f26db3bf4fadf8cb9", "status": "affected", "versionType": "git" }, { "version": "90e33d45940793def6f773b2d528e9f3c84ffdc7", "lessThan": "1118b2049d77ca0b505775fc1a8d1909cf19a7ec", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/tun.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.267", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.225", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.155", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.79", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.9", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "4.19.267" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.4.225" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.155" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.79" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.0.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/223ef6a94e52331a6a7ef31e59921e0e82d2d40a" }, { "url": "https://git.kernel.org/stable/c/a4f73f6adc53fd7a3f9771cbc89a03ef39b0b755" }, { "url": "https://git.kernel.org/stable/c/3401f964028ac941425b9b2c8ff8a022539ef44a" }, { "url": "https://git.kernel.org/stable/c/d7569302a7a52a9305d2fb054df908ff985553bb" }, { "url": "https://git.kernel.org/stable/c/8b12a020b20a78f62bedc50f26db3bf4fadf8cb9" }, { "url": "https://git.kernel.org/stable/c/1118b2049d77ca0b505775fc1a8d1909cf19a7ec" } ], "title": "net: tun: Fix memory leaks of napi_get_frags", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-401", "lang": "en", "description": "CWE-401 Missing Release of Memory after Effective Lifetime" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-10-01T16:03:55.727122Z", "id": "CVE-2022-49871", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T16:03:58.029Z" } } ] } }