{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-47238", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47238", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-05-21T14:19:39.041Z", "updatedAt": "2026-05-23T15:19:33.973Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net: ipv4: fix memory leak in ip_mc_add1_src", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv4: fix memory leak in ip_mc_add1_src\n\nBUG: memory leak\nunreferenced object 0xffff888101bc4c00 (size 32):\n comm \"syz-executor527\", pid 360, jiffies 4294807421 (age 19.329s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................\n backtrace:\n [<00000000f17c5244>] kmalloc include/linux/slab.h:558 [inline]\n [<00000000f17c5244>] kzalloc include/linux/slab.h:688 [inline]\n [<00000000f17c5244>] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline]\n [<00000000f17c5244>] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095\n [<000000001cb99709>] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416\n [<0000000052cf19ed>] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline]\n [<0000000052cf19ed>] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423\n [<00000000477edfbc>] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857\n [<00000000e75ca9bb>] __sys_setsockopt+0x158/0x270 net/socket.c:2117\n [<00000000bdb993a8>] __do_sys_setsockopt net/socket.c:2128 [inline]\n [<00000000bdb993a8>] __se_sys_setsockopt net/socket.c:2125 [inline]\n [<00000000bdb993a8>] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125\n [<000000006a1ffdbd>] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47\n [<00000000b11467c4>] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nIn commit 24803f38a5c0 (\"igmp: do not remove igmp souce list info when set\nlink down\"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed,\nbecause it was also called in igmpv3_clear_delrec().\n\nRough callgraph:\n\ninetdev_destroy\n-> ip_mc_destroy_dev\n -> igmpv3_clear_delrec\n -> ip_mc_clear_src\n-> RCU_INIT_POINTER(dev->ip_ptr, NULL)\n\nHowever, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn't\nrelease in_dev->mc_list->sources. And RCU_INIT_POINTER() assigns the\nNULL to dev->ip_ptr. As a result, in_dev cannot be obtained through\ninetdev_by_index() and then in_dev->mc_list->sources cannot be released\nby ip_mc_del1_src() in the sock_close. Rough call sequence goes like:\n\nsock_close\n-> __sock_release\n -> inet_release\n -> ip_mc_drop_socket\n -> inetdev_by_index\n -> ip_mc_leave_src\n -> ip_mc_del_src\n -> ip_mc_del1_src\n\nSo we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free\nin_dev->mc_list->sources.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "0dc13e75507faa17ac9f7562b4ef7bf8fcd78422" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "6cff57eea3347f79f1867cc53e1093b6614138d8" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "1e28018b5c83d5073f74a6fb72eabe8370b2f501" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "3dd2aeac2e9624cff9fa634710837e4f2e352758" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "ac31cc837cafb57a271babad8ccffbf733caa076" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "77de6ee73f54a9a89c0afa0bf4c53b239aa9953a" }, { "version": "24803f38a5c0b6c57ed800b47e695f9ce474bc3a", "status": "affected", "versionType": "git", "lessThan": "d8e2973029b8b2ce477b564824431f3385c77083" }, { "version": "bd1b664a19403ede448d29c87b2f23796bc7a577", "status": "affected", "versionType": "git" }, { "version": "b38c6e0bd5b5e439ecebdc0df599d573c2f610f8", "status": "affected", "versionType": "git" }, { "version": "3.2.87", "status": "affected", "versionType": "semver", "lessThan": "3.3" }, { "version": "3.16.42", "status": "affected", "versionType": "semver", "lessThan": "3.17" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.9" }, { "version": "4.9.274", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.238", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.196", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.128", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.46", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.12.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.12.*" }, { "version": "5.13", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }