{ "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-2021-47237", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47237", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-05-21T14:19:38.396Z", "updatedAt": "2026-05-11T13:50:36.850Z", "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: hamradio: fix memory leak in mkiss_close", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hamradio: fix memory leak in mkiss_close\n\nMy local syzbot instance hit memory leak in\nmkiss_open()[1]. The problem was in missing\nfree_netdev() in mkiss_close().\n\nIn mkiss_open() netdevice is allocated and then\nregistered, but in mkiss_close() netdevice was\nonly unregistered, but not freed.\n\nFail log:\n\nBUG: memory leak\nunreferenced object 0xffff8880281ba000 (size 4096):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0.............\n 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .'.*............\n backtrace:\n [] kvmalloc_node+0x61/0xf0\n [] alloc_netdev_mqs+0x98/0xe80\n [] mkiss_open+0xb2/0x6f0 [1]\n [] tty_ldisc_open+0x9b/0x110\n [] tty_set_ldisc+0x2e8/0x670\n [] tty_ioctl+0xda3/0x1440\n [] __x64_sys_ioctl+0x193/0x200\n [] do_syscall_64+0x3a/0xb0\n [] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880141a9a00 (size 96):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(....\n 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@..........\n backtrace:\n [] __hw_addr_create_ex+0x5b/0x310\n [] __hw_addr_add_ex+0x1f8/0x2b0\n [] dev_addr_init+0x10b/0x1f0\n [] alloc_netdev_mqs+0x13b/0xe80\n [] mkiss_open+0xb2/0x6f0 [1]\n [] tty_ldisc_open+0x9b/0x110\n [] tty_set_ldisc+0x2e8/0x670\n [] tty_ioctl+0xda3/0x1440\n [] __x64_sys_ioctl+0x193/0x200\n [] do_syscall_64+0x3a/0xb0\n [] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880219bfc00 (size 512):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff ...(............\n 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................\n backtrace:\n [] kvmalloc_node+0x61/0xf0\n [] alloc_netdev_mqs+0x777/0xe80\n [] mkiss_open+0xb2/0x6f0 [1]\n [] tty_ldisc_open+0x9b/0x110\n [] tty_set_ldisc+0x2e8/0x670\n [] tty_ioctl+0xda3/0x1440\n [] __x64_sys_ioctl+0x193/0x200\n [] do_syscall_64+0x3a/0xb0\n [] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff888029b2b200 (size 256):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [] kvmalloc_node+0x61/0xf0\n [] alloc_netdev_mqs+0x912/0xe80\n [] mkiss_open+0xb2/0x6f0 [1]\n [] tty_ldisc_open+0x9b/0x110\n [] tty_set_ldisc+0x2e8/0x670\n [] tty_ioctl+0xda3/0x1440\n [] __x64_sys_ioctl+0x193/0x200\n [] do_syscall_64+0x3a/0xb0\n [] entry_SYSCALL_64_after_hwframe+0x44/0xae", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "c634ba0b4159838ff45a60d3a0ace3b4118077a5" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "3942d0f9ace1a95a74930b5b4fc0e5005c62b37b" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "765a8a04f828db7222b36a42b1031f576bfe95c3" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "c16c4716a1b5ba4f83c7e00da457cba06761f119" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "a49cbb762ef20655f5c91abdc13658b0af5e159d" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "290b0b6432e2599021db0b8d6046f756d931c29f" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "f4de2b43d13b7cf3ced9310e371b90c836dbd7cd" }, { "version": "815f62bf742718458ba822a7e1f51f285eb997f2", "status": "affected", "versionType": "git", "lessThan": "7edcc682301492380fbdd604b4516af5ae667a13" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.14", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.14" }, { "version": "4.4.274", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.4.*" }, { "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": "*" } ] } ] } } }