CVE-2021-47237 (GCVE-0-2021-47237)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-05-11 13:50
VLAI
Title
net: hamradio: fix memory leak in mkiss_close
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hamradio: fix memory leak in mkiss_close My local syzbot instance hit memory leak in mkiss_open()[1]. The problem was in missing free_netdev() in mkiss_close(). In mkiss_open() netdevice is allocated and then registered, but in mkiss_close() netdevice was only unregistered, but not freed. Fail log: BUG: memory leak unreferenced object 0xffff8880281ba000 (size 4096): comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s) hex dump (first 32 bytes): 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0............. 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .'.*............ backtrace: [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0 [<ffffffff8706e7e8>] alloc_netdev_mqs+0x98/0xe80 [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1] [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110 [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670 [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440 [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200 [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0 [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff8880141a9a00 (size 96): comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s) hex dump (first 32 bytes): e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(.... 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@.......... backtrace: [<ffffffff8709f68b>] __hw_addr_create_ex+0x5b/0x310 [<ffffffff8709fb38>] __hw_addr_add_ex+0x1f8/0x2b0 [<ffffffff870a0c7b>] dev_addr_init+0x10b/0x1f0 [<ffffffff8706e88b>] alloc_netdev_mqs+0x13b/0xe80 [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1] [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110 [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670 [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440 [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200 [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0 [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff8880219bfc00 (size 512): comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s) hex dump (first 32 bytes): 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff ...(............ 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0 [<ffffffff8706eec7>] alloc_netdev_mqs+0x777/0xe80 [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1] [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110 [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670 [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440 [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200 [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0 [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff888029b2b200 (size 256): comm "syz-executor.1", pid 11443, jiffies 4295046091 (age 17.660s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0 [<ffffffff8706f062>] alloc_netdev_mqs+0x912/0xe80 [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1] [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110 [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670 [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440 [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200 [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0 [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:40 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < c634ba0b4159838ff45a60d3a0ace3b4118077a5 (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < 3942d0f9ace1a95a74930b5b4fc0e5005c62b37b (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < 765a8a04f828db7222b36a42b1031f576bfe95c3 (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < c16c4716a1b5ba4f83c7e00da457cba06761f119 (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < a49cbb762ef20655f5c91abdc13658b0af5e159d (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < 290b0b6432e2599021db0b8d6046f756d931c29f (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < f4de2b43d13b7cf3ced9310e371b90c836dbd7cd (git)
Affected: 815f62bf742718458ba822a7e1f51f285eb997f2 , < 7edcc682301492380fbdd604b4516af5ae667a13 (git)
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Linux Linux Affected: 2.6.14
Unaffected: 0 , < 2.6.14 (semver)
Unaffected: 4.4.274 , ≤ 4.4.* (semver)
Unaffected: 4.9.274 , ≤ 4.9.* (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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          "value": "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  .\u0027.*............\n  backtrace:\n    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706e7e8\u003e] alloc_netdev_mqs+0x98/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff8709f68b\u003e] __hw_addr_create_ex+0x5b/0x310\n    [\u003cffffffff8709fb38\u003e] __hw_addr_add_ex+0x1f8/0x2b0\n    [\u003cffffffff870a0c7b\u003e] dev_addr_init+0x10b/0x1f0\n    [\u003cffffffff8706e88b\u003e] alloc_netdev_mqs+0x13b/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706eec7\u003e] alloc_netdev_mqs+0x777/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706f062\u003e] alloc_netdev_mqs+0x912/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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  .\u0027.*............\n  backtrace:\n    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706e7e8\u003e] alloc_netdev_mqs+0x98/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff8709f68b\u003e] __hw_addr_create_ex+0x5b/0x310\n    [\u003cffffffff8709fb38\u003e] __hw_addr_add_ex+0x1f8/0x2b0\n    [\u003cffffffff870a0c7b\u003e] dev_addr_init+0x10b/0x1f0\n    [\u003cffffffff8706e88b\u003e] alloc_netdev_mqs+0x13b/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706eec7\u003e] alloc_netdev_mqs+0x777/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706f062\u003e] alloc_netdev_mqs+0x912/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
        },
        {
          "lang": "es",
          "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: hamradio: corrige la p\u00e9rdida de memoria en mkiss_close. Mi instancia local de syzbot tuvo una p\u00e9rdida de memoria en mkiss_open()[1]. El problema estaba en que faltaba free_netdev() en mkiss_close(). En mkiss_open() el dispositivo de red se asigna y luego se registra, pero en mkiss_close() el dispositivo de red solo se anula del registro, pero no se libera. Registro de errores: ERROR: p\u00e9rdida de memoria, objeto sin referencia 0xffff8880281ba000 (tama\u00f1o 4096): comunicaci\u00f3n \"syz-executor.1\", pid 11443, santiam\u00e9n 4295046091 (edad 17,660 s) volcado hexadecimal (primeros 32 bytes): 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0............. 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .\u0027.*....... .... seguimiento: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x98/0xe80 [] mkiss_open+0xb2/0x6f0 [] tty_ldisc_open+0x9b/0x110 [ ] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR : p\u00e9rdida de memoria objeto sin referencia 0xffff8880141a9a00 (tama\u00f1o 96): comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (edad 17.660s) volcado hexadecimal (primeros 32 bytes): e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(.... 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@....... .. seguimiento: [] __hw_addr_create_ex+0x5b/0x310 [] __hw_addr_add_ex+0x1f8/0x2b0 [] f0 [] alloc_netdev_mqs+0x13b/0xe80 [] mkiss_open +0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff8880219bfc00 (tama\u00f1o 512): comm \"syz-executor.1\", pid 11443, jiffies 95046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primeros 32 bytes): 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ...(............ 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x777/0xe80 [] mkiss_open+0xb2 /0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff888029b2b200 (tama\u00f1o 256): comm \"syz-executor.1\", pid 11443, jiffies 046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primero 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x912/0xe80 [] mkiss_open+0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+ 0x3a/0xb0 [] entrada_SYSCALL_64_after_hwframe+0x44/0xae"
        }
      ],
      "id": "CVE-2021-47237",
      "lastModified": "2024-12-30T19:05:28.320",
      "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"
            },
            "exploitabilityScore": 1.8,
            "impactScore": 3.6,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2024-05-21T15:15:12.930",
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.14"
                  },
                  {
                    "lessThan": "2.6.14",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.4.*",
                    "status": "unaffected",
                    "version": "4.4.274",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.9.*",
                    "status": "unaffected",
                    "version": "4.9.274",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.14.*",
                    "status": "unaffected",
                    "version": "4.14.238",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.19.*",
                    "status": "unaffected",
                    "version": "4.19.196",
                    "versionType": "semver"
                  },
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        "descriptions": [
          {
            "lang": "en",
            "value": "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  .\u0027.*............\n  backtrace:\n    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706e7e8\u003e] alloc_netdev_mqs+0x98/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff8709f68b\u003e] __hw_addr_create_ex+0x5b/0x310\n    [\u003cffffffff8709fb38\u003e] __hw_addr_add_ex+0x1f8/0x2b0\n    [\u003cffffffff870a0c7b\u003e] dev_addr_init+0x10b/0x1f0\n    [\u003cffffffff8706e88b\u003e] alloc_netdev_mqs+0x13b/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706eec7\u003e] alloc_netdev_mqs+0x777/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706f062\u003e] alloc_netdev_mqs+0x912/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: hamradio: corrige la p\u00e9rdida de memoria en mkiss_close. Mi instancia local de syzbot tuvo una p\u00e9rdida de memoria en mkiss_open()[1]. El problema estaba en que faltaba free_netdev() en mkiss_close(). En mkiss_open() el dispositivo de red se asigna y luego se registra, pero en mkiss_close() el dispositivo de red solo se anula del registro, pero no se libera. Registro de errores: ERROR: p\u00e9rdida de memoria, objeto sin referencia 0xffff8880281ba000 (tama\u00f1o 4096): comunicaci\u00f3n \"syz-executor.1\", pid 11443, santiam\u00e9n 4295046091 (edad 17,660 s) volcado hexadecimal (primeros 32 bytes): 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0............. 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .\u0027.*....... .... seguimiento: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x98/0xe80 [] mkiss_open+0xb2/0x6f0 [] tty_ldisc_open+0x9b/0x110 [ ] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR : p\u00e9rdida de memoria objeto sin referencia 0xffff8880141a9a00 (tama\u00f1o 96): comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (edad 17.660s) volcado hexadecimal (primeros 32 bytes): e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(.... 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@....... .. seguimiento: [] __hw_addr_create_ex+0x5b/0x310 [] __hw_addr_add_ex+0x1f8/0x2b0 [] f0 [] alloc_netdev_mqs+0x13b/0xe80 [] mkiss_open +0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff8880219bfc00 (tama\u00f1o 512): comm \"syz-executor.1\", pid 11443, jiffies 95046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primeros 32 bytes): 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ...(............ 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x777/0xe80 [] mkiss_open+0xb2 /0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff888029b2b200 (tama\u00f1o 256): comm \"syz-executor.1\", pid 11443, jiffies 046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primero 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x912/0xe80 [] mkiss_open+0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+ 0x3a/0xb0 [] entrada_SYSCALL_64_after_hwframe+0x44/0xae"
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        ],
        "id": "CVE-2021-47237",
        "lastModified": "2026-06-17T04:16:58.720",
        "metrics": {
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                "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",
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:40:03.924521Z",
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                  "content": {
                    "id": "CVE-2021-47237",
                    "options": [
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                      },
                      {
                        "Automatable": "no"
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
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              "product": "Linux",
              "programFiles": [
                "drivers/net/hamradio/mkiss.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "2.6.14"
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                  "version": "0",
                  "versionType": "semver"
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                  "version": "4.4.274",
                  "versionType": "semver"
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          "descriptions": [
            {
              "lang": "en",
              "value": "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  .\u0027.*............\n  backtrace:\n    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706e7e8\u003e] alloc_netdev_mqs+0x98/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff8709f68b\u003e] __hw_addr_create_ex+0x5b/0x310\n    [\u003cffffffff8709fb38\u003e] __hw_addr_add_ex+0x1f8/0x2b0\n    [\u003cffffffff870a0c7b\u003e] dev_addr_init+0x10b/0x1f0\n    [\u003cffffffff8706e88b\u003e] alloc_netdev_mqs+0x13b/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706eec7\u003e] alloc_netdev_mqs+0x777/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] 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    [\u003cffffffff81a27201\u003e] kvmalloc_node+0x61/0xf0\n    [\u003cffffffff8706f062\u003e] alloc_netdev_mqs+0x912/0xe80\n    [\u003cffffffff84e64192\u003e] mkiss_open+0xb2/0x6f0 [1]\n    [\u003cffffffff842355db\u003e] tty_ldisc_open+0x9b/0x110\n    [\u003cffffffff84236488\u003e] tty_set_ldisc+0x2e8/0x670\n    [\u003cffffffff8421f7f3\u003e] tty_ioctl+0xda3/0x1440\n    [\u003cffffffff81c9f273\u003e] __x64_sys_ioctl+0x193/0x200\n    [\u003cffffffff8911263a\u003e] do_syscall_64+0x3a/0xb0\n    [\u003cffffffff89200068\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
            }
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          "providerMetadata": {
            "dateUpdated": "2026-05-11T13:50:36.850Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5"
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            {
              "url": "https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b"
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              "url": "https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3"
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            },
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            },
            {
              "url": "https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13"
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          ],
          "title": "net: hamradio: fix memory leak in mkiss_close",
          "x_generator": {
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47237",
        "datePublished": "2024-05-21T14:19:38.396Z",
        "dateReserved": "2024-04-10T18:59:19.531Z",
        "dateUpdated": "2026-05-11T13:50:36.850Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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