CVE-2021-47237

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47237
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

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/290b0b6432e2599021db0b8d6046f756d931c29f Patch
https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b Patch
https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3 Patch
https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13 Patch
https://git.kernel.org/stable/c/a49cbb762ef20655f5c91abdc13658b0af5e159d Patch
https://git.kernel.org/stable/c/c16c4716a1b5ba4f83c7e00da457cba06761f119 Patch
https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5 Patch
https://git.kernel.org/stable/c/f4de2b43d13b7cf3ced9310e371b90c836dbd7cd Patch
https://git.kernel.org/stable/c/290b0b6432e2599021db0b8d6046f756d931c29f Patch
https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b Patch
https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3 Patch
https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13 Patch
https://git.kernel.org/stable/c/a49cbb762ef20655f5c91abdc13658b0af5e159d Patch
https://git.kernel.org/stable/c/c16c4716a1b5ba4f83c7e00da457cba06761f119 Patch
https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5 Patch
https://git.kernel.org/stable/c/f4de2b43d13b7cf3ced9310e371b90c836dbd7cd Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
History

30 Dec 2024, 19:05

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/290b0b6432e2599021db0b8d6046f756d931c29f - () https://git.kernel.org/stable/c/290b0b6432e2599021db0b8d6046f756d931c29f - Patch
References () https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b - () https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b - Patch
References () https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3 - () https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3 - Patch
References () https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13 - () https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13 - Patch
References () https://git.kernel.org/stable/c/a49cbb762ef20655f5c91abdc13658b0af5e159d - () https://git.kernel.org/stable/c/a49cbb762ef20655f5c91abdc13658b0af5e159d - Patch
References () https://git.kernel.org/stable/c/c16c4716a1b5ba4f83c7e00da457cba06761f119 - () https://git.kernel.org/stable/c/c16c4716a1b5ba4f83c7e00da457cba06761f119 - Patch
References () https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5 - () https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5 - Patch
References () https://git.kernel.org/stable/c/f4de2b43d13b7cf3ced9310e371b90c836dbd7cd - () https://git.kernel.org/stable/c/f4de2b43d13b7cf3ced9310e371b90c836dbd7cd - Patch
First Time Linux linux Kernel
Linux
CWE CWE-401
Information

Published : 2024-05-21 15:15

Updated : 2024-12-30 19:05

NVD link : CVE-2021-47237

Mitre link : CVE-2021-47237

CVE.ORG link : CVE-2021-47237

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime