CVE-2021-47085

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47085
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
CVSS

No CVSS.

References

No reference.

Configurations

No configuration.

History

19 Mar 2024, 14:15

Type Values Removed Values Added
Summary In the Linux kernel, the following vulnerability has been resolved: hamradio: improve the incomplete fix to avoid NPD The previous commit 3e0588c291d6 ("hamradio: defer ax25 kfree after unregister_netdev") reorder the kfree operations and unregister_netdev operation to prevent UAF. This commit improves the previous one by also deferring the nullify of the ax->tty pointer. Otherwise, a NULL pointer dereference bug occurs. Partial of the stack trace is shown below. BUG: kernel NULL pointer dereference, address: 0000000000000538 RIP: 0010:ax_xmit+0x1f9/0x400 ... Call Trace: dev_hard_start_xmit+0xec/0x320 sch_direct_xmit+0xea/0x240 __qdisc_run+0x166/0x5c0 __dev_queue_xmit+0x2c7/0xaf0 ax25_std_establish_data_link+0x59/0x60 ax25_connect+0x3a0/0x500 ? security_socket_connect+0x2b/0x40 __sys_connect+0x96/0xc0 ? __hrtimer_init+0xc0/0xc0 ? common_nsleep+0x2e/0x50 ? switch_fpu_return+0x139/0x1a0 __x64_sys_connect+0x11/0x20 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The crash point is shown as below static void ax_encaps(...) { ... set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); // ax->tty = NULL! ... } By placing the nullify action after the unregister_netdev, the ax->tty pointer won't be assigned as NULL net_device framework layer is well synchronized. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
References
  • {'url': 'https://git.kernel.org/stable/c/b68f41c6320b2b7fbb54a95f07a69f3dc7e56c59', 'name': 'https://git.kernel.org/stable/c/b68f41c6320b2b7fbb54a95f07a69f3dc7e56c59', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/371a874ea06f147d6ca30be43dad33683965eba6', 'name': 'https://git.kernel.org/stable/c/371a874ea06f147d6ca30be43dad33683965eba6', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/b2f37aead1b82a770c48b5d583f35ec22aabb61e', 'name': 'https://git.kernel.org/stable/c/b2f37aead1b82a770c48b5d583f35ec22aabb61e', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/03d00f7f1815ec00dab5035851b3de83afd054a8', 'name': 'https://git.kernel.org/stable/c/03d00f7f1815ec00dab5035851b3de83afd054a8', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/a5c6a13e9056d87805ba3042c208fbd4164ad22b', 'name': 'https://git.kernel.org/stable/c/a5c6a13e9056d87805ba3042c208fbd4164ad22b', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/a7b0ae2cc486fcb601f9f9d87d98138cc7b7f7f9', 'name': 'https://git.kernel.org/stable/c/a7b0ae2cc486fcb601f9f9d87d98138cc7b7f7f9', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/83ba6ec97c74fb1a60f7779a26b6a94b28741d8a', 'name': 'https://git.kernel.org/stable/c/83ba6ec97c74fb1a60f7779a26b6a94b28741d8a', 'tags': [], 'refsource': ''}
  • {'url': 'https://git.kernel.org/stable/c/7dd52af1eb5798f590d9d9e1c56ed8f5744ee0ca', 'name': 'https://git.kernel.org/stable/c/7dd52af1eb5798f590d9d9e1c56ed8f5744ee0ca', 'tags': [], 'refsource': ''}

04 Mar 2024, 18:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-03-04 18:15

Updated : 2024-04-16 18:56

NVD link : CVE-2021-47085

Mitre link : CVE-2021-47085

CVE.ORG link : CVE-2021-47085

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Products Affected

No product.

CWE

No CWE.