CVE-2021-47084

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47084
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.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 (en) In the Linux kernel, the following vulnerability has been resolved: hamradio: defer ax25 kfree after unregister_netdev There is a possible race condition (use-after-free) like below (USE) | (FREE) ax25_sendmsg | ax25_queue_xmit | dev_queue_xmit | __dev_queue_xmit | __dev_xmit_skb | sch_direct_xmit | ... xmit_one | netdev_start_xmit | tty_ldisc_kill __netdev_start_xmit | mkiss_close ax_xmit | kfree ax_encaps | | Even though there are two synchronization primitives before the kfree: 1. wait_for_completion(&ax->dead). This can prevent the race with routines from mkiss_ioctl. However, it cannot stop the routine coming from upper layer, i.e., the ax25_sendmsg. 2. netif_stop_queue(ax->dev). It seems that this line of code aims to halt the transmit queue but it fails to stop the routine that already being xmit. This patch reorder the kfree after the unregister_netdev to avoid the possible UAF as the unregister_netdev() is well synchronized and won't return if there is a running routine. (en) Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
References
  • {'url': 'https://git.kernel.org/stable/c/3e0588c291d6ce225f2b891753ca41d45ba42469', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/450121075a6a6f1d50f97225d3396315309d61a1', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/896193a02a2981e60c40d4614fd095ce92135ccd', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/8a1a314965a17c62084a056b4f2cb7a770854c90', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/b5b193d0c67180fefdc664650138e3b7959df615', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/cb6c99aedd2c843056a598a8907a6128cb07603b', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/eaa816a86e629cbcc0a94f38391fee09231628c7', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • {'url': 'https://git.kernel.org/stable/c/ef5f7bfa19e3fc366f4c6d1a841ceaddf7a9f5d4', 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}

04 Mar 2024, 18:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-03-04 18:15

Updated : 2024-03-19 14:15

NVD link : CVE-2021-47084

Mitre link : CVE-2021-47084

CVE.ORG link : CVE-2021-47084

JSON object : View

Products Affected

No product.

CWE

No CWE.