CVE - CVE-2021-47223

CVE-ID
CVE-2021-47223	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530 URL:https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530 MISC:https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f URL:https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f MISC:https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c URL:https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c MISC:https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d URL:https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d MISC:https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79 URL:https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79 MISC:https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7 URL:https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7
Assigning CNA
kernel.org
Date Record Created
20240410	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240410)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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