CVE-2021-47223
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2024-12-19 07:37
Severity ?
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7Patch
Impacted products
Vendor Product Version
Linux Linux Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
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   Linux Linux Version: 4.11
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         dataType: "CVE_RECORD",
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   },
}


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