5.5

CVE-2021-47223

net: bridge: fix vlan tunnel dst null pointer dereference

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.11 < 4.14.238
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.196
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.128
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.46
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.13
Linux ≫ Linux Kernel Version5.13 Updaterc1
Linux ≫ Linux Kernel Version5.13 Updaterc2
Linux ≫ Linux Kernel Version5.13 Updaterc3
Linux ≫ Linux Kernel Version5.13 Updaterc4
Linux ≫ Linux Kernel Version5.13 Updaterc5
Linux ≫ Linux Kernel Version5.13 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.143
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530
Patch
https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f
Patch
https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c
Patch
https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d
Patch
https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79
Patch
https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7
Patch