Ubuntu Security Notice 3523-3 - Jann Horn discovered that the Berkeley Packet Filter implementation in the Linux kernel did not properly check the relationship between pointer values and the BPF stack. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Jann Horn discovered that the Berkeley Packet Filter implementation in the Linux kernel improperly performed sign extension in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
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