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CVE-2022-3028: af_key: Do not call xfrm_probe_algs in parallel · torvalds/linux@ba953a9

A race condition was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem) when multiple calls to xfrm_probe_algs occurred simultaneously. This flaw could allow a local attacker to potentially trigger an out-of-bounds write or leak kernel heap memory by performing an out-of-bounds read and copying it into a socket.

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af_key: Do not call xfrm_probe_algs in parallel

When namespace support was added to xfrm/afkey, it caused the previously single-threaded call to xfrm_probe_algs to become multi-threaded. This is buggy and needs to be fixed with a mutex.

Reported-by: Abhishek Shah [email protected] Fixes: 283bc9f (“xfrm: Namespacify xfrm state/policy locks”) Signed-off-by: Herbert Xu [email protected] Signed-off-by: Steffen Klassert [email protected]

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