Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the ACK parser to extract the SACK table for parsing Fix modification of the received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of the buffer in a fragmented UDP packet (the packet would probably have to be deliberately pre-generated as fragmented) when AF_RXRPC tries to extract the contents of the SACK table by copying out the contents of the SACK table into a buffer before attempting to parse AF_RXRPC assumes that it can just call skb_condense() and then validly access the SACK table from skb->data and that it will be a flat buffer - but skb_condense() can silently fail to do anything under some circumstances. Note that whilst rxrpc_input_soft_acks() should be able to parse extended ACKs, the rest of AF_RXRPC doesn't currently support that. Further, there's then no need to call skb_condense() in rxrpc_input_ack(), so don't.
Product status
d57a3a151660902091491ac2633134e1be92557f (git) before 566c4c1244de50fbff1f89ff93c9d7b0fc256db4
d57a3a151660902091491ac2633134e1be92557f (git) before 224298450be5c04d2a6ea1c2a94669d7ebf65d00
d57a3a151660902091491ac2633134e1be92557f (git) before 333b6d5bb9f87827ac2639c737bf9613dbae7253
6.2
Any version before 6.2
6.18.36 (semver)
7.0.13 (semver)
7.1 (original_commit_for_fix)
References
git.kernel.org/...c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4
git.kernel.org/...c/224298450be5c04d2a6ea1c2a94669d7ebf65d00
git.kernel.org/...c/333b6d5bb9f87827ac2639c737bf9613dbae7253