UBUNTU-CVE-2026-53151
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.
02 / AFFECTED SOFTWARE
Affected packages
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16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
51 explicit affected versions
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9 explicit affected versions
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11 explicit affected versions
40 explicit affected versions
19 explicit affected versions
14 explicit affected versions
7 explicit affected versions
7 explicit affected versions
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10 explicit affected versions
1 explicit affected versions
8 explicit affected versions
13 explicit affected versions
43 explicit affected versions
16 explicit affected versions
5 explicit affected versions
10 explicit affected versions
8 explicit affected versions
46 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
14 explicit affected versions
11 explicit affected versions
1 explicit affected versions
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41 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/333b6d5bb9f87827ac2639c737bf9613dbae7253
- https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00
- https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253
- https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4
- https://ubuntu.com/security/CVE-2026-53151
- https://ubuntu.com/security/notices/USN-8629-1
- https://ubuntu.com/security/notices/USN-8629-2
- https://ubuntu.com/security/notices/USN-8629-3
- https://ubuntu.com/security/notices/USN-8630-1
- https://ubuntu.com/security/notices/USN-8630-2
- https://ubuntu.com/security/notices/USN-8630-3
- https://ubuntu.com/security/notices/USN-8637-1
- https://www.cve.org/CVERecord?id=CVE-2026-53151