In the Linux kernel, the following vulnerability has been resolved:
sch_cake: Fix out of bounds when parsing TCP options and header
The TCP option parser in cake qdisc (cake_get_tcpopt and cake_tcph_may_drop) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1.
This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options.").
v2 changes:
Added doff validation in cake_get_tcphdr to avoid parsing garbage as TCP header. Although it wasn't strictly an out-of-bounds access (memory was allocated), garbage values could be read where CAKE expected the TCP header if doff was smaller than 5.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | — | Jul 9, 2025 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-awsUpgrade linux-hwe-5.4Upgrade linux-oracleUpgrade linux-raspi-5.4Upgrade linux-gkeopUpgrade linux-gcp-5.4Upgrade linux-bluefieldUpgrade linux-azureUpgrade linux-kvmUpgrade linux-gcpUpgrade linux-azure-fipsUpgrade linux-azure-5.4Upgrade linux-raspiUpgrade linux-oracle-5.4Upgrade linux-aws-5.4Upgrade linux-fipsUpgrade linux | Nov 19, 2024 | May 21, 2024 |
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