CVE-2024-41066 (GCVE-0-2024-41066)
Vulnerability from cvelistv5
Published
2024-07-29 14:57
Modified
2026-08-05 11:35
Summary
In the Linux kernel, the following vulnerability has been resolved: ibmvnic: Add tx check to prevent skb leak Below is a summary of how the driver stores a reference to an skb during transmit: tx_buff[free_map[consumer_index]]->skb = new_skb; free_map[consumer_index] = IBMVNIC_INVALID_MAP; consumer_index ++; Where variable data looks like this: free_map == [4, IBMVNIC_INVALID_MAP, IBMVNIC_INVALID_MAP, 0, 3] consumer_index^ tx_buff == [skb=null, skb=<ptr>, skb=<ptr>, skb=null, skb=null] The driver has checks to ensure that free_map[consumer_index] pointed to a valid index but there was no check to ensure that this index pointed to an unused/null skb address. So, if, by some chance, our free_map and tx_buff lists become out of sync then we were previously risking an skb memory leak. This could then cause tcp congestion control to stop sending packets, eventually leading to ETIMEDOUT. Therefore, add a conditional to ensure that the skb address is null. If not then warn the user (because this is still a bug that should be patched) and free the old pointer to prevent memleak/tcp problems.
Impacted products
Vendor Product Version
Linux Linux Version: 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8
Version: 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8
Version: 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8
Version: 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8
Version: 1a64564eee05128f773930649edfdd50cbe80656
Version: 5142c39253385702a4de8f897027e1d76fc333de
Version: 5.12.17   
Version: 5.13.2   
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