Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8 before 16ad1557cae582e79bb82dddd612d9bdfaa11d4c; affected 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8 before 267c61c4afed0ff9a2e83462abad3f41d8ca1f06; affected 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8 before e7b75def33eae61ddaad6cb616c517dc3882eb2a; affected 65d6470d139a6c1655fccb5cbacbeaba8e8ad2f8 before 0983d288caf984de0202c66641577b739caad561; affected 1a64564eee05128f773930649edfdd50cbe80656; affected 5142c39253385702a4de8f897027e1d76fc333de; affected 5.12.17 before 5.13; affected 5.13.2 before 5.14 |
| Linux / Linux | affected 5.14; unaffected 0 before 5.14; unaffected 6.1.101 through 6.1.*; unaffected 6.6.42 through 6.6.*; unaffected 6.9.11 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/16ad1557cae582e79bb82dddd612d9bdfaa11d4c
- https://git.kernel.org/stable/c/267c61c4afed0ff9a2e83462abad3f41d8ca1f06
- https://git.kernel.org/stable/c/e7b75def33eae61ddaad6cb616c517dc3882eb2a
- https://git.kernel.org/stable/c/0983d288caf984de0202c66641577b739caad561
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/16ad1557cae582e79bb82dddd612d9bdfaa11d4c
- https://git.kernel.org/stable/c/267c61c4afed0ff9a2e83462abad3f41d8ca1f06
- https://git.kernel.org/stable/c/e7b75def33eae61ddaad6cb616c517dc3882eb2a
- https://git.kernel.org/stable/c/0983d288caf984de0202c66641577b739caad561
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
No English description supplied.
No references supplied.