CVE-2024-45001

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: mana: Fix RX buf alloc_size alignment and atomic op panic

The MANA driver's RX buffer alloc_size is passed into napi_build_skb() to

create SKB. skb_shinfo(skb) is located at the end of skb, and its alignment

is affected by the alloc_size passed into napi_build_skb(). The size needs

to be aligned properly for better performance and atomic operations.

Otherwise, on ARM64 CPU, for certain MTU settings like 4000, atomic

operations may panic on the skb_shinfo(skb)->dataref due to alignment fault.

To fix this bug, add proper alignment to the alloc_size calculation.

Sample panic info:

[ 253.298819] Unable to handle kernel paging request at virtual address ffff000129ba5cce

[ 253.300900] Mem abort info:

[ 253.301760] ESR = 0x0000000096000021

[ 253.302825] EC = 0x25: DABT (current EL), IL = 32 bits

[ 253.304268] SET = 0, FnV = 0

[ 253.305172] EA = 0, S1PTW = 0

[ 253.306103] FSC = 0x21: alignment fault

C

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References