What happened
In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Mask the bd_cnt field in the TX BD properly The bd_cnt field in the TX BD specifies the total number of BDs for the TX packet. The bd_cnt field has 5 bits and the maximum number supported is 32 with the value 0. CONFIG_MAX_SKB_FRAGS can be modified and the total number of SKB fragments can approach or exceed the maximum supported by the chip. Add a macro to properly mask the bd_cnt field so that the value 32 will be properly masked and set to 0 in the bd_cnd field. Without this patch, the out-of-range bd_cnt value will corrupt the TX BD and may cause TX timeout. The next patch will check for values exceeding 32.
Affected versions
Linux: 3948b05950fdd64002a5f182c65ba5cf2d53cf71 through before 9ee185e0f15594017a6f1a191ebe6630cfea5f74 (git); 3948b05950fdd64002a5f182c65ba5cf2d53cf71 through before f60b41b815826f15c4d0323f923f398c423178d0 (git); 3948b05950fdd64002a5f182c65ba5cf2d53cf71 through before 107b25db61122d8f990987895c2912927b8b6e3f (git); 6.4 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.