Description

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

bnxt_en: Fix out-of-bound memcpy() during ethtool -w

When retrieving the FW coredump using ethtool, it can sometimes cause
memory corruption:

BUG: KFENCE: memory corruption in __bnxt_get_coredump+0x3ef/0x670 [bnxt_en]
Corrupted memory at 0x000000008f0f30e8 [ ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ] (in kfence-#45):
__bnxt_get_coredump+0x3ef/0x670 [bnxt_en]
ethtool_get_dump_data+0xdc/0x1a0
__dev_ethtool+0xa1e/0x1af0
dev_ethtool+0xa8/0x170
dev_ioctl+0x1b5/0x580
sock_do_ioctl+0xab/0xf0
sock_ioctl+0x1ce/0x2e0
__x64_sys_ioctl+0x87/0xc0
do_syscall_64+0x5c/0xf0
entry_SYSCALL_64_after_hwframe+0x78/0x80

...

This happens when copying the coredump segment list in
bnxt_hwrm_dbg_dma_data() with the HWRM_DBG_COREDUMP_LIST FW command.
The info->dest_buf buffer is allocated based on the number of coredump
segments returned by the FW. The segment list is then DMA'ed by
the FW and the length of the DMA is returned by FW. The driver then
copies this DMA'ed segment list to info->dest_buf.

In some cases, this DMA length may exceed the info->dest_buf length
and cause the above BUG condition. Fix it by capping the copy
length to not exceed the length of info->dest_buf. The extra
DMA data contains no useful information.

This code path is shared for the HWRM_DBG_COREDUMP_LIST and the
HWRM_DBG_COREDUMP_RETRIEVE FW commands. The buffering is different
for these 2 FW commands. To simplify the logic, we need to move
the line to ...

Classification

CVE ID: CVE-2025-37911

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.06% (probability of being exploited)

EPSS Percentile: 17.55% (scored less or equal to compared to others)

EPSS Date: 2025-06-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-37911
https://git.kernel.org/stable/c/69b10dd23ab826d0c7f2d9ab311842251978d0c1
https://git.kernel.org/stable/c/43292b83424158fa6ec458799f3cb9c54d18c484
https://git.kernel.org/stable/c/4d69864915a3a052538e4ba76cd6fd77cfc64ebe
https://git.kernel.org/stable/c/44807af79efd0d78fa36383dd865ddfe7992c0a6
https://git.kernel.org/stable/c/44d81a9ebf0cad92512e0ffdf7412bfe20db66ec
https://git.kernel.org/stable/c/6b87bd94f34370bbf1dfa59352bed8efab5bf419

Timeline