CVE-2026-90348

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

wifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump

On WCN3990/SNOC the MSA region is mapped with devm_memremap(MEMREMAP_WT). On arm64 such a mapping is not Normal-cacheable, so unaligned accesses to it are not permitted. ath10k_msa_dump_memory() copies the region with a plain memcpy(), whose optimized __pi_memcpy_generic implementation issues wide/unaligned loads. This triggers an alignment fault (FSC=0x21) Oops in ath10k_snoc_fw_crashed_dump() while collecting the devcoredump:

Unable to handle kernel paging request … FSC=0x21: alignment fault pc : __pi_memcpy_generic lr : ath10k_snoc_fw_crashed_dump [ath10k_snoc]

The Oops both leaves the firmware RAM dump buffer zeroed (no dump is captured) and crashes the kernel, which in turn breaks modem SSR recovery.

Use memcpy_fromio(), which only performs accesses that are valid for such a device-memory mapping. The generic memcpy_fromio() implementation aligns the source before issuing word-sized reads and stores the destination with put_unaligned(), so it is also safe for the coherent DMA allocation used on the non-reserved-memory path. ath11k and ath12k use the same pattern when copying target memory into crash dumps, so call it unconditionally here too. The MEMREMAP_WT pointer is a plain void *, so an explicit __iomem cast is needed; use __force to keep sparse happy.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.3.7.c5-00107-QCAHLSWMTPL-1

Affected Software

References

• https://git.kernel.org/stable/c/045d1bfb72d2631ab9ec74afa491aa788ebb57aa
• https://git.kernel.org/stable/c/152e894e90716163c646d70f86b3afeb70442783
• https://git.kernel.org/stable/c/4f25071afe9218aaae1c63fbf75e229aa6405319
• https://git.kernel.org/stable/c/7039825a7479df637c4f5d546cb0e1cec18cd8e1
• https://git.kernel.org/stable/c/838cab267ce9a975776e022f25094f8cbe1625d2
• https://git.kernel.org/stable/c/e5bc3658da9c8a535e3fa5c0c875b2a456954e81
• https://git.kernel.org/stable/c/eb946595a58decdb4cab1b5f3c972ae66f41f1c8
• https://git.kernel.org/stable/c/fed1f662c9f9fd19eeab6c01966b7b5a33804420