CVE-2026-90348 (GCVE-0-2026-90348)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:02
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
Version: 3f14b73c38431a6a1ed24de568e18ed89b7082e2
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath10k/snoc.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump\n\nOn WCN3990/SNOC the MSA region is mapped with devm_memremap(MEMREMAP_WT).\nOn arm64 such a mapping is not Normal-cacheable, so unaligned accesses to\nit are not permitted. ath10k_msa_dump_memory() copies the region with a\nplain memcpy(), whose optimized __pi_memcpy_generic implementation issues\nwide/unaligned loads. This triggers an alignment fault (FSC=0x21) Oops in\nath10k_snoc_fw_crashed_dump() while collecting the devcoredump:\n\n  Unable to handle kernel paging request ... FSC=0x21: alignment fault\n  pc : __pi_memcpy_generic\n  lr : ath10k_snoc_fw_crashed_dump [ath10k_snoc]\n\nThe Oops both leaves the firmware RAM dump buffer zeroed (no dump is\ncaptured) and crashes the kernel, which in turn breaks modem SSR\nrecovery.\n\nUse memcpy_fromio(), which only performs accesses that are valid for such\na device-memory mapping. The generic memcpy_fromio() implementation aligns\nthe source before issuing word-sized reads and stores the destination with\nput_unaligned(), so it is also safe for the coherent DMA allocation used on\nthe non-reserved-memory path. ath11k and ath12k use the same pattern\nwhen copying target memory into crash dumps, so call it unconditionally\nhere too.\nThe MEMREMAP_WT pointer is a plain void *, so an explicit __iomem cast is\nneeded; use __force to keep sparse happy.\n\nTested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.3.7.c5-00107-QCAHLSWMTPL-1"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:02:05.059Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e5bc3658da9c8a535e3fa5c0c875b2a456954e81"
        },
        {
          "url": "https://git.kernel.org/stable/c/fed1f662c9f9fd19eeab6c01966b7b5a33804420"
        },
        {
          "url": "https://git.kernel.org/stable/c/838cab267ce9a975776e022f25094f8cbe1625d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb946595a58decdb4cab1b5f3c972ae66f41f1c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/152e894e90716163c646d70f86b3afeb70442783"
        },
        {
          "url": "https://git.kernel.org/stable/c/7039825a7479df637c4f5d546cb0e1cec18cd8e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/045d1bfb72d2631ab9ec74afa491aa788ebb57aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f25071afe9218aaae1c63fbf75e229aa6405319"
        }
      ],
      "title": "wifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90348",
    "datePublished": "2026-09-17T16:08:56.885Z",
    "dateReserved": "2026-09-11T19:38:34.805Z",
    "dateUpdated": "2026-10-19T09:02:05.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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