CVE-2026-90348 (GCVE-0-2026-90348)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
wifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < e5bc3658da9c8a535e3fa5c0c875b2a456954e81 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < fed1f662c9f9fd19eeab6c01966b7b5a33804420 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < 838cab267ce9a975776e022f25094f8cbe1625d2 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < eb946595a58decdb4cab1b5f3c972ae66f41f1c8 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < 152e894e90716163c646d70f86b3afeb70442783 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < 7039825a7479df637c4f5d546cb0e1cec18cd8e1 (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < 045d1bfb72d2631ab9ec74afa491aa788ebb57aa (git)
Affected: 3f14b73c38431a6a1ed24de568e18ed89b7082e2 , < 4f25071afe9218aaae1c63fbf75e229aa6405319 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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"
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/fed1f662c9f9fd19eeab6c01966b7b5a33804420"
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          "url": "https://git.kernel.org/stable/c/152e894e90716163c646d70f86b3afeb70442783"
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/4f25071afe9218aaae1c63fbf75e229aa6405319"
        }
      ],
      "title": "wifi: ath10k: snoc: use memcpy_fromio() for MSA ramdump",
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    "datePublished": "2026-09-17T16:08:56.885Z",
    "dateReserved": "2026-09-11T19:38:34.805Z",
    "dateUpdated": "2026-09-17T16:08:56.885Z",
    "state": "PUBLISHED"
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            "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"
          }
        ],
        "id": "CVE-2026-90348",
        "lastModified": "2026-09-17T17:17:33.553",
        "metrics": {},
        "published": "2026-09-17T17:17:33.553",
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            "url": "https://git.kernel.org/stable/c/e5bc3658da9c8a535e3fa5c0c875b2a456954e81"
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            "url": "https://git.kernel.org/stable/c/fed1f662c9f9fd19eeab6c01966b7b5a33804420"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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