gpio: eic-sprd: use raw_spinlock_t in the irq startup path

{
  "id": "873028350f06f6ee214fced23c89dfa4cf7bb9468adc262a35db5c2d0b135340",
  "url": "https://osv.dev/vulnerability/CVE-2026-64429",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "gpio: eic-sprd: use raw_spinlock_t in the irq startup path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: gpio: eic-sprd: use raw_spinlock_t in the irq startup path sprd_eic_irq_unmask() enables the GPIO IRQ and then updates controller state through sprd_eic_update(), which takes sprd_eic->lock with spin_lock_irqsave(). The callback can be reached from irq_startup() while setting up a requested IRQ. That path is not sleepable, but on PREEMPT_RT a regular spinlock_t becomes a sleeping lock. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the request_threaded_irq() -> __setup_irq() -> irq_startup() -> sprd_eic_irq_unmask() -> sprd_eic_update() carrier and used the original spin_lock_irqsave(&sprd_eic->lock) edge. Lockdep BUG: sleeping function called from invalid context hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv] sprd_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv] sprd_eic_update.constprop.0+0x48/0x90 [vuln_msv] sprd_eic_irq_unmask.constprop.0+0x35/0x50 [vuln_msv] __setup_irq.constprop.0+0xd/0x30 [vuln_msv] Convert the Spreadtrum EIC controller lock to raw_spinlock_t. The locked section only serializes MMIO register updates and does not contain sleepable operations, so keeping it non-sleeping is appropriate for the irqchip callbacks.",
    "evidence": "osv:CVE-2026-64429",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.178",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64429",
      "aliases": [
        "CVE-2026-64429"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "25518e024e3a6e5715d672f1daa91e1d100f7436"
                },
                {
                  "fixed": "96612bf2712cd961dbd9b52f3a9b4ab668f57628"
                },
                {
                  "fixed": "581ac2ad001ff1128931191f249a7f2074672b7a"
                },
                {
                  "fixed": "e244cd8b51001ba480f274c44dba9002813a4739"
                },
                {
                  "fixed": "19d63fd528719ce7d06d9aeb88d25b7d6478198a"
                },
                {
                  "fixed": "6112fba4150039ccd90e29f2d1b788c73ad7b3dd"
                },
                {
                  "fixed": "4750909a40da9016185e0ac991510a278cecb1e7"
                },
                {
                  "fixed": "5c3c9ec1172a4c3384b8b800b3a8896cc2c1b20e"
                },
                {
                  "fixed": "90f0109019e6817eb40a486671b7722d1544ae29"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64429.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.17.0"
                },
                {
                  "fixed": "5.10.261"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.212"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.178"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.145"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.39"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64429.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.904874433Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/19d63fd528719ce7d06d9aeb88d25b7d6478198a",
        "https://git.kernel.org/stable/c/4750909a40da9016185e0ac991510a278cecb1e7",
        "https://git.kernel.org/stable/c/581ac2ad001ff1128931191f249a7f2074672b7a",
        "https://git.kernel.org/stable/c/5c3c9ec1172a4c3384b8b800b3a8896cc2c1b20e",
        "https://git.kernel.org/stable/c/6112fba4150039ccd90e29f2d1b788c73ad7b3dd",
        "https://git.kernel.org/stable/c/90f0109019e6817eb40a486671b7722d1544ae29",
        "https://git.kernel.org/stable/c/96612bf2712cd961dbd9b52f3a9b4ab668f57628",
        "https://git.kernel.org/stable/c/e244cd8b51001ba480f274c44dba9002813a4739",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64429.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64429",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64429.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64429",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490320,
  "published_at": "2026-07-25T08:51:06.016+00:00"
}