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FKIE_CVE-2026-80768

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: ft260: fix stack-use-after-return write in I2C read race ft260_i2c_read() points dev->read_buf at a caller-supplied buffer (often an on-stack variable), arms a completion and waits up to five seconds for the device to return the data. The HID input callback ft260_raw_event() runs in the input/IRQ path, independent of the dev->lock mutex held by the read path, and copies the device-supplied payload into dev->read_buf after a plain NULL check. These two paths share read_buf, read_idx and read_len with no serialization. If the device delays its response until the read times out, ft260_i2c_read() resets the controller, clears read_buf and returns, unwinding the stack frame the buffer lived in. A response that arrives at that moment lets ft260_raw_event() pass the NULL check and then memcpy() the device-controlled payload into the now-freed stack location, a bounded but attacker-influenced stack-use-after-return write triggerable by malicious or malfunctioning hardware. Add a dedicated spinlock that serializes every access to read_buf, read_idx and read_len. ft260_raw_event() now holds it across the NULL check, the memcpy and the index update, while the read path takes it when arming and when clearing the buffer, so the teardown can no longer slip between the check and the copy.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b907001e8a83cdb71e899fd3d77ab51e2c03f10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/460514d46e8892189fc933a1b4433811cfa5c309
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5aa5a1b7cc4b4bec5497ad9ef113fdfe37b232f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77832d8f1c81d9f84b6b54807fb278586001d754
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90e9298f2e4336a0e1ca7eeb173403df78056164
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8e1f970f9040294cfd9100c681c32af6c2aeec0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf3e39df3a397fd82967a31d17c4e02c7feab221
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7ffbdc076675c84128d5b904e4d5167fe9f3a7f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-ft260.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2b907001e8a83cdb71e899fd3d77ab51e2c03f10",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "90e9298f2e4336a0e1ca7eeb173403df78056164",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "460514d46e8892189fc933a1b4433811cfa5c309",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "5aa5a1b7cc4b4bec5497ad9ef113fdfe37b232f3",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "a8e1f970f9040294cfd9100c681c32af6c2aeec0",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "d7ffbdc076675c84128d5b904e4d5167fe9f3a7f",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "77832d8f1c81d9f84b6b54807fb278586001d754",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            },
            {
              "lessThan": "bf3e39df3a397fd82967a31d17c4e02c7feab221",
              "status": "affected",
              "version": "6a82582d9fa438045191074856f47165334f2777",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-ft260.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: ft260: fix stack-use-after-return write in I2C read race\n\nft260_i2c_read() points dev-\u003eread_buf at a caller-supplied buffer\n(often an on-stack variable), arms a completion and waits up to five\nseconds for the device to return the data. The HID input callback\nft260_raw_event() runs in the input/IRQ path, independent of the\ndev-\u003elock mutex held by the read path, and copies the device-supplied\npayload into dev-\u003eread_buf after a plain NULL check.\n\nThese two paths share read_buf, read_idx and read_len with no\nserialization. If the device delays its response until the read\ntimes out, ft260_i2c_read() resets the controller, clears read_buf\nand returns, unwinding the stack frame the buffer lived in. A\nresponse that arrives at that moment lets ft260_raw_event() pass the\nNULL check and then memcpy() the device-controlled payload into the\nnow-freed stack location, a bounded but attacker-influenced\nstack-use-after-return write triggerable by malicious or\nmalfunctioning hardware.\n\nAdd a dedicated spinlock that serializes every access to read_buf,\nread_idx and read_len. ft260_raw_event() now holds it across the\nNULL check, the memcpy and the index update, while the read path\ntakes it when arming and when clearing the buffer, so the teardown\ncan no longer slip between the check and the copy."
    }
  ],
  "id": "CVE-2026-80768",
  "lastModified": "2026-09-04T16:18:02.227",
  "metrics": {},
  "published": "2026-09-04T16:18:02.227",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b907001e8a83cdb71e899fd3d77ab51e2c03f10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/460514d46e8892189fc933a1b4433811cfa5c309"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5aa5a1b7cc4b4bec5497ad9ef113fdfe37b232f3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77832d8f1c81d9f84b6b54807fb278586001d754"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/90e9298f2e4336a0e1ca7eeb173403df78056164"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a8e1f970f9040294cfd9100c681c32af6c2aeec0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bf3e39df3a397fd82967a31d17c4e02c7feab221"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d7ffbdc076675c84128d5b904e4d5167fe9f3a7f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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