FKIE_CVE-2026-68434

Vulnerability from fkie_nvd - Published: 2026-08-12 00:17 - Updated: 2026-08-23 13:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected platforms") replaced the dnv_board setup and exit callbacks with PTR_IF(false, ...), which evaluates to NULL. However, the three call sites in mid8250_probe() and mid8250_remove() unconditionally dereference these function pointers without NULL checks, causing a NULL pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon D (ICX-D/CDF), or Snowridge (SNR) platform. Fix this by adding the missing NULL checks before calling the setup and exit callbacks.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_mid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bdaa8871b53fe9b1730ef64dda2fcd662fd83339",
              "status": "affected",
              "version": "763d61ded752fbb3116efc951eff4363f237b7e0",
              "versionType": "git"
            },
            {
              "lessThan": "f85a42fb90399dedcf81c146d09c07e4548b1e8c",
              "status": "affected",
              "version": "c7d190bb07bf4e3b217c69370e94d1b4c80a40ad",
              "versionType": "git"
            },
            {
              "lessThan": "4ea933a36a14bec19b71025cdd8407bafbd67ec1",
              "status": "affected",
              "version": "0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c",
              "versionType": "git"
            },
            {
              "lessThan": "1096397c31f6bffa95e77bdd18fbca085be83e10",
              "status": "affected",
              "version": "587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6",
              "versionType": "git"
            },
            {
              "lessThan": "600dcd548fb2b00a69f447684f52ba45d5a3540e",
              "status": "affected",
              "version": "977855894bca4b87afa50d21e3f3e85a5a0e901f",
              "versionType": "git"
            },
            {
              "lessThan": "b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56",
              "status": "affected",
              "version": "1cd54e217c6e2cdb794a897b2f855e13ffcee586",
              "versionType": "git"
            },
            {
              "lessThan": "8cbad52ccfa6a7f089cfab34979bc6cc3bff25be",
              "status": "affected",
              "version": "9690e8a342632344984af72bc56b7a1fba61e6cb",
              "versionType": "git"
            },
            {
              "lessThan": "7fb13fd7e9a59a37cd911efff83abe19e3ee029d",
              "status": "affected",
              "version": "b1b4efea05a56c0995e4702a86d6624b4fdff32f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_mid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5.10.266",
              "status": "affected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.217",
              "status": "affected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.183",
              "status": "affected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.148",
              "status": "affected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.101",
              "status": "affected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.42",
              "status": "affected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThan": "7.1.6",
              "status": "affected",
              "version": "7.1.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms\n\nCommit b1b4efea05a5 (\"serial: 8250_mid: Disable DMA for selected\nplatforms\") replaced the dnv_board setup and exit callbacks with\nPTR_IF(false, ...), which evaluates to NULL. However, the three call\nsites in mid8250_probe() and mid8250_remove() unconditionally\ndereference these function pointers without NULL checks, causing a NULL\npointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon\nD (ICX-D/CDF), or Snowridge (SNR) platform.\n\nFix this by adding the missing NULL checks before calling the setup and\nexit callbacks."
    }
  ],
  "id": "CVE-2026-68434",
  "lastModified": "2026-08-23T13:16:36.980",
  "metrics": {},
  "published": "2026-08-12T00:17:43.520",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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