FKIE_CVE-2025-68797

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-06-17 09:59
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: char: applicom: fix NULL pointer dereference in ac_ioctl Discovered by Atuin - Automated Vulnerability Discovery Engine. In ac_ioctl, the validation of IndexCard and the check for a valid RamIO pointer are skipped when cmd is 6. However, the function unconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the end. If cmd is 6, IndexCard may reference a board that does not exist (where RamIO is NULL), leading to a NULL pointer dereference. Fix this by skipping the readb access when cmd is 6, as this command is a global information query and does not target a specific board context.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b8b353e09888bccee405e0dd6feafb60360f478
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a6240804fb7bbd4f5f6e706955248a6f4c1abbc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74883565c621eec6cd2e35fe6d27454cf2810c23
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82d12088c297fa1cef670e1718b3d24f414c23f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1b0452280029d05a98c75631131ee61c0b0d084
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d285517429a75423789e6408653e57b6fdfc8e54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f83e3e9f89181b42f6076a115d767a7552c4a39e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/applicom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5a6240804fb7bbd4f5f6e706955248a6f4c1abbc",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "d1b0452280029d05a98c75631131ee61c0b0d084",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "0b8b353e09888bccee405e0dd6feafb60360f478",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "d285517429a75423789e6408653e57b6fdfc8e54",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "74883565c621eec6cd2e35fe6d27454cf2810c23",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "f83e3e9f89181b42f6076a115d767a7552c4a39e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "82d12088c297fa1cef670e1718b3d24f414c23f7",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/applicom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "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\nchar: applicom: fix NULL pointer dereference in ac_ioctl\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nIn ac_ioctl, the validation of IndexCard and the check for a valid\nRamIO pointer are skipped when cmd is 6. However, the function\nunconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the\nend.\n\nIf cmd is 6, IndexCard may reference a board that does not exist\n(where RamIO is NULL), leading to a NULL pointer dereference.\n\nFix this by skipping the readb access when cmd is 6, as this\ncommand is a global information query and does not target a specific\nboard context."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nchar: applicom: correcci\u00f3n de desreferencia de puntero NULL en ac_ioctl\n\nDescubierta por Atuin - Motor Automatizado de Descubrimiento de Vulnerabilidades.\n\nEn ac_ioctl, la validaci\u00f3n de IndexCard y la comprobaci\u00f3n de un puntero RamIO v\u00e1lido se omiten cuando cmd es 6. Sin embargo, la funci\u00f3n ejecuta incondicionalmente readb(apbs[IndexCard].RamIO + VERS) al final.\n\nSi cmd es 6, IndexCard puede hacer referencia a una placa que no existe (donde RamIO es NULL), lo que lleva a una desreferencia de puntero NULL.\n\nEsto se soluciona omitiendo el acceso a readb cuando cmd es 6, ya que este comando es una consulta de informaci\u00f3n global y no se dirige a un contexto de placa espec\u00edfico."
    }
  ],
  "id": "CVE-2025-68797",
  "lastModified": "2026-06-17T09:59:36.270",
  "metrics": {},
  "published": "2026-01-13T16:16:01.660",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b8b353e09888bccee405e0dd6feafb60360f478"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5a6240804fb7bbd4f5f6e706955248a6f4c1abbc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/74883565c621eec6cd2e35fe6d27454cf2810c23"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82d12088c297fa1cef670e1718b3d24f414c23f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d1b0452280029d05a98c75631131ee61c0b0d084"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d285517429a75423789e6408653e57b6fdfc8e54"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f83e3e9f89181b42f6076a115d767a7552c4a39e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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