CVE-2025-68797 (GCVE-0-2025-68797)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-05-11 21:53
VLAI
Title
char: applicom: fix NULL pointer dereference in ac_ioctl
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5a6240804fb7bbd4f5f6e706955248a6f4c1abbc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d1b0452280029d05a98c75631131ee61c0b0d084 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0b8b353e09888bccee405e0dd6feafb60360f478 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d285517429a75423789e6408653e57b6fdfc8e54 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 74883565c621eec6cd2e35fe6d27454cf2810c23 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f83e3e9f89181b42f6076a115d767a7552c4a39e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 82d12088c297fa1cef670e1718b3d24f414c23f7 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
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            "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",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:45:16+00:00",
      "cve": "CVE-2025-68797",
      "id": "CVE-2025-68797",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: char: applicom: fix NULL pointer dereference in ac_ioctl",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68797.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.