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

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-01-13 15:29
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
Linux Linux 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 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-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/char/applicom.c"
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      "cpeApplicability": [
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              "operator": "OR"
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-13T15:29:07.575Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "char: applicom: fix NULL pointer dereference in ac_ioctl",
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    "cveId": "CVE-2025-68797",
    "datePublished": "2026-01-13T15:29:07.575Z",
    "dateReserved": "2025-12-24T10:30:51.042Z",
    "dateUpdated": "2026-01-13T15:29:07.575Z",
    "state": "PUBLISHED"
  },
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  }
}


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  • 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.
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  • 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.



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