Description
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.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5a6240804fb7bbd4f5f6e706955248a6f4c1abbc; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d1b0452280029d05a98c75631131ee61c0b0d084; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0b8b353e09888bccee405e0dd6feafb60360f478; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d285517429a75423789e6408653e57b6fdfc8e54; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 74883565c621eec6cd2e35fe6d27454cf2810c23; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f83e3e9f89181b42f6076a115d767a7552c4a39e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 82d12088c297fa1cef670e1718b3d24f414c23f7 |
| Linux | Linux | 2.6.12 |
References
- https://git.kernel.org/stable/c/0b8b353e09888bccee405e0dd6feafb60360f478
- https://git.kernel.org/stable/c/5a6240804fb7bbd4f5f6e706955248a6f4c1abbc
- https://git.kernel.org/stable/c/74883565c621eec6cd2e35fe6d27454cf2810c23
- https://git.kernel.org/stable/c/82d12088c297fa1cef670e1718b3d24f414c23f7
- https://git.kernel.org/stable/c/d1b0452280029d05a98c75631131ee61c0b0d084
- https://git.kernel.org/stable/c/d285517429a75423789e6408653e57b6fdfc8e54
- https://git.kernel.org/stable/c/f83e3e9f89181b42f6076a115d767a7552c4a39e
Timeline
- Published
- Jan 13, 2026
- Last modified
- Jun 17, 2026
- NVD status
- Deferred