CVE-2025-68797

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5a6240804fb7bbd4f5f6e706955248a6f4c1abbcaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d1b0452280029d05a98c75631131ee61c0b0d084affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0b8b353e09888bccee405e0dd6feafb60360f478affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d285517429a75423789e6408653e57b6fdfc8e54affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 74883565c621eec6cd2e35fe6d27454cf2810c23affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f83e3e9f89181b42f6076a115d767a7552c4a39eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 82d12088c297fa1cef670e1718b3d24f414c23f7affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.10.248 <= 5.10.*unaffected
LinuxLinux5.15.198 <= 5.15.*unaffected
LinuxLinux6.1.160 <= 6.1.*unaffected
LinuxLinux6.6.120 <= 6.6.*unaffected
LinuxLinux6.12.64 <= 6.12.*unaffected
LinuxLinux6.18.3 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References