CVE-2026-43306

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: crypto: Use the correct destructor kfunc type

With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. I ran into the following type mismatch when running BPF self-tests:

CFI failure at bpf_obj_free_fields+0x190/0x238 (target: bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc) Internal error: Oops - CFI: 00000000f2008228 [#1] SMP …

As bpf_crypto_ctx_release() is also used in BPF programs and using a void pointer as the argument would make the verifier unhappy, add a simple stub function with the correct type and register it as the destructor kfunc instead.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3e1c6f35409f9e447bf37f64840f5b65576bfb78 < 4e3e57dbf46dad3498f8c4219ce2dba756875962affected
LinuxLinux3e1c6f35409f9e447bf37f64840f5b65576bfb78 < 50d6fd69388cc7b05dce72f09080674dcede4ac9affected
LinuxLinux3e1c6f35409f9e447bf37f64840f5b65576bfb78 < 3979a550fe06b370d73647f59cf462fa525c9ec4affected
LinuxLinux3e1c6f35409f9e447bf37f64840f5b65576bfb78 < b40a5d724f29fc2eed23ff353808a9aae616b48aaffected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.16 <= 6.18.*unaffected
LinuxLinux6.19.6 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References