CVE-2026-46333

In the Linux kernel, the following vulnerability has been resolved: ptrace: slightly saner 'get_dumpable()' logic The 'dumpability' of a task is fundamentally about the memory image of the task - the concept comes from whether it can core dump or not - and makes no sense when you don't have an associated mm. And almost all users do in fact use it only for the case where the task has a mm pointer. But we have one odd special case: ptrace_may_access() uses 'dumpable' to check various other things entirely independently of the MM (typically explicitly using flags like PTRACE_MODE_READ_FSCREDS). Including for threads that no longer have a VM (and maybe never did, like most kernel threads). It's not what this flag was designed for, but it is what it is. The ptrace code does check that the uid/gid matches, so you do have to be uid-0 to see kernel thread details, but this means that the traditional "drop capabilities" model doesn't make any difference for this all. Make it all make a *bit* more sense by saying that if you don't have a MM pointer, we'll use a cached "last dumpability" flag if the thread ever had a MM (it will be zero for kernel threads since it is never set), and require a proper CAP_SYS_PTRACE capability to override.

• linux linux kernel (>= 3.16.52 < 3.17) • linux linux kernel (>= 4.4.40 < 4.5) • linux linux kernel (>= 4.8.16 < 4.9) • linux linux kernel (>= 4.9.1 < 5.10.256) • linux linux kernel (>= 5.11 < 5.15.207) • linux linux kernel (>= 5.16 < 6.1.173) • linux linux kernel (>= 6.2 < 6.6.139) • linux linux kernel (>= 6.7 < 6.12.89) • linux linux kernel (>= 6.13 < 6.18.31) • linux linux kernel (>= 6.19 < 7.0.8) • linux linux kernel 7.1 • debian debian linux 11.0