fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact because of incorrect fpu_fpregs_owner_ctx caching, as demonstrated by mishandling of signal-based non-cooperative preemption in Go 1.14 prereleases on amd64, aka CID-59c4bd853abc.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98 | exploit vendor advisory |
| https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98 | third party advisory exploit |
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 | release notes vendor advisory |
| https://github.com/golang/go/issues/35777#issuecomment-561935388 | issue tracking third party advisory |
| https://bugzilla.kernel.org/show_bug.cgi?id=205663 | issue tracking third party advisory |
| https://security.netapp.com/advisory/ntap-20200103-0001/ | third party advisory |
| https://usn.ubuntu.com/4284-1/ | third party advisory vendor advisory |