DEBIAN-CVE-2026-80671

In the Linux kernel, the following vulnerability has been resolved:  perf sched: Fix registerpid() overflow, strcpy, and BUGON  registerpid() has several issues when processing untrusted perf.data:  1. Integer overflow: (pid + 1) * sizeof(struct taskdesc *) can wrap    to a small value on 32-bit systems when pid is large (e.g.    0x40000000), causing realloc to return a tiny buffer followed by    out-of-bounds writes in the initialization loop.  2. Heap buffer overflow: strcpy(task->comm, comm) copies the    untrusted comm string into a fixed 20-byte COMMLEN buffer with    no length check.  3. BUGON on allocation failure: perf.data is untrusted input, so    allocation failures should be handled gracefully rather than    killing the process.  4. Realloc of sched->tasks assigned directly back, leaking the old    pointer on failure; nrtasks incremented before the realloc,    leaving corrupted state on failure.  Cap pid at PIDMAXLIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUGON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.