Debian 11 Glibc Critical Memory Management Issues DLA-4621-1

CVE-2025-8058

posix: Fix double-free after allocation failure in regcomp

The regcomp function in the GNU C library version from 2.4 to 2.41 is
subject to a double free if some previous allocation fails. It can be
accomplished either by a malloc failure or by using an interposed
malloc that injects random malloc failures. The double free can allow
buffer manipulation depending of how the regex is constructed. This
issue affects all architectures and ABIs supported by the GNU C
library.

CVE-2025-15281

posix: Reset wordexp_t fields with WRDE_REUSE

Calling wordexp with WRDE_REUSE in conjunction with WRDE_APPEND in the
GNU C Library version 2.0 to version 2.42 may cause the interface to
return uninitialized memory in the we_wordv member, which on
subsequent calls to wordfree may abort the process.

CVE-2026-0861

memalign: reinstate alignment overflow check

Passing too large an alignment to the memalign suite of functions