DEBIAN-CVE-2026-72339

In the Linux kernel, the following vulnerability has been resolved:  qede: fix off-by-one in BD ring consumption on buildskb failure  qederxbuildskb() and qedetparxbuildskb() do not check for a NULL return from qedebuildskb(). When it returns NULL under memory pressure, the functions still consume a BD from the ring before returning NULL. The callers then recycle additional BDs, resulting in one extra BD being consumed (off-by-one). This desynchronizes the BD ring, which can corrupt DMA page reference counts and lead to SLUB freelist corruption.  Commit 4e910dbe3650 ("qede: confirm skb is allocated before using") added a NULL check inside qedebuildskb() to prevent a NULL pointer dereference, but did not address the missing NULL checks in the callers, making this off-by-one reachable.  Fix this by adding NULL checks for the return value of qedebuildskb() in both qederxbuildskb() and qedetparxbuild_skb(), returning NULL immediately before any BD ring manipulation.