CVE-2026-53334

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mm/damon/reclaim: handle ctx allocation failure<br /> <br /> Patch series "mm/damon/{reclaim,lru_sort}: handle ctx allocation failures".<br /> <br /> DAMON_RECLAIM and DAMON_LRU_SORT could dereference NULL pointers if their<br /> damon_ctx object allocations fail. The bugs are expected to happen<br /> infrequently because the allocations are arguably too small to fail on<br /> common setups. But theoretically they are possible and the consequences<br /> are bad. Fix those.<br /> <br /> The issues were discovered [1] by Sashiko.<br /> <br /> <br /> This patch (of 2):<br /> <br /> DAMON_RECLAIM allocates the damon_ctx object for its kdamond in its init<br /> function. damon_reclaim_enabled_store() wrongly assumes the allocation<br /> will always succeed once tried. If the damon_ctx allocation was failed,<br /> therefore, code execution reaches to damon_commit_ctx() while &amp;#39;ctx&amp;#39; is<br /> NULL. As a result, it dereferences the NULL &amp;#39;ctx&amp;#39; pointer. Avoid the<br /> NULL dereference by returning -ENOMEM if &amp;#39;ctx&amp;#39; is NULL.