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Test your applicationsThere is no fixed version for RHEL:6
kernel-kdump
.
Note: Versions mentioned in the description apply only to the upstream kernel-kdump
package and not the kernel-kdump
package as distributed by RHEL
.
See How to fix?
for RHEL:6
relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy()
In split_large_buddy(), we might call pfn_to_page() on a PFN that might not exist. In corner cases, such as when freeing the highest pageblock in the last memory section, this could result with CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and and __section_mem_map_addr() dereferencing that NULL pointer.
Let's fix it, and avoid doing a pfn_to_page() call for the first iteration, where we already have the page.
So far this was found by code inspection, but let's just CC stable as the fix is easy.