In the Linux kernel, the following vulnerability has been resolved:
dax/kmem: account for partial discontiguous resource upon removal
When dev_dax_kmem_probe() partially succeeds (at least one range is mapped) but a subsequent range fails request_mem_region() or add_memory_driver_managed(), the probe silently continues, ultimately returning success, but with the corresponding range resource NULL'ed out.
dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if the underlying resource exists. When remove_memory() is called later, it returns 0 because the memory was never added which causes dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can be removed and attempts cleanup on a NULL pointer.
Fix this by skipping these ranges altogether, noting that these cases are considered success, such that the cleanup is still reached when all actually-added ranges are successfully removed.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-modules-extraUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python3-perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade python3-perfUpgrade kernel-modules-extra-commonUpgrade kernelUpgrade kernel-livepatch-6.1.180-225.360Upgrade kernel-tools-develUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-headers | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 16, 2026 | Aug 16, 2026 |
| Redhat_linux | — | No solution exists | Aug 24, 2026 | Aug 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 21, 2026 | Aug 15, 2026 |
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