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A vulnerability in the Linux kernel's PowerPC architecture related to improper handling of page table fragments has been resolved. The issue involves incorrect page state management in the pte_frag_destroy function, which could lead to memory corruption. This flaw is part of a broader set of security issues fixed in the Linux kernel affecting multiple architectures and subsystems. The vulnerability has a CVSS score of 7.8, indicating a high impact on confidentiality, integrity, and availability. A patch is available and included in updated Linux kernel packages. Users should update and reboot their systems to apply the fix. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No known exploits are reported in the wild.

CVE-2026-53109 addresses a flaw in the Linux kernel's PowerPC page table fragment management. The kernel uses pt_frag_refcount to track references to page table fragments. In configurations with 64K page size and hash tables, multiple 4K fragments exist per 64K page. The patch fixes improper handling of the active flag and reference counting in pte_free_defer and pte_fragment_free functions, which could otherwise lead to a bad page state and potential memory corruption. This vulnerability is part of a larger set of kernel security fixes covering various architectures and subsystems. The issue has been resolved in Linux kernel versions 7.0.0 and later, with specific patched package versions provided by Ubuntu. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability.

Detailed information about UBUNTU-CVE-2026-53109 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-53109 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: powerpc/pgtable-frag: Fix bad page state in pte_frag_destroy powerpc uses… (CVE-2026-53109)

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