# CVE-2026-53342: linux: In the Linux kernel, the following vulnerability has been resolved: arm64: mm: call pagetable dtor when freeing hot-... CVE-2026-53342 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-53342, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-53342 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 1, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: arm64: mm: call pagetable dtor when freeing hot-removed page tables Since 5e8eb9aeeda3 ("arm64: mm: always call PTE/PMD ctor in __create_pgd_mapping()") page-table allocation on ARM64 always calls pagetable_{pte,pmd,pud,p4d}_ctor(). This sets the page_type to PGTY_table, increments NR_PAGETABLE and possible allocates a PTL. However the matching pagetable_dtor() calls were never added. With DEBUG_VM enabled on kernel versions prior to v6.17 without 2dfcd1608f3a9 ("mm/page_alloc: let page freeing clear any set page type") this leads to the following warning when freeing these pages due to page->page_type sharing page->_mapcount: BUG: Bad page state in process ... pfn:284fbb page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x284fbb flags: 0x17fffc000000000(node=0|zone=2|lastcpupid=0x1ffff) page_type: f2(table) page dumped because: nonzero mapcount Call trace: bad_page+0x13c/0x160 __free_frozen_pages+0x6cc/0x860 ___free_pages+0xf4/0x180 free_pages+0x54/0x80 free_hotplug_page_range.part.0+0x58/0x90 free_empty_tables+0x438/0x500 __remove_pgd_mapping.constprop.0+0x60/0xa8 arch_remove_memory+0x48/0x80 try_remove_memory+0x158/0x1d8 offline_and_remove_memory+0x138/0x180 It can also lead to leaking the ptl allocation if ALLOC_SPLIT_PTLOCKS is defined and incorrect NR_PAGETABLE stats. Fix this by calling pagetable_dtor() in free_hotplug_pgtable_page() prior to freeing the page to undo the effects of calling pagetable_*_ctor(). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel-livepatch-6.18.36-69.134 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53342](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53342.md) | Jul 2, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.36-69.134.amzn2023 | [ALAS2023-2026-1925](https://patchblox.com/security/data/fix/linux/alas2023-2026-1925.md) | Jul 6, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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