# CVE-2026-72196: linux: In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound copy_lcns dp->page_lcns[] index... CVE-2026-72196 is fixed in 56 products on 1 platform, first by DEBIAN-CVE-2026-72196, released August 15, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-72196 - Priority: High - CVSS: 8.4 (high) - EPSS: 0.0019 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 15, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <20260502154252.164586-1-jhapavitra98@gmail.com>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes, fixed conflicts] ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | bpftool6.12 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | bpftool6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-devel amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-headers amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-livepatch-6.1.180-225.360 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-livepatch-6.12.100-125.179 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel-livepatch-6.18.41-94.142 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-tools amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | kernel6.12 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.180-1 | [DEBIAN-CVE-2026-72196](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72196.md) | Aug 15, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.100-1 | [DEBIAN-CVE-2026-72196](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72196.md) | Aug 15, 2026 | | Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-72196](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72196.md) | Aug 15, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | perf amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | perf6.12 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | python3-perf amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.180-225.360.amzn2023 | [ALAS2023-2026-2058](https://patchblox.com/security/data/fix/linux/alas2023-2026-2058.md) | Aug 17, 2026 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.100-125.179.amzn2023 | [ALAS2023-2026-2057](https://patchblox.com/security/data/fix/linux/alas2023-2026-2057.md) | Aug 17, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.41-94.142.amzn2023 | [ALAS2023-2026-2071](https://patchblox.com/security/data/fix/linux/alas2023-2026-2071.md) | Aug 31, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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