# CVE-2025-40088: hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp() CVE-2025-40088 is fixed in 24 products on 1 platform, first by DEBIAN-CVE-2025-40088, released October 30, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-40088 - Priority: High - CVSS: 7.1 (Moderate) - EPSS: 0.0015 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 30, 2025 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40088 ## Description In the Linux kernel, the following vulnerability has been resolved: hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp() The hfsplus_strcasecmp() logic can trigger the issue: [ 117.317703][ T9855] ================================================================== [ 117.318353][ T9855] BUG: KASAN: slab-out-of-bounds in hfsplus_strcasecmp+0x1bc/0x490 [ 117.318991][ T9855] Read of size 2 at addr ffff88802160f40c by task repro/9855 [ 117.319577][ T9855] [ 117.319773][ T9855] CPU: 0 UID: 0 PID: 9855 Comm: repro Not tainted 6.17.0-rc6 #33 PREEMPT(full) [ 117.319780][ T9855] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 117.319783][ T9855] Call Trace: [ 117.319785][ T9855] [ 117.319788][ T9855] dump_stack_lvl+0x1c1/0x2a0 [ 117.319795][ T9855] ? __virt_addr_valid+0x1c8/0x5c0 [ 117.319803][ T9855] ? __pfx_dump_stack_lvl+0x10/0x10 [ 117.319808][ T9855] ? rcu_is_watching+0x15/0xb0 [ 117.319816][ T9855] ? lock_release+0x4b/0x3e0 [ 117.319821][ T9855] ? __kasan_check_byte+0x12/0x40 [ 117.319828][ T9855] ? __virt_addr_valid+0x1c8/0x5c0 [ 117.319835][ T9855] ? __virt_addr_valid+0x4a5/0x5c0 [ 117.319842][ T9855] print_report+0x17e/0x7e0 [ 117.319848][ T9855] ? __virt_addr_valid+0x1c8/0x5c0 [ 117.319855][ T9855] ? __virt_addr_valid+0x4a5/0x5c0 [ 117.319862][ T9855] ? __phys_addr+0xd3/0x180 [ 117.319869][ T9855] ? hfsplus_strcasecmp+0x1bc/0x490 [ 117.319876][ T9855] kasan_report+0x147/0x180 [ 117.319882][ T9855] ? hfsplus_strcasecmp+0x1bc/0x490 [ 117.319891][ T9855] hfsplus_strcasecmp+0x1bc/0x490 [ 117.319900][ T9855] ? __pfx_hfsplus_cat_case_cmp_key+0x10/0x10 [ 117.319906][ T9855] hfs_find_rec_by_key+0xa9/0x1e0 [ 117.319913][ T9855] __hfsplus_brec_find+0x18e/0x470 [ 117.319920][ T9855] ? __pfx_hfsplus_bnode_find+0x10/0x10 [ 117.319926][ T9855] ? __pfx_hfs_find_rec_by_key+0x10/0x10 [ 117.319933][ T9855] ? __pfx___hfsplus_brec_find+0x10/0x10 [ 117.319942][ T9855] hfsplus_brec_find+0x28f/0x510 [ 117.319949][ T9855] ? __pfx_hfs_find_rec_by_key+0x10/0x10 [ 117.319956][ T9855] ? __pfx_hfsplus_brec_find+0x10/0x10 [ 117.319963][ T9855] ? __kmalloc_noprof+0x2a9/0x510 [ 117.319969][ T9855] ? hfsplus_find_init+0x8c/0x1d0 [ 117.319976][ T9855] hfsplus_brec_read+0x2b/0x120 [ 117.319983][ T9855] hfsplus_lookup+0x2aa/0x890 [ 117.319990][ T9855] ? __pfx_hfsplus_lookup+0x10/0x10 [ 117.320003][ T9855] ? d_alloc_parallel+0x2f0/0x15e0 [ 117.320008][ T9855] ? __lock_acquire+0xaec/0xd80 [ 117.320013][ T9855] ? __pfx_d_alloc_parallel+0x10/0x10 [ 117.320019][ T9855] ? __raw_spin_lock_init+0x45/0x100 [ 117.320026][ T9855] ? __init_waitqueue_head+0xa9/0x150 [ 117.320034][ T9855] __lookup_slow+0x297/0x3d0 [ 117.320039][ T9855] ? __pfx___lookup_slow+0x10/0x10 [ 117.320045][ T9855] ? down_read+0x1ad/0x2e0 [ 117.320055][ T9855] lookup_slow+0x53/0x70 [ 117.320065][ T9855] walk_component+0x2f0/0x430 [ 117.320073][ T9855] path_lookupat+0x169/0x440 [ 117.320081][ T9855] filename_lookup+0x212/0x590 [ 117.320089][ T9855] ? __pfx_filename_lookup+0x10/0x10 [ 117.320098][ T9855] ? strncpy_from_user+0x150/0x290 [ 117.320105][ T9855] ? getname_flags+0x1e5/0x540 [ 117.320112][ T9855] user_path_at+0x3a/0x60 [ 117.320117][ T9855] __x64_sys_umount+0xee/0x160 [ 117.320123][ T9855] ? __pfx___x64_sys_umount+0x10/0x10 [ 117.320129][ T9855] ? do_syscall_64+0xb7/0x3a0 [ 117.320135][ T9855] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 117.320141][ T9855] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 117.320145][ T9855] do_syscall_64+0xf3/0x3a0 [ 117.320150][ T9855] ? exc_page_fault+0x9f/0xf0 [ 117.320154][ T9855] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 117.320158][ T9855] RIP: 0033:0x7f7dd7908b07 [ 117.320163][ T9855] Code: 23 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 08 [ 117.320167][ T9855] RSP: 002b:00007ffd5ebd9698 EFLAGS: 00000202 ---truncated--- ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 | | Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-default sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.78.1.150600.12.34.2 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.78.1.150600.12.34.2 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.22.1.150700.17.15.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-livepatch-SLE15-SP6-RT_Update_17 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2025:4301-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4301-1.md) | Nov 28, 2025 | | Linux | kernel-livepatch-SLE15-SP6_Update_17 sles 15.6 | 1-150600.13.5.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-livepatch-SLE15-SP7-RT_Update_6 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2025:4141-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4141-1.md) | Nov 19, 2025 | | Linux | kernel-livepatch-SLE15-SP7_Update_6 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.58.1 | [SUSE-SU-2025:4301-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4301-1.md) | Nov 28, 2025 | | Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.58.1 | [SUSE-SU-2025:4301-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4301-1.md) | Nov 28, 2025 | | Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-source sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-source-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 | | Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.58.1 | [SUSE-SU-2025:4301-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4301-1.md) | Nov 28, 2025 | | Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.55.1 | [SUSE-SU-2025:4128-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4128-1.md) | Nov 18, 2025 | | Linux | kernel-syms-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 | | Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.58.1 | [SUSE-SU-2025:4301-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4301-1.md) | Nov 28, 2025 | | Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.78.1 | [SUSE-SU-2025:4140-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4140-1.md) | Nov 19, 2025 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 | | Linux | linux Debian 12.15 (bookworm) | 6.1.158-1 | [DEBIAN-CVE-2025-40088](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40088.md) | Oct 30, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-40088](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40088.md) | Oct 30, 2025 | | Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40088](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40088.md) | Oct 30, 2025 | --- Data as of 2026-11-09T01:18:40Z UTC. 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