# CVE-2025-40349: linux: In the Linux kernel, the following vulnerability has been resolved: hfs: validate record offset in hfsplus_bmap_allo... CVE-2025-40349 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2025-40349, released December 16, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-40349 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 16, 2025 ## Description In the Linux kernel, the following vulnerability has been resolved: hfs: validate record offset in hfsplus_bmap_alloc hfsplus_bmap_alloc can trigger a crash if a record offset or length is larger than node_size [ 15.264282] BUG: KASAN: slab-out-of-bounds in hfsplus_bmap_alloc+0x887/0x8b0 [ 15.265192] Read of size 8 at addr ffff8881085ca188 by task test/183 [ 15.265949] [ 15.266163] CPU: 0 UID: 0 PID: 183 Comm: test Not tainted 6.17.0-rc2-gc17b750b3ad9 #14 PREEMPT(voluntary) [ 15.266165] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 15.266167] Call Trace: [ 15.266168] [ 15.266169] dump_stack_lvl+0x53/0x70 [ 15.266173] print_report+0xd0/0x660 [ 15.266181] kasan_report+0xce/0x100 [ 15.266185] hfsplus_bmap_alloc+0x887/0x8b0 [ 15.266208] hfs_btree_inc_height.isra.0+0xd5/0x7c0 [ 15.266217] hfsplus_brec_insert+0x870/0xb00 [ 15.266222] __hfsplus_ext_write_extent+0x428/0x570 [ 15.266225] __hfsplus_ext_cache_extent+0x5e/0x910 [ 15.266227] hfsplus_ext_read_extent+0x1b2/0x200 [ 15.266233] hfsplus_file_extend+0x5a7/0x1000 [ 15.266237] hfsplus_get_block+0x12b/0x8c0 [ 15.266238] __block_write_begin_int+0x36b/0x12c0 [ 15.266251] block_write_begin+0x77/0x110 [ 15.266252] cont_write_begin+0x428/0x720 [ 15.266259] hfsplus_write_begin+0x51/0x100 [ 15.266262] cont_write_begin+0x272/0x720 [ 15.266270] hfsplus_write_begin+0x51/0x100 [ 15.266274] generic_perform_write+0x321/0x750 [ 15.266285] generic_file_write_iter+0xc3/0x310 [ 15.266289] __kernel_write_iter+0x2fd/0x800 [ 15.266296] dump_user_range+0x2ea/0x910 [ 15.266301] elf_core_dump+0x2a94/0x2ed0 [ 15.266320] vfs_coredump+0x1d85/0x45e0 [ 15.266349] get_signal+0x12e3/0x1990 [ 15.266357] arch_do_signal_or_restart+0x89/0x580 [ 15.266362] irqentry_exit_to_user_mode+0xab/0x110 [ 15.266364] asm_exc_page_fault+0x26/0x30 [ 15.266366] RIP: 0033:0x41bd35 [ 15.266367] Code: bc d1 f3 0f 7f 27 f3 0f 7f 6f 10 f3 0f 7f 77 20 f3 0f 7f 7f 30 49 83 c0 0f 49 29 d0 48 8d 7c 17 31 e9 9f 0b 00 00 66 0f ef c0 0f 6f 0e f3 0f 6f 56 10 66 0f 74 c1 66 0f d7 d0 49 83 f8f [ 15.266369] RSP: 002b:00007ffc9e62d078 EFLAGS: 00010283 [ 15.266371] RAX: 00007ffc9e62d100 RBX: 0000000000000000 RCX: 0000000000000000 [ 15.266372] RDX: 00000000000000e0 RSI: 0000000000000000 RDI: 00007ffc9e62d100 [ 15.266373] RBP: 0000400000000040 R08: 00000000000000e0 R09: 0000000000000000 [ 15.266374] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 15.266375] R13: 0000000000000000 R14: 0000000000000000 R15: 0000400000000000 [ 15.266376] When calling hfsplus_bmap_alloc to allocate a free node, this function first retrieves the bitmap from header node and map node using node->page together with the offset and length from hfs_brec_lenoff ``` len = hfs_brec_lenoff(node, 2, &off16); off = off16; off += node->page_offset; pagep = node->page + (off >> PAGE_SHIFT); data = kmap_local_page(*pagep); ``` However, if the retrieved offset or length is invalid(i.e. exceeds node_size), the code may end up accessing pages outside the allocated range for this node. This patch adds proper validation of both offset and length before use, preventing out-of-bounds page access. Move is_bnode_offset_valid and check_and_correct_requested_length to hfsplus_fs.h, as they may be required by other functions. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.20.24.1 | [SUSE-SU-2026:0281-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0281-1.md) | Jan 23, 2026 | | Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-default sles 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.84.1.150600.12.38.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.84.1.150600.12.38.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.28.1.150700.17.19.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-livepatch-SLE15-SP6_Update_19 sles 15.6 | 1-150600.13.3.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-livepatch-SLE15-SP7-RT_Update_8 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2026:0278-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0278-1.md) | Jan 23, 2026 | | Linux | kernel-livepatch-SLE15-SP7_Update_8 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-source sles 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-source-azure sles 15.7 | 6.4.0-150700.20.24.1 | [SUSE-SU-2026:0281-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0281-1.md) | Jan 23, 2026 | | Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | kernel-syms-azure sles 15.7 | 6.4.0-150700.20.24.1 | [SUSE-SU-2026:0281-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0281-1.md) | Jan 23, 2026 | | Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.84.1 | [SUSE-SU-2026:0293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0293-1.md) | Jan 26, 2026 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.28.1 | [SUSE-SU-2026:0315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0315-1.md) | Jan 28, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.158-1 | [DEBIAN-CVE-2025-40349](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40349.md) | Dec 16, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-40349](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40349.md) | Dec 16, 2025 | | Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40349](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40349.md) | Dec 16, 2025 | --- Data as of 2026-11-08T13:06:02Z UTC. 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