# CVE-2024-56548: linux: In the Linux kernel, the following vulnerability has been resolved:  hfsplus: don't query the device logical block si...

CVE-2024-56548 is fixed in 43 products on 1 platform, first by DEBIAN-CVE-2024-56548, released December 27, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-56548
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 27, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  hfsplus: don't query the device logical block size multiple times  Devices block sizes may change. One of these cases is a loop device by using ioctl LOOP_SET_BLOCK_SIZE.  While this may cause other issues like IO being rejected, in the case of hfsplus, it will allocate a block by using that size and potentially write out-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the latter function reads a different io_size.  Using a new min_io_size initally set to sb_min_blocksize works for the purposes of the original fix, since it will be set to the max between HFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the max between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not initialized.  Tested by mounting an hfsplus filesystem with loop block sizes 512, 1024 and 4096.  The produced KASAN report before the fix looks like this:  [  419.944641] ================================================================== [  419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a [  419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678 [  419.947612] [  419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84 [  419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [  419.950035] Call Trace: [  419.950384]  <TASK> [  419.950676]  dump_stack_lvl+0x57/0x78 [  419.951212]  ? hfsplus_read_wrapper+0x659/0xa0a [  419.951830]  print_report+0x14c/0x49e [  419.952361]  ? __virt_addr_valid+0x267/0x278 [  419.952979]  ? kmem_cache_debug_flags+0xc/0x1d [  419.953561]  ? hfsplus_read_wrapper+0x659/0xa0a [  419.954231]  kasan_report+0x89/0xb0 [  419.954748]  ? hfsplus_read_wrapper+0x659/0xa0a [  419.955367]  hfsplus_read_wrapper+0x659/0xa0a [  419.955948]  ? __pfx_hfsplus_read_wrapper+0x10/0x10 [  419.956618]  ? do_raw_spin_unlock+0x59/0x1a9 [  419.957214]  ? _raw_spin_unlock+0x1a/0x2e [  419.957772]  hfsplus_fill_super+0x348/0x1590 [  419.958355]  ? hlock_class+0x4c/0x109 [  419.958867]  ? __pfx_hfsplus_fill_super+0x10/0x10 [  419.959499]  ? __pfx_string+0x10/0x10 [  419.960006]  ? lock_acquire+0x3e2/0x454 [  419.960532]  ? bdev_name.constprop.0+0xce/0x243 [  419.961129]  ? __pfx_bdev_name.constprop.0+0x10/0x10 [  419.961799]  ? pointer+0x3f0/0x62f [  419.962277]  ? __pfx_pointer+0x10/0x10 [  419.962761]  ? vsnprintf+0x6c4/0xfba [  419.963178]  ? __pfx_vsnprintf+0x10/0x10 [  419.963621]  ? setup_bdev_super+0x376/0x3b3 [  419.964029]  ? snprintf+0x9d/0xd2 [  419.964344]  ? __pfx_snprintf+0x10/0x10 [  419.964675]  ? lock_acquired+0x45c/0x5e9 [  419.965016]  ? set_blocksize+0x139/0x1c1 [  419.965381]  ? sb_set_blocksize+0x6d/0xae [  419.965742]  ? __pfx_hfsplus_fill_super+0x10/0x10 [  419.966179]  mount_bdev+0x12f/0x1bf [  419.966512]  ? __pfx_mount_bdev+0x10/0x10 [  419.966886]  ? vfs_parse_fs_string+0xce/0x111 [  419.967293]  ? __pfx_vfs_parse_fs_string+0x10/0x10 [  419.967702]  ? __pfx_hfsplus_mount+0x10/0x10 [  419.968073]  legacy_get_tree+0x104/0x178 [  419.968414]  vfs_get_tree+0x86/0x296 [  419.968751]  path_mount+0xba3/0xd0b [  419.969157]  ? __pfx_path_mount+0x10/0x10 [  419.969594]  ? kmem_cache_free+0x1e2/0x260 [  419.970311]  do_mount+0x99/0xe0 [  419.970630]  ? __pfx_do_mount+0x10/0x10 [  419.971008]  __do_sys_mount+0x199/0x1c9 [  419.971397]  do_syscall_64+0xd0/0x135 [  419.971761]  entry_SYSCALL_64_after_hwframe+0x76/0x7e [  419.972233] RIP: 0033:0x7c3cb812972e [  419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48 [  419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 [  419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e [  419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI: ---truncated---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | bpftool ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-coco sles 15.6 | 6.4.0-15061.18.coco15sp6.1 | [SUSE-SU-2025:0784-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0784-1.md) | Mar 5, 2025 |
| Linux | kernel-coco_debug sles 15.6 | 6.4.0-15061.18.coco15sp6.1 | [SUSE-SU-2025:0784-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0784-1.md) | Mar 5, 2025 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.42.2.150600.12.18.4 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.42.2.150600.12.18.4 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_8 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2025:0557-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0557-1.md) | Feb 14, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_9 sles 15.6 | 1-150600.1.3.2 | [SUSE-SU-2025:0955-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0955-1.md) | Mar 19, 2025 |
| Linux | kernel-livepatch-SLE15-SP6_Update_8 sles 15.6 | 1-150600.13.3.2 | [SUSE-SU-2025:0499-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0499-1.md) | Feb 13, 2025 |
| Linux | kernel-livepatch-SLE15-SP6_Update_9 sles 15.6 | 1-150600.13.3.4 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.29.1 | [SUSE-SU-2025:0955-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0955-1.md) | Mar 19, 2025 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.29.1 | [SUSE-SU-2025:0955-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0955-1.md) | Mar 19, 2025 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-source-coco sles 15.6 | 6.4.0-15061.18.coco15sp6.1 | [SUSE-SU-2025:0784-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0784-1.md) | Mar 5, 2025 |
| Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.29.1 | [SUSE-SU-2025:0955-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0955-1.md) | Mar 19, 2025 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.42.1 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.31.1 | [SUSE-SU-2025:0847-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0847-1.md) | Mar 12, 2025 |
| Linux | kernel-syms-coco sles 15.6 | 6.4.0-15061.18.coco15sp6.1 | [SUSE-SU-2025:0784-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0784-1.md) | Mar 5, 2025 |
| Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.29.1 | [SUSE-SU-2025:0955-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0955-1.md) | Mar 19, 2025 |
| Linux | kernel-uek ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.340.4.1.el7uek | [ELSA-2025-20100](https://patchblox.com/security/data/fix/linux/elsa-2025-20100.md) | Feb 12, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.42.2 | [SUSE-SU-2025:0856-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-0856-1.md) | Mar 13, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.123-1 | [DEBIAN-CVE-2024-56548](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56548.md) | Dec 27, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.12.3-1 | [DEBIAN-CVE-2024-56548](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56548.md) | Dec 27, 2024 |
| Linux | linux Debian 14 | 6.12.3-1 | [DEBIAN-CVE-2024-56548](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56548.md) | Dec 27, 2024 |

---

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