{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56548", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T14:03:05.989Z", "datePublished": "2024-12-27T14:11:29.373Z", "dateUpdated": "2026-08-05T11:44:57.408Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:44:57.408Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: don't query the device logical block size multiple times\n\nDevices block sizes may change. One of these cases is a loop device by\nusing ioctl LOOP_SET_BLOCK_SIZE.\n\nWhile this may cause other issues like IO being rejected, in the case of\nhfsplus, it will allocate a block by using that size and potentially write\nout-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the\nlatter function reads a different io_size.\n\nUsing a new min_io_size initally set to sb_min_blocksize works for the\npurposes of the original fix, since it will be set to the max between\nHFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the\nmax between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not\ninitialized.\n\nTested by mounting an hfsplus filesystem with loop block sizes 512, 1024\nand 4096.\n\nThe produced KASAN report before the fix looks like this:\n\n[ 419.944641] ==================================================================\n[ 419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a\n[ 419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678\n[ 419.947612]\n[ 419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84\n[ 419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\n[ 419.950035] Call Trace:\n[ 419.950384] \n[ 419.950676] dump_stack_lvl+0x57/0x78\n[ 419.951212] ? hfsplus_read_wrapper+0x659/0xa0a\n[ 419.951830] print_report+0x14c/0x49e\n[ 419.952361] ? __virt_addr_valid+0x267/0x278\n[ 419.952979] ? kmem_cache_debug_flags+0xc/0x1d\n[ 419.953561] ? hfsplus_read_wrapper+0x659/0xa0a\n[ 419.954231] kasan_report+0x89/0xb0\n[ 419.954748] ? hfsplus_read_wrapper+0x659/0xa0a\n[ 419.955367] hfsplus_read_wrapper+0x659/0xa0a\n[ 419.955948] ? __pfx_hfsplus_read_wrapper+0x10/0x10\n[ 419.956618] ? do_raw_spin_unlock+0x59/0x1a9\n[ 419.957214] ? _raw_spin_unlock+0x1a/0x2e\n[ 419.957772] hfsplus_fill_super+0x348/0x1590\n[ 419.958355] ? hlock_class+0x4c/0x109\n[ 419.958867] ? __pfx_hfsplus_fill_super+0x10/0x10\n[ 419.959499] ? __pfx_string+0x10/0x10\n[ 419.960006] ? lock_acquire+0x3e2/0x454\n[ 419.960532] ? bdev_name.constprop.0+0xce/0x243\n[ 419.961129] ? __pfx_bdev_name.constprop.0+0x10/0x10\n[ 419.961799] ? pointer+0x3f0/0x62f\n[ 419.962277] ? __pfx_pointer+0x10/0x10\n[ 419.962761] ? vsnprintf+0x6c4/0xfba\n[ 419.963178] ? __pfx_vsnprintf+0x10/0x10\n[ 419.963621] ? setup_bdev_super+0x376/0x3b3\n[ 419.964029] ? snprintf+0x9d/0xd2\n[ 419.964344] ? __pfx_snprintf+0x10/0x10\n[ 419.964675] ? lock_acquired+0x45c/0x5e9\n[ 419.965016] ? set_blocksize+0x139/0x1c1\n[ 419.965381] ? sb_set_blocksize+0x6d/0xae\n[ 419.965742] ? __pfx_hfsplus_fill_super+0x10/0x10\n[ 419.966179] mount_bdev+0x12f/0x1bf\n[ 419.966512] ? __pfx_mount_bdev+0x10/0x10\n[ 419.966886] ? vfs_parse_fs_string+0xce/0x111\n[ 419.967293] ? __pfx_vfs_parse_fs_string+0x10/0x10\n[ 419.967702] ? __pfx_hfsplus_mount+0x10/0x10\n[ 419.968073] legacy_get_tree+0x104/0x178\n[ 419.968414] vfs_get_tree+0x86/0x296\n[ 419.968751] path_mount+0xba3/0xd0b\n[ 419.969157] ? __pfx_path_mount+0x10/0x10\n[ 419.969594] ? kmem_cache_free+0x1e2/0x260\n[ 419.970311] do_mount+0x99/0xe0\n[ 419.970630] ? __pfx_do_mount+0x10/0x10\n[ 419.971008] __do_sys_mount+0x199/0x1c9\n[ 419.971397] do_syscall_64+0xd0/0x135\n[ 419.971761] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 419.972233] RIP: 0033:0x7c3cb812972e\n[ 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\n[ 419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5\n[ 419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e\n[ 419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI:\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attack requires local access to issue the `mount()` syscall on an hfsplus image and a concurrent `LOOP_SET_BLOCK_SIZE` ioctl on the backing loop device. There is no remote or adjacent-network path into `hfsplus_read_wrapper()`.\nAC:L - Although this is a race, the attacker controls both sides — they initiate the mount and drive the block-size ioctl from another thread — and can retry indefinitely; the window spans `hfsplus_get_last_session()`, two kmallocs and full bio round-trips through the `reread:` path, making it wide and reliably winnable.\nPR:L - `LOOP_SET_BLOCK_SIZE` needs only a writable loop fd with no CAP_SYS_ADMIN check, and the mount side is reachable by a low-privileged local user on the many deployments that delegate mounting (udisks2/autofs removable-media automount on desktops, Android/ChromeOS external HFS+ media, containers granted CAP_SYS_ADMIN), matching the CNA's established scoring for hfsplus mount-path flaws.\nUI:N - The attacker performs both the loop-device setup/ioctl and the mount themselves; no action by a separate victim user is needed.\nS:U - The heap corruption occurs in kernel memory and is exploited within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `*data = (u8 *)buf + offset` is computed with the enlarged io_size, so `sbi->s_vhdr`/`s_backup_vhdr` point outside the allocation and the code reads adjacent (including freed) slab memory, and the resulting slab corruption can be leveraged into a broader kernel-memory read primitive.\nI:H - The bio is built over up to PAGE_SIZE bytes starting at a 512-byte slab object, so the block read writes thousands of bytes of attacker-chosen loop backing-file content over neighbouring kmalloc objects — a controlled slab out-of-bounds write suitable for control-flow hijacking and privilege escalation.\nA:H - The out-of-bounds access reliably corrupts adjacent slab objects and triggers a KASAN slab-use-after-free/oops as shown in the commit log, readily causing a kernel panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/hfsplus/hfsplus_fs.h", "fs/hfsplus/wrapper.c" ], "versions": [ { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "f57725bcc5816425e25218fdf5fb6923bc578cdf", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "06cbfbb13ac88f4154c2eb4bc4176f9d10139847", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "3d7bda75e1a6239db053c73acde17ca146317824", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "21900e8478126ff6afe3b66679f676e74d1f8830", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "2667c9b7b76efcbc7adbfea249892f20c313b0da", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "bfeecda050aa9376f642d5b2a71c4112cc6c8216", "status": "affected", "versionType": "git" }, { "version": "6596528e391ad978a6a120142cba97a1d7324cb6", "lessThan": "1c82587cb57687de3f18ab4b98a8850c789bedcf", "status": "affected", "versionType": "git" }, { "version": "c53c89aba3ebdfc3e9acdb18bb5ee9d2f8a328d0", "status": "affected", "versionType": "git" }, { "version": "3.0.8", "lessThan": "3.1", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/hfsplus/hfsplus_fs.h", "fs/hfsplus/wrapper.c" ], "versions": [ { "version": "3.1", "status": "affected" }, { "version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.325", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.287", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.231", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "4.19.325" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.4.287" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.10.231" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.11.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.0.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8" }, { "url": "https://git.kernel.org/stable/c/f57725bcc5816425e25218fdf5fb6923bc578cdf" }, { "url": "https://git.kernel.org/stable/c/e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866" }, { "url": "https://git.kernel.org/stable/c/06cbfbb13ac88f4154c2eb4bc4176f9d10139847" }, { "url": "https://git.kernel.org/stable/c/3d7bda75e1a6239db053c73acde17ca146317824" }, { "url": "https://git.kernel.org/stable/c/21900e8478126ff6afe3b66679f676e74d1f8830" }, { "url": "https://git.kernel.org/stable/c/2667c9b7b76efcbc7adbfea249892f20c313b0da" }, { "url": "https://git.kernel.org/stable/c/bfeecda050aa9376f642d5b2a71c4112cc6c8216" }, { "url": "https://git.kernel.org/stable/c/1c82587cb57687de3f18ab4b98a8850c789bedcf" } ], "title": "hfsplus: don't query the device logical block size multiple times", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-56548", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:02:19.622310Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:16.366Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:49:23.519Z" } } ] } }