{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-39467", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-39467" ], "published": "2024-06-25T14:25:19Z", "summary": "f2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()\n\nsyzbot reports a kernel bug as below:\n\nF2FS-fs (loop0): Mounted with checkpoint version = 48b305e4\n==================================================================\nBUG: KASAN: slab-out-of-bounds in f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]\nBUG: KASAN: slab-out-of-bounds in current_nat_addr fs/f2fs/node.h:213 [inline]\nBUG: KASAN: slab-out-of-bounds in f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600\nRead of size 1 at addr ffff88807a58c76c by task syz-executor280/5076\n\nCPU: 1 PID: 5076 Comm: syz-executor280 Not tainted 6.9.0-rc5-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline]\n current_nat_addr fs/f2fs/node.h:213 [inline]\n f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600\n f2fs_xattr_fiemap fs/f2fs/data.c:1848 [inline]\n f2fs_fiemap+0x55d/0x1ee0 fs/f2fs/data.c:1925\n ioctl_fiemap fs/ioctl.c:220 [inline]\n do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:838\n __do_sys_ioctl fs/ioctl.c:902 [inline]\n __se_sys_ioctl+0x81/0x170 fs/ioctl.c:890\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is we missed to do sanity check on i_xattr_nid during\nf2fs_iget(), so that in fiemap() path, current_nat_addr() will access\nnat_bitmap w/ offset from invalid i_xattr_nid, result in triggering\nkasan bug report, fix it.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { 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"assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.94" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.94" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-39467" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c559a8d840562fbfce9f318448dda2f7d3e6d8e8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/75c87e2ac6149abf44bdde0dd6d541763ddb0dff" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8c8aa473fe6eb46a4bf99f3ea2dbe52bf0c1a1f0" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/be0155202e431f3007778568a72432c68f8946ba" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/68e3cd4ecb8603936cccdc338929130045df2e57" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/20faaf30e55522bba2b56d9c46689233205d7717" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerable code is reached only through a locally attached/mounted crafted f2fs image, with the trigger being a local `ioctl(FS_IOC_FIEMAP, FIEMAP_FLAG_XATTR)` syscall or mount-time roll-forward recovery. No network or remote-peer data path exists into fs/f2fs/inode.c or the NAT lookup code.\nAC:L - The attacker fully controls every input \u2014 the on-disk `i_xattr_nid`, the checkpoint's NAT bitmap size, and the NAT/SSA/SIT block layout \u2014 so the out-of-range `NAT_BLOCK_OFFSET(nid)` deterministically indexes past `nm_i->nat_bitmap` on the first attempt. There is no race, no dependence on uncontrollable memory layout, and no non-default kernel config (fiemap and roll-forward recovery are both default-enabled).\nPR:L - Once the image is mounted, any unprivileged user can trigger the out-of-bounds access with a plain `FS_IOC_FIEMAP` ioctl \u2014 there is no capability check anywhere on the path from `do_vfs_ioctl` through `f2fs_fiemap` to `current_nat_addr`. On Android (vold auto-mounts f2fs portable/adoptable storage) and desktop/kiosk systems (udisks2/polkit), an unprivileged console user gets the attacker's f2fs image mounted without root.\nUI:N - The attacker supplies their own crafted image and issues the fiemap ioctl themselves; removable-media auto-mount by udisks2/vold happens without any deliberate victim action. The recovery-path variant likewise fires automatically during the mount the attacker caused.\nS:U - The out-of-bounds read and the bit-flip write both stay inside the kernel's own address space and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab out-of-bounds read at an offset the attacker chooses byte-by-byte up to ~1.18 MB past a small `kmemdup`'d `nat_bitmap`, so it is not a strictly bounded few-byte read. The bit read back selects which NAT block is parsed, and the resulting `ni.blk_addr` is returned to userspace as the fiemap extent's physical address, turning it into a repeatable oracle that discloses adjacent heap contents \u2014 kernel pointers and other slab objects \u2014 defeating KASLR.\nI:H - Via `f2fs_recover_xattr_data()` the bogus nid reaches `set_node_addr()`, which dirties a NAT set keyed on the out-of-range block offset; the next checkpoint then executes `f2fs_change_bit(block_off, nm_i->nat_bitmap)` in `set_to_next_nat()` and `__set_bit_le(nat_index, nm_i->empty_nat_bits)` in `__update_nat_bits()` \u2014 out-of-bounds heap writes at an attacker-chosen offset. A controlled single-bit flip into a groomed adjacent slab object (pointer, refcount, or credential/permission field) is a well-established privilege-escalation primitive.\nA:H - The reported symptom is a KASAN slab-out-of-bounds report, which panics on `panic_on_warn`/hardened Android and cloud kernels; on non-KASAN kernels the read can walk into unmapped memory and oops. The out-of-bounds bit flips additionally corrupt the NAT bitmap and neighbouring heap objects, and `f2fs_bug_on`/`f2fs_handle_error` paths in the checkpoint flush stop the filesystem, so the crash is reliably re-triggerable." } } }