{ "schema_version": "1.6.1", "id": "RPI-CVE-2025-22121", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2025-22121" ], "published": "2025-04-16T14:14:59Z", "summary": "ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()\n\nThere's issue as follows:\nBUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790\nRead of size 4 at addr ffff88807b003000 by task syz-executor.0/15172\n\nCPU: 3 PID: 15172 Comm: syz-executor.0\nCall Trace:\n __dump_stack lib/dump_stack.c:82 [inline]\n dump_stack+0xbe/0xfd lib/dump_stack.c:123\n print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\n ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137\n ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896\n ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323\n evict+0x39f/0x880 fs/inode.c:622\n iput_final fs/inode.c:1746 [inline]\n iput fs/inode.c:1772 [inline]\n iput+0x525/0x6c0 fs/inode.c:1758\n ext4_orphan_cleanup fs/ext4/super.c:3298 [inline]\n ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300\n mount_bdev+0x355/0x410 fs/super.c:1446\n legacy_get_tree+0xfe/0x220 fs/fs_context.c:611\n vfs_get_tree+0x8d/0x2f0 fs/super.c:1576\n do_new_mount fs/namespace.c:2983 [inline]\n path_mount+0x119a/0x1ad0 fs/namespace.c:3316\n do_mount+0xfc/0x110 fs/namespace.c:3329\n __do_sys_mount fs/namespace.c:3540 [inline]\n __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514\n do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nMemory state around the buggy address:\n ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n>ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ^\n ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\nAbove issue happens as ext4_xattr_delete_inode() isn't check xattr\nis valid if xattr is in inode.\nTo solve above issue call xattr_check_inode() check if xattr if valid\nin inode. In fact, we can directly verify in ext4_iget_extra_inode(),\nso that there is no divergent verification.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:N/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", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1", "1:6.6.74-1+rpt1", "1:6.12.20-1+rpt1~bpo12+1", "1:6.12.25-1+rpt1", "1:6.12.34-1+rpt1~bookworm", "1:6.12.47-1+rpt1~bookworm" ], "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": 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"https://git.kernel.org/stable/c/5701875f9609b000d91351eaa6bfd97fe2f157f4" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T12:19:11Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.4, "cvss_v3_severity": "High", "scenario": "AV:L - Exploitation requires the attacker-crafted ext4 image to be presented to the local kernel as a block device \u2014 a USB stick on an automounting desktop/kiosk, a loop/NBD/iSCSI-backed device, or a container/VM disk image \u2014 reaching the bug through the mount(2) syscall path. No network protocol handler is involved, and physical access is not strictly required since loop and network-block-backed images work equally well.\nAC:L - The attacker fully controls every byte of the on-disk image, including the ea_inode feature bit, the inode's i_extra_isize, the xattr magic, the entry array, and which inode sits last in its inode-table block so the walk runs off the end of the buffer_head page allocation. The corruption is deterministic at mount during orphan cleanup with no race to win and no dependency on kernel memory layout the attacker cannot influence.\nPR:N - The attacker needs no account or privilege on the target system \u2014 they only supply the malicious filesystem image, which is then mounted by root, by an automount daemon such as udisks2, or by a container/VM image-handling service acting on the attacker's data. All privileged operations along the path are performed by the victim system on the attacker's behalf.\nUI:N - On the common desktop, kiosk, and appliance configurations where udisks2/systemd automounts removable media, plugging in the device triggers the mount with no human participation, and the bug fires immediately during ext4_orphan_cleanup() inside ext4_fill_super() rather than requiring any subsequent file access. Container and VM image-mount services likewise mount attacker-supplied images unattended.\nS:U - The out-of-bounds read and write occur in kernel heap memory within the same kernel security authority that hosts the vulnerable ext4 code. There is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The loop performs an unbounded (pre-mitigation) or several-byte-past-the-allocation (post-mitigation) out-of-bounds read of adjacent kernel heap memory past the inode-table buffer_head, and those leaked bytes are consumed as e_value_inum/e_hash/e_value_size values that steer subsequent inode lookups and quota accounting, making adjacent kernel memory contents observable through filesystem state and error output.\nI:H - `entry->e_value_inum = 0; entry->e_value_size = 0;` writes 8 zero bytes through an out-of-bounds entry pointer into adjacent kernel heap memory, and the OOB-derived inode numbers drive ext4_xattr_inode_dec_ref()/ext4_orphan_add() to decrement refcounts and orphan arbitrary inodes. This combination of controlled kernel heap zeroing plus arbitrary on-disk metadata corruption is a usable memory-corruption primitive, not a bounded misread.\nA:H - KASAN reproduces the issue as a use-after-free/out-of-bounds access past a page-sized buffer_head allocation during mount; on a production kernel the same access corrupts adjacent slab memory and the bogus inode ref-count decrements trigger EXT4-fs errors and oops/panic. The crash occurs during ext4_fill_super() and can be repeated on every mount attempt." } } }