{ "cveId": "CVE-2026-43288", "url": "https://patchblox.com/security/cve/CVE-2026-43288", "summary": "CVE-2026-43288 is fixed in 80 products on 1 platform, first by ALAS2023-2026-1543, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: ext4: move ext4_percpu_param_init() before ext4_...", "description": "In the Linux kernel, the following vulnerability has been resolved: ext4: move ext4_percpu_param_init() before ext4_mb_init() When running \u0060kvm-xfstests -c ext4/1k -C 1 generic/383\u0060 with the \u0060DOUBLE_CHECK\u0060 macro defined, the following panic is triggered: ================================================================== EXT4-fs error (device vdc): ext4_validate_block_bitmap:423: comm mount: bg 0: bad block bitmap checksum BUG: unable to handle page fault for address: ff110000fa2cc000 PGD 3e01067 P4D 3e02067 PUD 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 0 UID: 0 PID: 2386 Comm: mount Tainted: G W 6.18.0-gba65a4e7120a-dirty #1152 PREEMPT(none) RIP: 0010:percpu_counter_add_batch\u002B0x13/0xa0 Call Trace: \u003CTASK\u003E ext4_mark_group_bitmap_corrupted\u002B0xcb/0xe0 ext4_validate_block_bitmap\u002B0x2a1/0x2f0 ext4_read_block_bitmap\u002B0x33/0x50 mb_group_bb_bitmap_alloc\u002B0x33/0x80 ext4_mb_add_groupinfo\u002B0x190/0x250 ext4_mb_init_backend\u002B0x87/0x290 ext4_mb_init\u002B0x456/0x640 __ext4_fill_super\u002B0x1072/0x1680 ext4_fill_super\u002B0xd3/0x280 get_tree_bdev_flags\u002B0x132/0x1d0 vfs_get_tree\u002B0x29/0xd0 vfs_cmd_create\u002B0x59/0xe0 __do_sys_fsconfig\u002B0x4f6/0x6b0 do_syscall_64\u002B0x50/0x1f0 entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e ================================================================== This issue can be reproduced using the following commands: mkfs.ext4 -F -q -b 1024 /dev/sda 5G tune2fs -O quota,project /dev/sda mount /dev/sda /tmp/test With DOUBLE_CHECK defined, mb_group_bb_bitmap_alloc() reads and validates the block bitmap. When the validation fails, ext4_mark_group_bitmap_corrupted() attempts to update sbi-\u003Es_freeclusters_counter. However, this percpu_counter has not been initialized yet at this point, which leads to the panic described above. Fix this by moving the execution of ext4_percpu_param_init() to occur before ext4_mb_init(), ensuring the per-CPU counters are initialized before they are used.", "published": "2026-04-07T09:00:00Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.0013, "epssPercentile": 0.02651, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.77-99.140.amzn2023", "fix": "ALAS2023-2026-1543", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1543", "released": "2026-04-07T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.77-99.140.amzn2023", "fix": "ALAS2023-2026-1543", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1543", "released": "2026-04-07T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.16-18.222.amzn2023", "fix": "ALAS2023-2026-1702", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.16-18.222.amzn2023", "fix": "ALAS2023-2026-1702", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-livepatch-6.12.77-99.140", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-1543", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1543", "released": "2026-04-07T09:00:00Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.16-18.222", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-1702", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702", 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