{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43288",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:55.999Z",
        "datePublished": "2026-05-08T13:11:13.195Z",
        "dateUpdated": "2026-09-14T11:58:19.350Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-09-14T11:58:19.350Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: move ext4_percpu_param_init() before ext4_mb_init()\n\nWhen running `kvm-xfstests -c ext4/1k -C 1 generic/383` with the\n`DOUBLE_CHECK` macro defined, the following panic is triggered:\n\n==================================================================\nEXT4-fs error (device vdc): ext4_validate_block_bitmap:423:\n                        comm mount: bg 0: bad block bitmap checksum\nBUG: unable to handle page fault for address: ff110000fa2cc000\nPGD 3e01067 P4D 3e02067 PUD 0\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 0 UID: 0 PID: 2386 Comm: mount Tainted: G W\n                        6.18.0-gba65a4e7120a-dirty #1152 PREEMPT(none)\nRIP: 0010:percpu_counter_add_batch+0x13/0xa0\nCall Trace:\n <TASK>\n ext4_mark_group_bitmap_corrupted+0xcb/0xe0\n ext4_validate_block_bitmap+0x2a1/0x2f0\n ext4_read_block_bitmap+0x33/0x50\n mb_group_bb_bitmap_alloc+0x33/0x80\n ext4_mb_add_groupinfo+0x190/0x250\n ext4_mb_init_backend+0x87/0x290\n ext4_mb_init+0x456/0x640\n __ext4_fill_super+0x1072/0x1680\n ext4_fill_super+0xd3/0x280\n get_tree_bdev_flags+0x132/0x1d0\n vfs_get_tree+0x29/0xd0\n vfs_cmd_create+0x59/0xe0\n __do_sys_fsconfig+0x4f6/0x6b0\n do_syscall_64+0x50/0x1f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n==================================================================\n\nThis issue can be reproduced using the following commands:\n        mkfs.ext4 -F -q -b 1024 /dev/sda 5G\n        tune2fs -O quota,project /dev/sda\n        mount /dev/sda /tmp/test\n\nWith DOUBLE_CHECK defined, mb_group_bb_bitmap_alloc() reads\nand validates the block bitmap. When the validation fails,\next4_mark_group_bitmap_corrupted() attempts to update\nsbi->s_freeclusters_counter. However, this percpu_counter has not been\ninitialized yet at this point, which leads to the panic described above.\n\nFix this by moving the execution of ext4_percpu_param_init() to occur\nbefore ext4_mb_init(), ensuring the per-CPU counters are initialized\nbefore they are used."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ext4/super.c"
                    ],
                    "versions": [
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "0b3d80c56957862ba477ca0ce30c12cad9179c2b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "0d5fcb063cdabb9aeaa8554b7fedad2092c4150e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "9e9fb259bcddf459a0168f4a964e979e500a68a5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "bf5b609524497c195f801cd5707252384aed8149",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "aec095f3cc6cf209effd93278ce35be27db81d73",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d5e03cbb0c88cd1be39f2adc37d602230045964b",
                            "lessThan": "270564513489d98b721a1e4a10017978d5213bff",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ext4/super.c"
                    ],
                    "versions": [
                        {
                            "version": "3.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.17",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.128",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.75",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.16",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.6",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
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                    "nodes": [
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                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "6.1.188"
                                },
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.6.128"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0b3d80c56957862ba477ca0ce30c12cad9179c2b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d5fcb063cdabb9aeaa8554b7fedad2092c4150e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9e9fb259bcddf459a0168f4a964e979e500a68a5"
                },
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                    "url": "https://git.kernel.org/stable/c/bf5b609524497c195f801cd5707252384aed8149"
                },
                {
                    "url": "https://git.kernel.org/stable/c/aec095f3cc6cf209effd93278ce35be27db81d73"
                },
                {
                    "url": "https://git.kernel.org/stable/c/270564513489d98b721a1e4a10017978d5213bff"
                }
            ],
            "title": "ext4: move ext4_percpu_param_init() before ext4_mb_init()",
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