CVE-2026-43288None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ext4: move ext4_percpu_param_init() before ext4_mb_init() When running `kvm-xfstests -c ext4/1k -C 1 generic/383` with the `DOUBLE_CHECK` macro defined, the following …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
ext4: move ext4_percpu_param_init() before ext4_mb_init()
When running kvm-xfstests -c ext4/1k -C 1 generic/383 with the
DOUBLE_CHECK macro defined, the following panic is triggered:
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->s_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.
Linux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < 0b3d80c56957862ba477ca0ce30c12cad9179c2bLinux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < 0d5fcb063cdabb9aeaa8554b7fedad2092c4150eLinux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < 9e9fb259bcddf459a0168f4a964e979e500a68a5Linux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < bf5b609524497c195f801cd5707252384aed8149Linux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < aec095f3cc6cf209effd93278ce35be27db81d73Linux >= d5e03cbb0c88cd1be39f2adc37d602230045964b < 270564513489d98b721a1e4a10017978d5213bffLinux 3.17Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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