In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix shift-out-of-bounds due to too large exponent of block size
If field s_log_block_size of superblock data is corrupted and too large, init_nilfs() and load_nilfs() still can trigger a shift-out-of-bounds warning followed by a kernel panic (if panic_on_warn is set):
shift exponent 38973 is too large for 32-bit type 'int' Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 ubsan_epilogue+0xb/0x50 __ubsan_handle_shift_out_of_bounds.cold.12+0x17b/0x1f5 init_nilfs.cold.11+0x18/0x1d [nilfs2] nilfs_mount+0x9b5/0x12b0 [nilfs2] ...
This fixes the issue by adding and using a new helper function for getting block size with sanity check.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade python-perfUpgrade kernel-livepatch-5.10.165-143.735Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-develUpgrade bpftoolUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfoUpgrade perfUpgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Ubuntu | — | Upgrade linux-azure-5.15Upgrade linux-kvmUpgrade linux-azureUpgrade linux-azure-fdeUpgrade linux-gkeopUpgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-oracleUpgrade linux-ibmUpgrade linux-awsUpgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-gkeUpgrade linux-lowlatencyUpgrade linux-oracle-5.15Upgrade linuxUpgrade linux-azure-fde-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-intel-iotgUpgrade linux-riscv-5.15Upgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-nvidia-tegra-5.15Upgrade linux-raspi | Jan 6, 2026 | Jan 2, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 30, 2025 |
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