In the Linux kernel, the following vulnerability has been resolved:
fs: jfs: fix shift-out-of-bounds in dbAllocAG
Syzbot found a crash : UBSAN: shift-out-of-bounds in dbAllocAG. The underlying bug is the missing check of bmp->db_agl2size. The field can be greater than 64 and trigger the shift-out-of-bounds.
Fix this bug by adding a check of bmp->db_agl2size in dbMount since this field is used in many following functions. The upper bound for this field is L2MAXL2SIZE - L2MAXAG, thanks for the help of Dave Kleikamp. Note that, for maintenance, I reorganized error handling code of dbMount.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernelUpgrade kernel-livepatch-5.10.165-143.735Upgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernel-livepatch-4.14.304-226.531Upgrade kernel-tools-develUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade kernel-toolsUpgrade perfUpgrade kernel-headersUpgrade python-perfUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfoUpgrade perf-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Oct 24, 2025 | Oct 24, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 22, 2025 |
| Ubuntu | — | Upgrade linux-aws-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracle-5.4Upgrade linux-lowlatencyUpgrade linux-azureUpgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-bluefieldUpgrade linux-intel-iotgUpgrade linux-aws-hweUpgrade linux-raspiUpgrade linux-iotUpgrade linux-awsUpgrade linux-nvidia-tegra-5.15Upgrade linux-realtimeUpgrade linux-hweUpgrade linux-gcpUpgrade linux-hwe-5.4Upgrade linux-gcp-4.15Upgrade linux-azure-fipsUpgrade linuxUpgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-azure-4.15Upgrade linux-xilinx-zynqmpUpgrade linux-gcp-5.4Upgrade linux-aws-fipsUpgrade linux-ibm-5.4Upgrade linux-gkeopUpgrade linux-riscv-5.15Upgrade linux-fipsUpgrade linux-gcp-fipsUpgrade linux-azure-fde-5.15Upgrade linux-azure-5.4Upgrade linux-oracle-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-oracleUpgrade linux-azure-5.15 | Oct 28, 2025 | Oct 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Oct 22, 2025 |
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