In the Linux kernel, the following vulnerability has been resolved:
jfs: validate AG parameters in dbMount() to prevent crashes
Validate db_agheight, db_agwidth, and db_agstart in dbMount to catch corrupted metadata early and avoid undefined behavior in dbAllocAG. Limits are derived from L2LPERCTL, LPERCTL/MAXAG, and CTLTREESIZE:
- agheight: 0 to L2LPERCTL/2 (0 to 5) ensures shift (L2LPERCTL - 2*agheight) >= 0. - agwidth: 1 to min(LPERCTL/MAXAG, 2^(L2LPERCTL - 2*agheight)) ensures agperlev >= 1. - Ranges: 1-8 (agheight 0-3), 1-4 (agheight 4), 1 (agheight 5). - LPERCTL/MAXAG = 1024/128 = 8 limits leaves per AG; 2^(10 - 2*agheight) prevents division to 0. - agstart: 0 to CTLTREESIZE-1 - agwidth*(MAXAG-1) keeps ti within stree (size 1365). - Ranges: 0-1237 (agwidth 1), 0-348 (agwidth 8).
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1400:9 shift exponent -335544310 is negative CPU: 0 UID: 0 PID: 5822 Comm: syz-executor130 Not tainted 6.14.0-rc5-syzkaller #0 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 dbAllocAG+0x1087/0x10b0 fs/jfs/jfs_dmap.c:1400 dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613 jfs_ioc_trim+0x45a/0x6b0 fs/jfs/jfs_discard.c:105 jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 7, 2025 | Jul 4, 2025 |
| Oracle_linux | — | Upgrade kernel-uek | Sep 10, 2025 | Jul 4, 2025 |
| Redhat_linux | — | — | Jul 9, 2025 | Jul 4, 2025 |
| Ubuntu | — | Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-awsUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-1043-oracleUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1047-raspiUpgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.8.0-1043-gke-64kUpgrade linux-image-gke-64k-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-6.8.0-1046-awsUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-1046-nvidia-lowlatency-64kUpgrade linux-image-gke-6.8Upgrade linux-image-6.8.1-1041-realtimeUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-xilinx-6.8Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-ibm-6.8Upgrade linux-image-generic-64kUpgrade linux-image-aws-fips-6.8Upgrade linux-image-generic-6.14Upgrade linux-image-6.8.0-1047-gcp-fipsUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-100-lowlatencyUpgrade linux-image-6.8.0-1046-nvidia-lowlatencyUpgrade linux-image-6.8.0-1047-gcp-64kUpgrade linux-image-ibmUpgrade linux-image-oem-22.04bUpgrade linux-image-azureUpgrade linux-image-raspi-6.8Upgrade linux-image-kvmUpgrade linux-image-realtime-6.8.1Upgrade linux-image-6.8.0-100-generic-64kUpgrade linux-image-oracle-6.8Upgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1046-aws-fipsUpgrade linux-image-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-raspiUpgrade linux-image-generic-6.8Upgrade linux-image-gcp-fipsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-fips-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-gke-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-virtual-6.8Upgrade linux-image-6.8.0-1043-oracle-64kUpgrade linux-image-6.8.0-100-lowlatency-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-100-genericUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1043-gkeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-aws-6.8Upgrade linux-image-6.14.0-34-generic-64kUpgrade linux-image-6.8.0-1044-ibmUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1023-xilinxUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-aws-64k-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-azure-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-100-fipsUpgrade linux-image-virtualUpgrade linux-image-virtual-6.14Upgrade linux-image-6.8.0-1047-gcpUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-realtimeUpgrade linux-image-lowlatency-64kUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1030-gkeopUpgrade linux-image-6.14.0-34-genericUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-1046-azure-fipsUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1046-nvidia-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gkeopUpgrade linux-image-oracle-64kUpgrade linux-image-aws-lts-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.8.0-1046-nvidiaUpgrade linux-image-6.8.0-1046-aws-64kUpgrade linux-image-genericUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-oracleUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-2037-raspi-realtimeUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-gcp-6.8Upgrade linux-image-generic-64k-6.14Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-gcpUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-xilinxUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-fipsUpgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-1046-azureUpgrade linux-image-aws-64kUpgrade linux-image-nvidia-hwe-22.04 | Jul 9, 2025 | Jul 4, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 19, 2025 | Jul 4, 2025 |
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