In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup()
Syzbot reported a null-ptr-deref bug:
ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512) ntfs3: loop0: Mark volume as dirty due to NTFS errors general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:d_flags_for_inode fs/dcache.c:1980 [inline] RIP: 0010:__d_add+0x5ce/0x800 fs/dcache.c:2796 Call Trace: <TASK> d_splice_alias+0x122/0x3b0 fs/dcache.c:3191 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3688 do_filp_open+0x264/0x4f0 fs/namei.c:3718 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd
If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL. And a null-ptr-deref may happen:
ntfs_lookup() dir_search_u() # inode->i_op is set to NULL d_splice_alias() __d_add() d_flags_for_inode() # inode->i_op->get_link null-ptr-deref
Fix this by adding a Check on inode->i_op before calling the d_splice_alias() function.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-toolsUpgrade python-perfUpgrade bpftoolUpgrade kernel-livepatch-5.15.117-72.142Upgrade bpftool-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpf-develUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-tools-develUpgrade kernel-livepatch-6.1.29-47.49Upgrade kernelUpgrade python3-perfUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-toolsUpgrade kernel-headersUpgrade perf-debuginfoUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-libbpf | Oct 16, 2025 | Sep 16, 2025 |
| Debian | — | Upgrade linux | Sep 18, 2025 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-xilinx-zynqmpUpgrade linux-gcpUpgrade linux-ibm-5.15Upgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-nvidiaUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linux-riscv-5.15Upgrade linux-gkeUpgrade linux-nvidia-tegra-igxUpgrade linuxUpgrade linux-gcp-5.15Upgrade linux-azureUpgrade linux-lowlatency-hwe-5.15Upgrade linux-realtimeUpgrade linux-bluefieldUpgrade linux-raspiUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-azure-fdeUpgrade linux-gkeopUpgrade linux-hwe-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-awsUpgrade linux-ibm | Sep 19, 2025 | Sep 17, 2025 |
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