In the Linux kernel, the following vulnerability has been resolved:
ext4: fix use-after-free in ext4_orphan_cleanup
I caught a issue as follows: ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710
CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ==================================================================
Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF
To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-zfcpdump-modules-extraUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-rt-develUpgrade bpftoolUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdumpUpgrade kernel-rt-debugUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-debug-develUpgrade kernel-modules-extraUpgrade kernel-zfcpdump-develUpgrade kernel-rtUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-modulesUpgrade kernel-abi-stablelistsUpgrade kernel-rt-debug-modules-extraUpgrade kernel-docUpgrade kernel-modulesUpgrade kernel-rt-modulesUpgrade kernel-debugUpgrade kernel-tools-libsUpgrade kernel-rt-debug-coreUpgrade kernel-coreUpgrade kernel-debug-coreUpgrade kernel-debug-modulesUpgrade python3-perfUpgrade kernel-debug-develUpgrade kernel-develUpgrade kernelUpgrade perfUpgrade kernel-rt-coreUpgrade kernel-tools-libs-develUpgrade kernel-cross-headersUpgrade kernel-rt-modules-extra | Feb 10, 2026 | Feb 9, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade perfUpgrade python-perfUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-livepatch-5.10.165-143.735Upgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade python-perf-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.15.90-54.138 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 10, 2025 | Dec 10, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-tools | Mar 10, 2026 | Mar 10, 2026 |
| Oracle_linux | — | Upgrade kernel | Feb 11, 2026 | Dec 9, 2025 |
| Redhat_linux | — | Upgrade kernelUpgrade kernel-rtNo solution exists | Mar 13, 2026 | Dec 9, 2025 |
| Rocky_linux | — | Upgrade bpftoolUpgrade kernel-toolsUpgrade kernel-debug-modules-extraUpgrade python3-perfUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-libs-develUpgrade kernelUpgrade kernel-modules-extraUpgrade perf-debuginfoUpgrade kernel-debugUpgrade kernel-debug-coreUpgrade kernel-coreUpgrade kernel-modulesUpgrade kernel-develUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-debug-develUpgrade kernel-tools-debuginfoUpgrade kernel-debug-modulesUpgrade bpftool-debuginfoUpgrade kernel-debug-debuginfoUpgrade kernel-tools-libs | Feb 16, 2026 | Feb 15, 2026 |
| Ubuntu | — | Upgrade linux-hwe-5.4Upgrade linux-azure-5.15Upgrade linux-ibm-5.4Upgrade linux-gcpUpgrade linux-oracle-5.4Upgrade linuxUpgrade linux-aws-fipsUpgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.15Upgrade linux-riscv-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-gkeopUpgrade linux-gcp-5.4Upgrade linux-gkeUpgrade linux-azure-fipsUpgrade linux-lowlatencyUpgrade linux-gcp-fipsUpgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-realtimeUpgrade linux-gcp-5.15Upgrade linux-azureUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-bluefieldUpgrade linux-azure-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-aws-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracleUpgrade linux-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-iot | Dec 11, 2025 | Dec 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 9, 2025 |
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