In the Linux kernel, the following vulnerability has been resolved:
ext4: aovid use-after-free in ext4_ext_insert_extent()
As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values:
ext4_ext_insert_extent path = *ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = *ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); *ppath = path = NULL; path = kcalloc() = 3000 *ppath = 3000; return path; /* here path is still 2000, UAF! */ eh = path[depth].p_hdr
================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...]
Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...]
Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ==================================================================
So use *ppath to update the path to avoid the above problem.
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 kernel-livepatch-5.15.168-114.166Upgrade python-perfUpgrade perfUpgrade kernel-livepatch-4.14.355-276.618Upgrade kernel-toolsUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade bpftoolUpgrade kernel-livepatch-5.10.227-219.884Upgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfo | Jan 22, 2025 | Oct 21, 2024 |
| Amazon_linux | — | Upgrade kernel | Apr 18, 2025 | Oct 21, 2024 |
| Amazon_linux_2023 | — | Upgrade kernel-develUpgrade kernel-libbpf-staticUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-libbpf-develUpgrade python3-perfUpgrade kernel-tools-develUpgrade kernel-modules-extra-commonUpgrade perfUpgrade perf-debuginfoUpgrade kernel-livepatch-6.1.115-126.197Upgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel-libbpfUpgrade kernel-headersUpgrade kernel-modules-extraUpgrade kernel-debuginfo | Feb 17, 2025 | Oct 21, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Nov 11, 2024 | Oct 21, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perf | Jan 14, 2025 | Oct 21, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade bpftoolUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelists | Feb 11, 2025 | Oct 21, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perfUpgrade bpftoolUpgrade kernel-tools | Feb 11, 2025 | Oct 21, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel | Jan 15, 2025 | Oct 21, 2024 |
| Oracle_linux | — | Upgrade kernel-uek | Dec 17, 2024 | Oct 21, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | May 15, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-raspi-hwe-18.04Upgrade linux-image-oem-20.04Upgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-gkeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-24.04Upgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-5.15.0-1078-azureUpgrade linux-image-genericUpgrade linux-image-intelUpgrade linux-image-azure-cvmUpgrade linux-image-4.4.0-1116-fipsUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-5.15.0-1073-awsUpgrade linux-image-5.4.0-1116-fipsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-azure-lts-18.04Upgrade linux-image-virtual-hwe-18.04Upgrade linux-image-lowlatency-hwe-16.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-gcp-fipsUpgrade linux-image-azureUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-generic-lpaeUpgrade linux-image-aws-lts-18.04Upgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-5.4.0-1099-bluefieldUpgrade linux-image-generic-lts-xenialUpgrade linux-image-5.4.0-1142-awsUpgrade linux-image-oracle-lts-18.04Upgrade linux-image-4.4.0-1184-awsUpgrade linux-image-5.4.0-1140-awsUpgrade linux-image-4.4.0-271-genericUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-4.15.0-1166-kvmUpgrade linux-image-4.15.0-1145-oracleUpgrade linux-image-virtual-lts-xenialUpgrade linux-image-5.4.0-208-genericUpgrade linux-image-azure-fips-4.15Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-gcp-64kUpgrade linux-image-realtimeUpgrade linux-image-intel-iotgUpgrade linux-image-nvidiaUpgrade linux-image-gcp-4.15Upgrade linux-image-aws-hweUpgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-5.15.0-127-genericUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-raspiUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.4.0-1138-oracleUpgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-4.15.0-2100-azure-fipsUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-4.15.0-2084-gcp-fipsUpgrade linux-image-4.15.0-240-genericUpgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-fipsUpgrade linux-image-oem-22.04dUpgrade linux-image-azure-lts-22.04Upgrade linux-image-6.8.0-57-genericUpgrade linux-image-oemUpgrade linux-image-oem-22.04Upgrade linux-image-gkeopUpgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-6.8.0-1023-awsUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-4.15.0-1191-azureUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-5.4.0-1145-azureUpgrade linux-image-lowlatency-64kUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-gkeop-5.15Upgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-5.4.0-208-lowlatencyUpgrade linux-image-oracle-4.15Upgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-generic-64kUpgrade linux-image-aws-fipsUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-5.4.0-1127-kvmUpgrade linux-image-4.15.0-1183-awsUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-gcp-lts-18.04Upgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-azure-nvidiaUpgrade linux-image-4.15.0-1138-fipsUpgrade linux-image-5.4.0-1143-gcpUpgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-gcp-fips-4.15Upgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-gkeop-6.8Upgrade linux-image-generic-hwe-18.04Upgrade linux-image-oem-22.04aUpgrade linux-image-5.4.0-1048-iotUpgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-bluefieldUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-ibmUpgrade linux-image-generic-hwe-16.04Upgrade linux-image-oem-20.04cUpgrade linux-image-azure-fipsUpgrade linux-image-azure-4.15Upgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-5.4.0-1058-xilinx-zynqmpUpgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-4.4.0-1147-kvmUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-aws-lts-20.04Upgrade linux-image-aws-fips-4.15Upgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-azure-lts-20.04Upgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-oem-20.04bUpgrade linux-image-oracle-64kUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-virtual-hwe-16.04Upgrade linux-image-oem-24.04bUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-azure-fdeUpgrade linux-image-raspi2Upgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-osp1Upgrade linux-image-awsUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-4.15.0-2121-aws-fipsUpgrade linux-image-4.4.0-271-lowlatencyUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-oem-20.04dUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-lowlatencyUpgrade linux-image-5.4.0-1086-ibmUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-gke-5.15Upgrade linux-image-4.15.0-1176-gcpUpgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-5.4.0-1129-raspiUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-gcpUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-aws-4.15Upgrade linux-image-gcp-lts-20.04Upgrade linux-image-virtualUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-5.4.0-208-generic-lpaeUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-oem-22.04bUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-4.15.0-240-lowlatencyUpgrade linux-image-4.4.0-1146-awsUpgrade linux-image-oracleUpgrade linux-image-kvm | Dec 18, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 14, 2025 | Oct 21, 2024 |
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