Description
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: protect access to buffers with no active references
nilfs_lookup_dirty_data_buffers(), which iterates through the buffers
attached to dirty data folios/pages, accesses the attached buffers without
locking the folios/pages.
For data cache, nilfs_clear_folio_dirty() may be called asynchronously
when the file system degenerates to read only, so
nilfs_lookup_dirty_data_buffers() still has the potential to cause use
after free issues when buffers lose the protection of their dirty state
midway due to this asynchronous clearing and are unintentionally freed by
try_to_free_buffers().
Eliminate this race issue by adjusting the lock section in this function.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 3.10 | 5.4.291 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.12.13-1 | — |
| Debian 13 | linux | 6.12.13-1 | — |
| Debian 12 | linux | 6.1.129-1 | — |
| Debian 11 | linux | 5.10.237-1 | DLA-4178-1 |
| Debian 11 | linux-6.1 | 6.1.129-1~deb11u1 | DLA-4102-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1066.68 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-64.67 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1032.34 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1034.39 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1022.23 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1033.35 | USN-7651-4 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 +1 | 6.11.0-1015.15~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1028.32 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1015.17 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-hwe-6.11 | 6.11.0-26.26~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1029.29 | USN-7651-2 |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-64.67.1 | USN-7651-2 |
| Ubuntu 24.04 LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1014.15~24.04.1 | USN-7521-3 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1031.34 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1010.10 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1031.34.1 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1008.8 | — |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1022.22 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1031.31 | USN-7651-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1029.30 | USN-7651-3 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1031.35 | USN-7651-6 |
| Ubuntu 24.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1017.18 | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-140.150 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1084.91 | USN-7510-7 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1032.34~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1089.98 | USN-7510-3 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1034.39~22.04.1 | USN-7737-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1089.98.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1083.92 | USN-7511-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1033.35~22.04.1 | USN-7651-4 |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1081.87 | USN-7511-3, USN-7510-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1066.74 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 +1 | 6.8.0-64.67~22.04.1 | USN-7653-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1076.79 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1029.29~22.04.1 | USN-7651-2 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1079.85 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1080.85 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-64.67.1~22.04.1 | USN-7651-2 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1078.79 | USN-7510-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1031.34~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1037.37 | USN-7510-3 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1026.26 | USN-7510-7 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1029.30~22.04.1 | USN-7651-3 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1078.81 | USN-7510-7 |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1050.54 | USN-7602-1 |
| Ubuntu 20.04 LTS | linux | 5.4.0-216.236 | USN-7516-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1146.156 | USN-7516-9 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1084.91~20.04.1 | USN-7510-8 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1151.158 | USN-7516-3 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1089.98~20.04.1 | USN-7510-3 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1105.112 | USN-7517-3 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1149.158 | USN-7516-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1083.92~20.04.1 | USN-7512-1 |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1092.97 | USN-7516-6 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1076.79~20.04.1 | USN-7510-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1079.85~20.04.1 | USN-7510-7 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1133.142 | USN-7516-3 |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-140.150~20.04.1 | USN-7510-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1144.154 | USN-7516-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1081.87~20.04.1 | USN-7510-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1129.142 | USN-7539-1 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1079.83~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1064.68 | USN-7517-1 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2026.27 | USN-7651-5 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1025.26 | USN-7652-1 |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1077.79 | USN-7510-4 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1084.93 | USN-7510-4 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1025.26~22.04.1 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1084.91+fips1 | USN-7510-6 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1089.98+fips1 | USN-7510-5 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-140.150+fips1 | USN-7510-2 |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1083.92+fips1 | USN-7511-2 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1146.156+fips1 | USN-7516-8 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1151.158+fips1 | USN-7518-1 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1120.130 | USN-7516-8 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1149.158+fips1 | USN-7516-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2125.131 | USN-7907-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2104.110 | USN-7937-1 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1142.154 | USN-7907-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2088.94 | USN-7907-4 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1120.127 | USN-7930-2 |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux-hwe-5.15 | 5.15.0-142.152~20.04.1 | USN-7593-1 |
| Ubuntu Pro 20.04 LTS | linux-iot | 5.4.0-1051.54 | USN-7640-1 |
| Ubuntu Pro 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1039.39~20.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-245.257 | USN-7907-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1187.200 | USN-7907-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1146.156~18.04.1 | USN-7516-7 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1195.210 | USN-7907-5 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1151.158~18.04.1 | USN-7516-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1180.197 | USN-7907-3 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1149.158~18.04.1 | USN-7516-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-216.236~18.04.1 | USN-7516-5 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1092.97~18.04.1 | USN-7517-2 |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1169.174 | USN-7907-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1149.160 | USN-7907-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1144.154~18.04.1 | USN-7516-4 |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1129.142~18.04.1 | USN-7540-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-276.310 | USN-7930-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1188.203 | USN-7930-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1187.200~16.04.1 | USN-7907-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1195.210~16.04.1 | USN-7907-5 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1180.197~16.04.1 | USN-7907-3 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-245.257~16.04.1 | USN-7907-3 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1151.162 | USN-7930-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1149.160~16.04.1 | USN-7907-5 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1150.156 | USN-7930-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1195.210~14.04.1 | USN-7907-5 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-276.310~14.04.1 | USN-7930-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-101.33.4.3.el10uek | ELSA-2025-20530, ELSA-2025-20480 |
Advisories 50
- WID-SEC-2025-0461 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- USN-7593-1 linux-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7640-1 linux-iot vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7602-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7937-1 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7930-2 linux-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7907-1 linux, linux-aws, linux-aws-hwe, linux-kvm, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7907-5 linux-azure, linux-azure-4.15, linux-oracle, vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7907-2 linux-aws-fips, linux-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7907-4 linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7907-3 linux-gcp, linux-gcp-4.15, linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7930-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7737-1 linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7653-1 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7651-3 linux-aws-6.8, linux-gke, linux-gkeop, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-2 linux-ibm, linux-ibm-6.8, linux-lowlatency, linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7539-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-4 linux-gcp, linux-gcp-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-6 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-5 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7652-1 linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-1 linux, linux-azure, linux-azure-6.11, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oem-6.11, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7540-1 linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-6 linux-ibm vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-9 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7517-2 linux-ibm-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-3 linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7651-1 linux, linux-aws, linux-oem-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-1 linux, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-5 linux-hwe-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-7 linux-aws, linux-intel-iotg-5.15, linux-nvidia-tegra-igx, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7517-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-3 linux-azure, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-8 linux-aws-fips, linux-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7518-1 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7517-3 linux-bluefield vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-2 linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-3 linux-azure, linux-azure-5.15, linux-nvidia-tegra vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-4 linux-intel-iot-realtime, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-4 linux-oracle-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-6 linux-aws-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-8 linux-aws-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7511-3 linux-gke vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7512-1 linux-gcp-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-2 linux-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7511-1 linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-5 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7511-2 linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7516-7 linux-aws-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7510-1 linux, linux-gkeop, linux-ibm, linux-ibm-5.15, linux-intel-iotg, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
References
- https://git.kernel.org/stable/c/e1fc4a90a90ea8514246c45435662531975937d9
- https://git.kernel.org/stable/c/72cf688d0ce7e642b12ddc9b2a42524737ec1b4a
- https://git.kernel.org/stable/c/d8ff250e085a4c4cdda4ad1cdd234ed110393143
- https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439
- https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010b
- https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656
- https://git.kernel.org/stable/c/c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188
- https://git.kernel.org/stable/c/367a9bffabe08c04f6d725032cce3d891b2b9e1a