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OpenAdvisories
Medium · 5.5 CVE-2024-26685 EUVD-2024-23947GHSA-xq4m-hfgr-r2x5

nilfs2: fix potential bug in end_buffer_async_write

Published Apr 3, 2024 · Updated May 23, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.5 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix potential bug in end_buffer_async_write

According to a syzbot report, end_buffer_async_write(), which handles the
completion of block device writes, may detect abnormal condition of the
buffer async_write flag and cause a BUG_ON failure when using nilfs2.

Nilfs2 itself does not use end_buffer_async_write(). But, the async_write
flag is now used as a marker by commit 7f42ec394156 ("nilfs2: fix issue
with race condition of competition between segments for dirty blocks") as
a means of resolving double list insertion of dirty blocks in
nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the
resulting crash.

This modification is safe as long as it is used for file data and b-tree
node blocks where the page caches are independent. However, it was
irrelevant and redundant to also introduce async_write for segment summary
and super root blocks that share buffers with the backing device. This
led to the possibility that the BUG_ON check in end_buffer_async_write
would fail as described above, if independent writebacks of the backing
device occurred in parallel.

The use of async_write for segment summary buffers has already been
removed in a previous change.

Fix this issue by removing the manipulation of the async_write flag for
the remaining super root block buffer.

Affected products

VendorProductAffectedFixed
Linux Linux 3.2.52 – < 3.3, 3.4.83 – < 3.5, 3.10.16 – < 3.11, 3.11.5 – < 3.12, 3.12 3.3

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.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.7.7-1 —
Debian 13 linux 6.7.7-1 —
Debian 12 linux 6.1.82-1 —
Debian 11 linux 5.10.216-1 DSA-5681-1
Debian 10 linux 4.19.316-1 DLA-3840-1
Debian 10 linux-5.10 5.10.216-1~deb10u1 DLA-3842-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1043.45 —
Ubuntu 22.04 LTS linux +1 5.15.0-106.116 USN-6766-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1061.67 USN-6766-3
Ubuntu 22.04 LTS linux-aws-6.5 6.5.0-1023.23~22.04.1 USN-6895-3
Ubuntu 22.04 LTS linux-azure 5.15.0-1063.72 USN-6766-1
Ubuntu 22.04 LTS linux-azure-6.5 6.5.0-1024.25~22.04.1 USN-6895-2
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1063.72.1 USN-6766-1
Ubuntu 22.04 LTS linux-gcp 5.15.0-1059.67 USN-6766-1
Ubuntu 22.04 LTS linux-gcp-6.5 6.5.0-1024.26~22.04.1 USN-6895-2
Ubuntu 22.04 LTS linux-gke +1 5.15.0-1058.63 USN-6766-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1044.51 USN-6766-1
Ubuntu 22.04 LTS linux-hwe-6.5 6.5.0-44.44~22.04.1 USN-6900-1
Ubuntu 22.04 LTS linux-ibm +1 5.15.0-1054.57 USN-6766-2, USN-6766-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1057.63 USN-6795-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.5 6.5.0-44.44.1~22.04.1 USN-6895-3
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1054.55 USN-6766-1
Ubuntu 22.04 LTS linux-nvidia-6.5 6.5.0-1023.24 USN-6895-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1026.26 —
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1015.15 —
Ubuntu 22.04 LTS linux-oem-6.5 6.5.0-1027.28 USN-6895-4
Ubuntu 22.04 LTS linux-oracle 5.15.0-1059.65 USN-6766-1
Ubuntu 22.04 LTS linux-oracle-6.5 6.5.0-1026.26~22.04.1 USN-6895-3
Ubuntu 22.04 LTS linux-riscv +22 No fix yet —
Ubuntu 22.04 LTS linux-starfive-6.5 6.5.0-1017.18~22.04.1 USN-6895-3
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1030.34 —
Ubuntu 20.04 LTS linux 5.4.0-181.201 USN-6767-1
Ubuntu 20.04 LTS linux-aws 5.4.0-1124.134 USN-6767-1
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1061.67~20.04.1 USN-6766-3
Ubuntu 20.04 LTS linux-azure 5.4.0-1129.136 USN-6767-1
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1063.72~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-azure-fde-5.15 5.15.0-1063.72~20.04.1.1 USN-6766-1
Ubuntu 20.04 LTS linux-bluefield 5.4.0-1084.91 USN-6767-2
Ubuntu 20.04 LTS linux-gcp 5.4.0-1128.137 USN-6767-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1059.67~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-gke +26 No fix yet —
Ubuntu 20.04 LTS linux-gkeop 5.4.0-1091.95 USN-6767-1
Ubuntu 20.04 LTS linux-gkeop-5.15 5.15.0-1044.51~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-hwe-5.15 +1 5.15.0-106.116~20.04.1 USN-6766-2, USN-6766-1
Ubuntu 20.04 LTS linux-ibm 5.4.0-1071.76 USN-6767-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1054.57~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-intel-iotg-5.15 5.15.0-1058.64~20.04.1 USN-6828-1
Ubuntu 20.04 LTS linux-iot 5.4.0-1036.37 USN-6767-1
Ubuntu 20.04 LTS linux-kvm 5.4.0-1112.119 USN-6767-1
Ubuntu 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1027.27~20.04.1 —
Ubuntu 20.04 LTS linux-oracle 5.4.0-1123.132 USN-6767-1
Ubuntu 20.04 LTS linux-oracle-5.15 5.15.0-1059.65~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-raspi 5.4.0-1108.120 USN-6767-1
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1057.61~20.04.1 —
Ubuntu 20.04 LTS linux-xilinx-zynqmp 5.4.0-1043.47 USN-6767-1
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Show 13 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2001.1 —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1054.56 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1062.70 —
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 22.04 LTS linux-aws-fips 5.15.0-1061.67+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1063.72+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-106.116+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1059.67+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1124.134+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1129.136+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1098.108 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1128.137+fips1 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-aws-fips 4.15.0-2116.122 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-azure-fips 4.15.0-2095.101 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips 4.15.0-1133.144 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-gcp-fips 4.15.0-2079.85 —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips 4.4.0-1111.118 —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 18.04 LTS linux 4.15.0-235.247 USN-7342-1
Ubuntu Pro 18.04 LTS linux-aws 4.15.0-1178.191 USN-7344-1
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1124.134~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-azure-4.15 4.15.0-1186.201 USN-7344-2
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1129.136~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-gcp-4.15 4.15.0-1171.188 USN-7344-1
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1128.137~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-181.201~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1071.76~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-kvm 4.15.0-1161.166 USN-7344-1
Ubuntu Pro 18.04 LTS linux-oracle 4.15.0-1140.151 USN-7344-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1123.132~18.04.1 USN-6767-1
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1108.120~18.04.1 USN-6767-1
Ubuntu Pro 16.04 LTS linux 4.4.0-266.300 USN-7332-1
Ubuntu Pro 16.04 LTS linux-aws 4.4.0-1179.194 USN-7332-1
Ubuntu Pro 16.04 LTS linux-aws-hwe 4.15.0-1178.191~16.04.1 USN-7344-1
Ubuntu Pro 16.04 LTS linux-azure 4.15.0-1186.201~16.04.1 USN-7344-2
Ubuntu Pro 16.04 LTS linux-gcp 4.15.0-1171.188~16.04.1 USN-7344-1
Ubuntu Pro 16.04 LTS linux-hwe 4.15.0-235.247~16.04.1 USN-7342-1
Ubuntu Pro 16.04 LTS linux-kvm 4.4.0-1142.153 USN-7332-2
Ubuntu Pro 16.04 LTS linux-oracle 4.15.0-1140.151~16.04.1 USN-7344-1
Ubuntu Pro 14.04 LTS linux No fix yet —
Ubuntu Pro 14.04 LTS linux-aws 4.4.0-1141.147 USN-7332-1
Ubuntu Pro 14.04 LTS linux-azure 4.15.0-1186.201~14.04.1 USN-7344-2
Ubuntu Pro 14.04 LTS linux-lts-xenial 4.4.0-266.300~14.04.1 USN-7332-3
ReleasePackageFixed inAdvisory
SLES 15 SP6 kernel-64kb +3 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-azure +1 6.4.0-150600.8.5.4 SUSE-SU-2024:2135-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.7.3.150600.12.2.7 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-docs 6.4.0-150600.23.7.4 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-source 6.4.0-150600.23.7.2 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-syms 6.4.0-150600.23.7.1 SUSE-SU-2024:2203-1
SLES 15 SP6 kernel-syms-azure 6.4.0-150600.8.5.1 SUSE-SU-2024:2135-1
SLES 15 SP5 kernel-64kb +5 5.14.21-150500.55.62.2 SUSE-SU-2024:1659-1
SLES 15 SP5 kernel-azure +2 5.14.21-150500.33.48.1 SUSE-SU-2024:1490-1
SLES 15 SP5 kernel-default-base 5.14.21-150500.55.62.2.150500.6.27.2 SUSE-SU-2024:1659-1
SLES 15 SP5 kernel-syms 5.14.21-150500.55.62.1 SUSE-SU-2024:1659-1
Show 6 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.0 kernel-default-base 6.4.0-17.1.1.51 SUSE-SU-2025:20008-1
SLE Micro 6.0 kernel-source +2 6.4.0-18.1 SUSE-SU-2025:20008-1
SLE Micro 5.5 kernel-default 5.14.21-150500.55.62.2 SUSE-SU-2024:1659-1
SLE Micro 5.5 kernel-default-base 5.14.21-150500.55.62.2.150500.6.27.2 SUSE-SU-2024:1659-1
SLE Micro 5.5 kernel-rt +1 5.14.21-150500.13.52.1 SUSE-SU-2024:1663-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_1 1-150600.1.5.1 SUSE-SU-2024:2973-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_1 1-150600.13.3.7 SUSE-SU-2024:2203-1
SLE Live Patching 15 SP5 kernel-default 5.14.21-150500.55.62.2 SUSE-SU-2024:1659-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5-RT_Update_14 1-150500.11.5.1 SUSE-SU-2024:1663-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_13 1-150500.11.3.2 SUSE-SU-2024:1659-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.5.1 SUSE-SU-2024:2973-1
SUSE Real Time Module 15 SP5 kernel-rt +3 5.14.21-150500.13.52.1 SUSE-SU-2024:1663-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +2 6.4.0-150600.23.7.1 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-64kb +5 6.4.0-150600.23.7.3 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-azure +1 6.4.0-150600.8.5.4 SUSE-SU-2024:2135-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.7.3.150600.12.2.7 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-docs 6.4.0-150600.23.7.4 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.5.1 SUSE-SU-2024:2973-1
openSUSE Leap 15.6 kernel-source 6.4.0-150600.23.7.2 SUSE-SU-2024:2203-1
openSUSE Leap 15.6 kernel-syms-azure 6.4.0-150600.8.5.1 SUSE-SU-2024:2135-1
openSUSE Leap 15.5 dtb-aarch64 +2 5.14.21-150500.55.62.1 SUSE-SU-2024:1659-1
openSUSE Leap 15.5 kernel-64kb +7 5.14.21-150500.55.62.2 SUSE-SU-2024:1659-1
openSUSE Leap 15.5 kernel-azure +2 5.14.21-150500.33.48.1 SUSE-SU-2024:1490-1
openSUSE Leap 15.5 kernel-default-base 5.14.21-150500.55.62.2.150500.6.27.2 SUSE-SU-2024:1659-1
openSUSE Leap 15.5 kernel-rt +3 5.14.21-150500.13.52.1 SUSE-SU-2024:1663-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2 kernel-livepatch-4.14.343-259.562 1.0-0.amzn2 ALAS2-2024-2549
Amazon Linux 2 perf +8 4.14.343-259.562.amzn2 ALAS2-2024-2549

Advisories 32

References