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Vulnerability · Published Apr 3, 2024 · Assigned by Linux

CVE-2024-26685nilfs2: fix potential bug in end_buffer_async_write

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 83.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.82-1DEBIAN-CVE-2024-26685
Debian:13linux6.7.7-1DEBIAN-CVE-2024-26685
Debian:14linux6.7.7-1DEBIAN-CVE-2024-26685
Ubuntu:22.04:LTSlinux5.15.0-106.116UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-aws5.15.0-1061.67UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-aws-6.56.5.0-1023.23~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-aws-6.56.5.0-1023.23~22.04.1USN-6895-3
Ubuntu:22.04:LTSlinux-azure5.15.0-1063.72UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-6.56.5.0-1024.25~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-6.56.5.0-1024.25~22.04.1USN-6895-2
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1063.72.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gcp5.15.0-1059.67UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gcp-6.56.5.0-1024.26~22.04.1USN-6895-2
Ubuntu:22.04:LTSlinux-gcp-6.56.5.0-1024.26~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gke5.15.0-1058.63UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1044.51UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-hwe-6.56.5.0-44.44~22.04.1USN-6900-1
Ubuntu:22.04:LTSlinux-hwe-6.56.5.0-44.44~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-ibm5.15.0-1054.57UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1057.63UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-kvm5.15.0-1058.63UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-106.116UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.56.5.0-44.44.1~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.56.5.0-44.44.1~22.04.1USN-6895-3
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1054.55UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-nvidia-6.56.5.0-1023.24USN-6895-1
Ubuntu:22.04:LTSlinux-nvidia-6.56.5.0-1023.24UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1026.26UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1015.15UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oem-6.56.5.0-1027.28USN-6895-4
Ubuntu:22.04:LTSlinux-oem-6.56.5.0-1027.28UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oracle5.15.0-1059.65UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oracle-6.56.5.0-1026.26~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-oracle-6.56.5.0-1026.26~22.04.1USN-6895-3
Ubuntu:22.04:LTSlinux-raspi5.15.0-1054.57UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-starfive-6.56.5.0-1017.18~22.04.1USN-6895-3
Ubuntu:22.04:LTSlinux-starfive-6.56.5.0-1017.18~22.04.1UBUNTU-CVE-2024-26685
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1030.34UBUNTU-CVE-2024-26685

Affected products (as reported)

VendorProductVersions
Linux Linux 7f42ec3941560f0902fe3671e36f2c20ffd3af0a – before c4a09fdac625e64abe478dcf88bfa204066169287f42ec3941560f0902fe3671e36f2c20ffd3af0a – before d31c8721e816eff5ca6573cc487754f357c093cd7f42ec3941560f0902fe3671e36f2c20ffd3af0a – before f3e4963566f58726d3265a727116a42b591f65967f42ec3941560f0902fe3671e36f2c20ffd3af0a – before 8fa90634ec3e9cc50f42dd605eec60f2d146ced87f42ec3941560f0902fe3671e36f2c20ffd3af0a – before 6589f0f72f8edd1fa11adce4eedbd3615f2e78ab7f42ec3941560f0902fe3671e36f2c20ffd3af0a – before 2c3bdba00283a6c7a5b19481a59a730f460638037f42ec3941560f0902fe3671e36f2c20ffd3af0a – before 626daab3811b772086aef1bf8eed3ffe6f523eff7f42ec3941560f0902fe3671e36f2c20ffd3af0a – before 5bc09b397cbf1221f8a8aacb1152650c9195b02b
Linux Linux 3.12

References