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In the Linux kernel, the following vulnerability has been resolved:
md: Replace snprintf with scnprintf
Current code produces a warning as shown below when total characters in the constituent block device names plus the slashes exceeds 200. snprintf() returns the number of characters generated from the given input, which could cause the expression “200 – len” to wrap around to a large positive number. Fix this by using scnprintf() instead, which returns the actual number of characters written into the buffer.
[ 1513.267938] ------------[ cut here ]------------ [ 1513.267943] WARNING: CPU: 15 PID: 37247 at <snip>/lib/vsprintf.c:2509 vsnprintf+0x2c8/0x510 [ 1513.267944] Modules linked in: <snip> [ 1513.267969] CPU: 15 PID: 37247 Comm: mdadm Not tainted 5.4.0-1085-azure #90~18.04.1-Ubuntu [ 1513.267969] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 1513.267971] RIP: 0010:vsnprintf+0x2c8/0x510 <-snip-> [ 1513.267982] Call Trace: [ 1513.267986] snprintf+0x45/0x70 [ 1513.267990] ? disk_name+0x71/0xa0 [ 1513.267993] dump_zones+0x114/0x240 [raid0] [ 1513.267996] ? _cond_resched+0x19/0x40 [ 1513.267998] raid0_run+0x19e/0x270 [raid0] [ 1513.268000] md_run+0x5e0/0xc50 [ 1513.268003] ? security_capable+0x3f/0x60 [ 1513.268005] do_md_run+0x19/0x110 [ 1513.268006] md_ioctl+0x195e/0x1f90 [ 1513.268007] blkdev_ioctl+0x91f/0x9f0 [ 1513.268010] block_ioctl+0x3d/0x50 [ 1513.268012] do_vfs_ioctl+0xa9/0x640 [ 1513.268014] ? __fput+0x162/0x260 [ 1513.268016] ksys_ioctl+0x75/0x80 [ 1513.268017] __x64_sys_ioctl+0x1a/0x20 [ 1513.268019] do_syscall_64+0x5e/0x200 [ 1513.268021] entry_SYSCALL_64_after_hwframe+0x44/0xa9
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.15.75-48.135Upgrade bpftoolUpgrade perf-debuginfoUpgrade kernel-livepatch-4.14.296-222.539Upgrade perfUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade python-perfUpgrade kernel-livepatch-5.10.155-138.670Upgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade kernel-develUpgrade kernel-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelists | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-realtimeUpgrade linux-gkeUpgrade linux-azure-fdeUpgrade linux-aws-5.15Upgrade linux-oracle-5.15Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-riscv-5.15Upgrade linux-fipsUpgrade linuxUpgrade linux-ibm-5.4Upgrade linux-aws-hweUpgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-raspiUpgrade linux-raspi-5.4Upgrade linux-lowlatencyUpgrade linux-lowlatency-hwe-5.15Upgrade linux-iotUpgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-hweUpgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-azure-4.15Upgrade linux-gcp-5.15Upgrade linux-azure-5.15Upgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-azureUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-gkeopUpgrade linux-gcp-4.15Upgrade linux-gcp-fipsUpgrade linux-gcp-5.4Upgrade linux-azure-5.4Upgrade linux-azure-fips | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Sep 15, 2025 |
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