CVE-2025-37931 — btrfs: adjust subpage bit start based on sectorsize

Affected: Linux, Siemens SIMATIC CN 4100

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

btrfs: adjust subpage bit start based on sectorsize

When running machines with 64k page size and a 16k nodesize we started seeing tree log corruption in production. This turned out to be because we were not writing out dirty blocks sometimes, so this in fact affects all metadata writes.

When writing out a subpage EB we scan the subpage bitmap for a dirty range. If the range isn't dirty we do

bit_start++;

to move onto the next bit. The problem is the bitmap is based on the number of sectors that an EB has. So in this case, we have a 64k pagesize, 16k nodesize, but a 4k sectorsize. This means our bitmap is 4 bits for every node. With a 64k page size we end up with 4 nodes per page.

To make this easier this is how everything looks

[0 16k 32k 48k ] logical address [0 4 8 12 ] radix tree offset [ 64k page ] folio [ 16k eb ][ 16k eb ][ 16k eb ][ 16k eb ] extent buffers [ | | | | | | | | | | | | | | | | ] bitmap

Now we use all of our addressing based on fs_info->sectorsize_bits, so as you can see the above our 16k eb->start turns into radix entry 4.

When we find a dirty range for our eb, we correctly do bit_start += sectors_per_node, because if we start at bit 0, the next bit for the next eb is 4, to correspond to eb->start 16k.

However if our range is clean, we will do bit_start++, which will now put us offset fr…

USN-7649-1 — linux, linux-gcp, linux-raspi, linux-realtime vulnerabilities

Affected: Ubuntu:25.04: linux, Ubuntu:25.04: linux-gcp, Ubuntu:25.04: linux-raspi, Ubuntu:25.04: linux-realtime

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - PA-RISC architecture; - PowerPC architecture; - S390 architecture; - x86 architecture; - Compute Acceleration Framework; - Ublk userspace block driver; - Bluetooth drivers; - ARM SCMI message protocol; - GPU drivers; - IOMMU subsystem; - IRQ chip drivers; - Multiple devices driver; - Network drivers; - PCI subsystem; - PTP clock framework; - SPI subsystem; - BTRFS file system; - SMB network file system; - eXpress Data Path; - Universal MIDI packet (UMP) support module; - Tracing infrastructure; - Memory management; - IPv4 networking; - IPv6 networking; - Network traffic control; - AMD SoC Alsa drivers; - SoC Audio generic drivers; (CVE-2025-37898, CVE-2025-37990, CVE-2025-37974, CVE-2025-37991, CVE-2025-37894, CVE-2025-37906, CVE-2025-37896, CVE-2025-37909, CVE-2025-37923, CVE-2025-37899, CVE-2025-37901, CVE-2025-37914, CVE-2025-38216, CVE-2025-37931, CVE-2025-37928, CVE-2025-37916, CVE-2025-37908, CVE-2025-37915, CVE-2025-37917, CVE-2025-37921, CVE-2025-37903, CVE-2025-37922, CVE-2025-37895, CVE-2025-37936, CVE-2025-37933, CVE-2025-37891, CVE-2025-37926, CVE-2025-37912, CVE-2025-37920, CVE-2025-37924, CVE-2025-37927, CVE-2025-37946, CVE-2025-37907, CVE-2025-37930, CVE-2025-37911, CVE-2025-37905, CVE-2025-37900, CVE-202…

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CVE-2025-37931 — btrfs: adjust subpage bit start based on sectorsize

USN-7649-1 — linux, linux-gcp, linux-raspi, linux-realtime vulnerabilities