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CVE-2024-38604: block: refine the EOF check in blkdev_iomap_begin

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-19 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: block: refine the EOF check in blkdev_iomap_begin blkdev_iomap_begin rounds down the offset to the logical block size before stashing it in iomap->offset and checking that it still is inside the inode size. Check the i_size check to the raw pos value so that we don't try a zero size write if iter->pos is unaligned.

Affected products

• Linux kernel: from 6.6 before 6.6.33; from 6.7 before 6.8.12; from 6.9 before 6.9.3 — fixed in 6.6.33, 6.8.12, 6.9.3

How to fix

Upgrade to a fixed version: Linux kernel 6.6.33, 6.8.12, 6.9.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0c12028aec837f5a002009bbf68d179d506510e8
• https://git.kernel.org/stable/c/10b723bcba8986537a484aa94dbfc9093fd776a1
• https://git.kernel.org/stable/c/72c54e063c32aeb38d43a2bd897821e6e5a1757d
• https://git.kernel.org/stable/c/910717920c8c3f9386277a44c44d448058a18084
• https://git.kernel.org/stable/c/0c12028aec837f5a002009bbf68d179d506510e8
• https://git.kernel.org/stable/c/10b723bcba8986537a484aa94dbfc9093fd776a1
• https://git.kernel.org/stable/c/72c54e063c32aeb38d43a2bd897821e6e5a1757d
• https://git.kernel.org/stable/c/910717920c8c3f9386277a44c44d448058a18084

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