What’s Vulnerable › Vulnerabilities

CVE-2025-68348: block: fix memory leak in __blkdev_issue_zero_pages

• Severity: unknown
• 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: 2025-12-24 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: block: fix memory leak in __blkdev_issue_zero_pages Move the fatal signal check before bio_alloc() to prevent a memory leak when BLKDEV_ZERO_KILLABLE is set and a fatal signal is pending. Previously, the bio was allocated before checking for a fatal signal. If a signal was pending, the code would break out of the loop without freeing or chaining the just-allocated bio, causing a memory leak. This matches the pattern already used in __blkdev_issue_write_zeroes() where the signal check precedes the allocation.

Affected products

• Linux kernel: 6.11 — fixed in 6.19

How to fix

Upgrade to a fixed version: Linux kernel 6.19. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/453e4b0c84d0db1454ff0adf655d91179e6fca3a
• https://git.kernel.org/stable/c/7193407bc4457212fa38ec3aff9c640e63a8dbef
• https://git.kernel.org/stable/c/7957635c679e8a01147163a3a4a1f16e1210fa03
• https://git.kernel.org/stable/c/f7e3f852a42d7cd8f1af2c330d9d153e30c8adcf

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