What’s Vulnerable › Vulnerabilities

CVE-2024-26632: block: Fix iterating over an empty bio with bio_for_each_folio_all

• 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: 2024-03-18 · updated 2026-08-04
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: block: Fix iterating over an empty bio with bio_for_each_folio_all If the bio contains no data, bio_first_folio() calls page_folio() on a NULL pointer and oopses. Move the test that we've reached the end of the bio from bio_next_folio() to bio_first_folio(). [axboe: add unlikely() to error case]

Affected products

• Linux kernel: from 5.17 before 6.1.75; from 6.2 before 6.6.14; from 6.7 before 6.7.2 — fixed in 6.1.75, 6.6.14, 6.7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.1.75, 6.6.14, 6.7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7
• https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659
• https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe
• https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde
• https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7
• https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659
• https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe
• https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde

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