What’s Vulnerable › Vulnerabilities

CVE-2026-90434: isofs: release zisofs block pointer buffer head

• 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: isofs: release zisofs block pointer buffer head zisofs_fill_pages() reads the compressed block pointer table. The error paths release the current buffer_head, the loop also releases the old buffer_head when it advances. However, the success path leaves the last buffer_head referenced. Release it before returning success.

Affected products

• Linux kernel: 2.6.33 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0c2c54a7d174edc845f7bae24179fe72a926d10f
• https://git.kernel.org/stable/c/106e1a3b2b3454fbda63a59e9290cb9a253f81aa
• https://git.kernel.org/stable/c/2f7dd9b86fe4076059e6a4a2a2c5d565afd76b9e
• https://git.kernel.org/stable/c/3371d30a97a257b7b5f2c8009612e9d452180f0a
• https://git.kernel.org/stable/c/5677737c2cedf417c0fcf61540b9cef0e62273d4
• https://git.kernel.org/stable/c/dbcc7d1b818162aeab2e97fd217d86546d9fde15
• https://git.kernel.org/stable/c/ec33e6b7a1de20d7e623b12633191a855445657d
• https://git.kernel.org/stable/c/f2a1611065c700a374b31c5cc8a7587f5e3bfe73

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