CVE-2025-68745
Unknown Unknown - Not Provided
Race Condition and Command Hang in Linux qla2xxx SCSI Driver

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Clear cmds after chip reset Commit aefed3e5548f ("scsi: qla2xxx: target: Fix offline port handling and host reset handling") caused two problems: 1. Commands sent to FW, after chip reset got stuck and never freed as FW is not going to respond to them anymore. 2. BUG_ON(cmd->sg_mapped) in qlt_free_cmd(). Commit 26f9ce53817a ("scsi: qla2xxx: Fix missed DMA unmap for aborted commands") attempted to fix this, but introduced another bug under different circumstances when two different CPUs were racing to call qlt_unmap_sg() at the same time: BUG_ON(!valid_dma_direction(dir)) in dma_unmap_sg_attrs(). So revert "scsi: qla2xxx: Fix missed DMA unmap for aborted commands" and partially revert "scsi: qla2xxx: target: Fix offline port handling and host reset handling" at __qla2x00_abort_all_cmds.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-05-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-05-05
NVD
CVE-2025-68745
EUVD
EUVD-2025-205217
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability involves the Linux kernel's scsi qla2xxx driver where commands sent to firmware after a chip reset get stuck and are never freed because the firmware no longer responds to them. Additionally, attempts to fix this issue introduced a race condition between CPUs that could cause a bug during DMA unmapping of aborted commands. The fix involved reverting problematic commits to properly clear commands after a chip reset and avoid these bugs.


How can this vulnerability impact me? :

The vulnerability can cause commands to become stuck and never freed after a chip reset, potentially leading to resource leaks or system instability. The race condition in DMA unmapping could cause kernel bugs or crashes under certain CPU concurrency scenarios, impacting system reliability.


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