CVE-2026-90188

Description

In the Linux kernel, the following vulnerability has been resolved: null_blk: free global tag_set on init error path If shared_tags is enabled, null_setup_tagset() allocates the global tag_set via null_init_global_tag_set(). If device creation later fails, err_dev destroys the default devices and calls unregister_blkdev(), but never frees the global tag_set. Since module init failed, null_exit() is never invoked, so the global tag_set's tags and maps are permanently leaked. Free the global tag_set in err_dev, matching null_exit() which does if (tag_set.ops) blk_mq_free_tag_set(&tag_set).

References

• https://git.kernel.org/stable/c/081cf37e8a0e00cd91d6df53172c9d928790a798
• https://git.kernel.org/stable/c/0b2faa330184340d9418ad2c627c2ae881772e33
• https://git.kernel.org/stable/c/2882e1450fa4597811a951196e07553ea134eb31
• https://git.kernel.org/stable/c/2b59484ac1e64dd78dbe8c6140891c6308085a75
• https://git.kernel.org/stable/c/5a1c5ff3a49ba93a1fd0b70537e7a0164071760d