CVE-2026-90188

Summary

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).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 0b2faa330184340d9418ad2c627c2ae881772e33affected
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 665c94554ff0d5d88caae7f40c16c8e0a3369edaaffected
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 2882e1450fa4597811a951196e07553ea134eb31affected
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 2b59484ac1e64dd78dbe8c6140891c6308085a75affected
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 081cf37e8a0e00cd91d6df53172c9d928790a798affected
LinuxLinux82f402fefa50f1675bf918bcd009981bd6b30ac8 < 5a1c5ff3a49ba93a1fd0b70537e7a0164071760daffected
LinuxLinux4.13affected
LinuxLinux0 < 4.13unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References