null_blk: free global tag_set on init error path

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).

Timeline

1. Sep 17, 2026, 4:07 PM UTCCVE published
2. Oct 19, 2026, 8:59 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 0b2faa330184340d9418ad2c627c2ae881772e33; From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 665c94554ff0d5d88caae7f40c16c8e0a3369eda; From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 2882e1450fa4597811a951196e07553ea134eb31; From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 2b59484ac1e64dd78dbe8c6140891c6308085a75; From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 081cf37e8a0e00cd91d6df53172c9d928790a798; From 82f402fefa50f1675bf918bcd009981bd6b30ac8 · fixed in 5a1c5ff3a49ba93a1fd0b70537e7a0164071760d

• Linux Linux

  4.13

• KernelLinux

  From 4.13.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 6