Riskcovery

CVE-2024-46735

ublk_drv: fix NULL pointer dereference in ublk_ctrl_start_recovery()

State
Published
Severity
Not scored
Published
Sep 18, 2024
Updated
May 11, 2026
Reserved
Sep 11, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

ublk_drv: fix NULL pointer dereference in ublk_ctrl_start_recovery()

When two UBLK_CMD_START_USER_RECOVERY commands are submitted, the first one sets 'ubq->ubq_daemon' to NULL, and the second one triggers WARN in ublk_queue_reinit() and subsequently a NULL pointer dereference issue.

Fix it by adding the check in ublk_ctrl_start_recovery() and return immediately in case of zero 'ub->nr_queues_ready'.

BUG: kernel NULL pointer dereference, address: 0000000000000028 RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x82/0x180 Call Trace: <TASK> ? __die+0x20/0x70 ? page_fault_oops+0x75/0x170 ? exc_page_fault+0x64/0x140 ? asm_exc_page_fault+0x22/0x30 ? ublk_ctrl_start_recovery.constprop.0+0x82/0x180 ublk_ctrl_uring_cmd+0x4f7/0x6c0 ? pick_next_task_idle+0x26/0x40 io_uring_cmd+0x9a/0x1b0 io_issue_sqe+0x193/0x3f0 io_wq_submit_work+0x9b/0x390 io_worker_handle_work+0x165/0x360 io_wq_worker+0xcb/0x2f0 ? finish_task_switch.isra.0+0x203/0x290 ? finish_task_switch.isra.0+0x203/0x290 ? __pfx_io_wq_worker+0x10/0x10 ret_from_fork+0x2d/0x50 ? __pfx_io_wq_worker+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK>

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • c732a852b419fa057b53657e2daaf9433940391c to before ca249435893dda766f3845c15ca77ca5672022d8Affected
  • c732a852b419fa057b53657e2daaf9433940391c to before 136a29d8112df4ea0a57f9602ddf3579e04089dcAffected
  • c732a852b419fa057b53657e2daaf9433940391c to before 7c890ef60bf417d3fe5c6f7a9f6cef0e1d77f74fAffected
  • c732a852b419fa057b53657e2daaf9433940391c to before e58f5142f88320a5b1449f96a146f2f24615c5c7Affected
LinuxLinux
  • 6.1Affected
  • before 6.1Not affected
  • 6.1.110 through 6.1.*Not affected
  • 6.6.51 through 6.6.*Not affected
  • 6.10.10 through 6.10.*Not affected
  • 6.11 and laterNot affected

References

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