CVE-2024-46735

ublk_drv: fix NULL pointer dereference in ublk_ctrl_start_recovery()

MEDIUM

5.5

CVSS Score

Published: September 18, 2024 at 07:11 AM UTC

Updated: June 17, 2026 at 07:55 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

6.1 ≤ v < 6.1.1106.1 ≤ v < 6.10.106.1 ≤ v < 6.116.1 ≤ v < 6.6.516.2 ≤ v < 6.6.516.7 ≤ v < 6.10.106.11 rc1 6.11 rc2 6.11 rc3 6.11 rc4 6.11 rc5 6.11 rc6c732a852b419fa057b53657e2daaf9433940391c

Vendor states this is fixed in 136a29d8112df4ea0a57f9602ddf3579e04089dc (fixed)

Vendor states this is fixed in 7c890ef60bf417d3fe5c6f7a9f6cef0e1d77f74f (fixed)

Vendor states this is fixed in ca249435893dda766f3845c15ca77ca5672022d8 (fixed)

Vendor states this is fixed in e58f5142f88320a5b1449f96a146f2f24615c5c7 (fixed)

Vendor states this is fixed in 6.1 (unaffected)

Vendor states this is fixed in 6.1.110 (unaffected)

Vendor states this is fixed in 6.10.10 (unaffected)

Vendor states this is fixed in 6.11 (unaffected)

Vendor states this is fixed in 6.6.51 (unaffected)