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CVE-2024-26845: scsi: target: core: Add TMF to tmr_list handling

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-17 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Add TMF to tmr_list handling An abort that is responded to by iSCSI itself is added to tmr_list but does not go to target core. A LUN_RESET that goes through tmr_list takes a refcounter on the abort and waits for completion. However, the abort will be never complete because it was not started in target core. Unable to locate ITT: 0x05000000 on CID: 0 Unable to locate RefTaskTag: 0x05000000 on CID: 0. wait_for_tasks: Stopping tmf LUN_RESET with tag 0x0 ref_task_tag 0x0 i_state 34 t_state ISTATE_PROCESSING refcnt 2 transport_state active,stop,fabric_stop wait for tasks: tmf LUN_RESET with tag 0x0 ref_task_tag 0x0 i_state 34 t_state ISTATE_PROCESSING refcnt 2 transport_state active,stop,fabric_stop ... INFO: task kworker/0:2:49 blocked for more than 491 seconds. task:kworker/0:2 state:D stack: 0 pid: 49 ppid: 2 flags:0x00000800 Workqueue: events target_tmr_work [target_core_mod] Call Trace: __switch_to+0x2c4/0x470 _schedule+0x314/0x1730 schedule+0x64/0x130 schedule_timeout+0x168/0x430 wait_for_completion+0x140/0x270 target_put_cmd_and_wait+0x64/0xb0 [target_core_mod] core_tmr_lun_reset+0x30/0xa0 [target_core_mod] target_tmr_work+0xc8/0x1b0 [target_core_mod] process_one_work+0x2d4/0x5d0 worker_thread+0x78/0x6c0 To fix this, only add abort to tmr_list if it will be handled by target core.

Affected products

• Debian Linux: 10.0
• Linux kernel: before 4.19.308; from 4.20 before 5.4.270; from 5.5 before 5.10.211; from 5.11 before 5.15.150; from 5.16 before 6.1.80; from 6.2 before 6.6.19 — fixed in 4.19.308, 5.10.211, 5.15.150, 5.4.270, 6.1.80, 6.6.19

How to fix

Upgrade to a fixed version: Linux kernel 4.19.308, 5.10.211, 5.15.150, 5.4.270. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/11f3fe5001ed05721e641f0ecaa7a73b7deb245d
• https://git.kernel.org/stable/c/168ed59170de1fd7274080fe102216162d6826cf
• https://git.kernel.org/stable/c/36bc5040c863b44af06094b22f1e50059227b9cb
• https://git.kernel.org/stable/c/83ab68168a3d990d5ff39ab030ad5754cbbccb25
• https://git.kernel.org/stable/c/a9849b67b4402a12eb35eadc9306c1ef9847d53d
• https://git.kernel.org/stable/c/bd508f96b5fef96d8a0ce9cbb211d82bcfc2341f
• https://git.kernel.org/stable/c/e717bd412001495f17400bfc09f606f1b594ef5a
• https://git.kernel.org/stable/c/11f3fe5001ed05721e641f0ecaa7a73b7deb245d
• https://git.kernel.org/stable/c/168ed59170de1fd7274080fe102216162d6826cf
• https://git.kernel.org/stable/c/36bc5040c863b44af06094b22f1e50059227b9cb
• https://git.kernel.org/stable/c/425a571a7e6fc389954cf2564e1edbba3740e171
• https://git.kernel.org/stable/c/83ab68168a3d990d5ff39ab030ad5754cbbccb25

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