CVE-2023-54246 | THREATINT

Description

In the Linux kernel, the following vulnerability has been resolved: rcuscale: Move rcu_scale_writer() schedule_timeout_uninterruptible() to _idle() The rcuscale.holdoff module parameter can be used to delay the start of rcu_scale_writer() kthread. However, the hung-task timeout will trigger when the timeout specified by rcuscale.holdoff is greater than hung_task_timeout_secs: runqemu kvm nographic slirp qemuparams="-smp 4 -m 2048M" bootparams="rcuscale.shutdown=0 rcuscale.holdoff=300" [ 247.071753] INFO: task rcu_scale_write:59 blocked for more than 122 seconds. [ 247.072529] Not tainted 6.4.0-rc1-00134-gb9ed6de8d4ff #7 [ 247.073400] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 247.074331] task:rcu_scale_write state:D stack:30144 pid:59 ppid:2 flags:0x00004000 [ 247.075346] Call Trace: [ 247.075660] <TASK> [ 247.075965] __schedule+0x635/0x1280 [ 247.076448] ? __pfx___schedule+0x10/0x10 [ 247.076967] ? schedule_timeout+0x2dc/0x4d0 [ 247.077471] ? __pfx_lock_release+0x10/0x10 [ 247.078018] ? enqueue_timer+0xe2/0x220 [ 247.078522] schedule+0x84/0x120 [ 247.078957] schedule_timeout+0x2e1/0x4d0 [ 247.079447] ? __pfx_schedule_timeout+0x10/0x10 [ 247.080032] ? __pfx_rcu_scale_writer+0x10/0x10 [ 247.080591] ? __pfx_process_timeout+0x10/0x10 [ 247.081163] ? __pfx_sched_set_fifo_low+0x10/0x10 [ 247.081760] ? __pfx_rcu_scale_writer+0x10/0x10 [ 247.082287] rcu_scale_writer+0x6b1/0x7f0 [ 247.082773] ? mark_held_locks+0x29/0xa0 [ 247.083252] ? __pfx_rcu_scale_writer+0x10/0x10 [ 247.083865] ? __pfx_rcu_scale_writer+0x10/0x10 [ 247.084412] kthread+0x179/0x1c0 [ 247.084759] ? __pfx_kthread+0x10/0x10 [ 247.085098] ret_from_fork+0x2c/0x50 [ 247.085433] </TASK> This commit therefore replaces schedule_timeout_uninterruptible() with schedule_timeout_idle().

PUBLISHED Reserved 2025-12-30 | Published 2025-12-30 | Updated 2025-12-30 | Assigner Linux

Product status

Default status

unaffected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 55887adc76e19aec9763186e2c1d0a3481d20e96

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 4f03fba096bfded90e0d71eba8839a46922164d1

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 83ed0cdb6ae0383dd14b02375c353773836884ed

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 9416dccb31fdb190d25d57e97674f232651f6560

affected

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before e60c122a1614b4f65b29a7bef9d83b9fd30e937a

affected

Default status

affected

5.10.197 (semver)

unaffected

5.15.133 (semver)

unaffected

6.1.55 (semver)

unaffected

6.5.5 (semver)

unaffected

6.6 (original_commit_for_fix)

unaffected

References

git.kernel.org/...c/55887adc76e19aec9763186e2c1d0a3481d20e96

git.kernel.org/...c/4f03fba096bfded90e0d71eba8839a46922164d1

git.kernel.org/...c/83ed0cdb6ae0383dd14b02375c353773836884ed

git.kernel.org/...c/9416dccb31fdb190d25d57e97674f232651f6560

git.kernel.org/...c/e60c122a1614b4f65b29a7bef9d83b9fd30e937a

cve.org (CVE-2023-54246)

nvd.nist.gov (CVE-2023-54246)

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