cbcvebase.
CVE-2023-53291
published 2025-09-16

CVE-2023-53291: In the Linux kernel, the following vulnerability has been resolved: rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale Running the…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.14%
3.4th percentile
In the Linux kernel, the following vulnerability has been resolved: rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale Running the 'kfree_rcu_test' test case [1] results in a splat [2]. The root cause is the kfree_scale_thread thread(s) continue running after unloading the rcuscale module. This commit fixes that isue by invoking kfree_scale_cleanup() from rcu_scale_cleanup() when removing the rcuscale module. [1] modprobe rcuscale kfree_rcu_test=1 // After some time rmmod rcuscale rmmod torture [2] BUG: unable to handle page fault for address: ffffffffc0601a87 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 11de4f067 P4D 11de4f067 PUD 11de51067 PMD 112f4d067 PTE 0 Oops: 0010 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 1798 Comm: kfree_scale_thr Not tainted 6.3.0-rc1-rcu+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 RIP: 0010:0xffffffffc0601a87 Code: Unable to access opcode bytes at 0xffffffffc0601a5d. RSP: 0018:ffffb25bc2e57e18 EFLAGS: 00010297 RAX: 0000000000000000 RBX: ffffffffc061f0b6 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff962fd0de RDI: ffffffff962fd0de RBP: ffffb25bc2e57ea8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 000000000000000a R15: 00000000001c1dbe FS: 0000000000000000(0000) GS:ffff921fa2200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc0601a5d CR3: 000000011de4c006 CR4: 0000000000370ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? kvfree_call_rcu+0xf0/0x3a0 ? kthread+0xf3/0x120 ? kthread_complete_and_exit+0x20/0x20 ? ret_from_fork+0x1f/0x30 Modules linked in: rfkill sunrpc ... [last unloaded: torture] CR2: ffffffffc0601a87 ---[ end trace 0000000000000000 ]---

Affected

17 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.52-1 (bookworm)linux 6.1.52-1 (bookworm)
linuxlinux——
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < 604d6a5ff718874904b0fe614878a42b42c0d699604d6a5ff718874904b0fe614878a42b42c0d699
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < f766d45ab294871a3d588ee76c666852f151cad9f766d45ab294871a3d588ee76c666852f151cad9
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < b8a6ba524d41f4da102e65f90498d9a910839621b8a6ba524d41f4da102e65f90498d9a910839621
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < 1dd7547c7610723b2b6afe1a3c4ddb2bde63387c1dd7547c7610723b2b6afe1a3c4ddb2bde63387c
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < 29b1da4f90fc42c91beb4e400d926194925ad31b29b1da4f90fc42c91beb4e400d926194925ad31b
linuxlinux>= e6e78b004fa7e0ab455d46d27f218bf6ce178a18 < 23fc8df26dead16687ae6eb47b0561a4a832e2f623fc8df26dead16687ae6eb47b0561a4a832e2f6
linuxlinux_kernel>= 0 < 5.10.191-15.10.191-1
linuxlinux_kernel>= 0 < 6.1.52-16.1.52-1
linuxlinux_kernel>= 0 < 6.4.4-16.4.4-1
linuxlinux_kernel>= 0 < 6.4.4-16.4.4-1
linuxlinux_kernel>= 5.11 < 5.15.1215.15.121
linuxlinux_kernel>= 5.16 < 6.1.396.1.39
linuxlinux_kernel>= 5.6 < 5.10.1885.10.188
linuxlinux_kernel>= 6.2 < 6.3.136.3.13
linuxlinux_kernel>= 6.4 < 6.4.46.4.4

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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