{"id":"CVE-2023-53291","summary":"rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale\n\nRunning the 'kfree_rcu_test' test case [1] results in a splat [2].\nThe root cause is the kfree_scale_thread thread(s) continue running\nafter unloading the rcuscale module.  This commit fixes that isue by\ninvoking kfree_scale_cleanup() from rcu_scale_cleanup() when removing\nthe rcuscale module.\n\n[1] modprobe rcuscale kfree_rcu_test=1\n    // After some time\n    rmmod rcuscale\n    rmmod torture\n\n[2] BUG: unable to handle page fault for address: ffffffffc0601a87\n    #PF: supervisor instruction fetch in kernel mode\n    #PF: error_code(0x0010) - not-present page\n    PGD 11de4f067 P4D 11de4f067 PUD 11de51067 PMD 112f4d067 PTE 0\n    Oops: 0010 [#1] PREEMPT SMP NOPTI\n    CPU: 1 PID: 1798 Comm: kfree_scale_thr Not tainted 6.3.0-rc1-rcu+ #1\n    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015\n    RIP: 0010:0xffffffffc0601a87\n    Code: Unable to access opcode bytes at 0xffffffffc0601a5d.\n    RSP: 0018:ffffb25bc2e57e18 EFLAGS: 00010297\n    RAX: 0000000000000000 RBX: ffffffffc061f0b6 RCX: 0000000000000000\n    RDX: 0000000000000000 RSI: ffffffff962fd0de RDI: ffffffff962fd0de\n    RBP: ffffb25bc2e57ea8 R08: 0000000000000000 R09: 0000000000000000\n    R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000\n    R13: 0000000000000000 R14: 000000000000000a R15: 00000000001c1dbe\n    FS:  0000000000000000(0000) GS:ffff921fa2200000(0000) knlGS:0000000000000000\n    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n    CR2: ffffffffc0601a5d CR3: 000000011de4c006 CR4: 0000000000370ee0\n    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n    Call Trace:\n     \u003cTASK\u003e\n     ? kvfree_call_rcu+0xf0/0x3a0\n     ? kthread+0xf3/0x120\n     ? kthread_complete_and_exit+0x20/0x20\n     ? ret_from_fork+0x1f/0x30\n     \u003c/TASK\u003e\n    Modules linked in: rfkill sunrpc ... [last unloaded: torture]\n    CR2: ffffffffc0601a87\n    ---[ end trace 0000000000000000 ]---","modified":"2026-04-02T09:43:56.331171Z","published":"2025-09-16T08:11:23.666Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:3751-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4141-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53291.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1dd7547c7610723b2b6afe1a3c4ddb2bde63387c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/23fc8df26dead16687ae6eb47b0561a4a832e2f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29b1da4f90fc42c91beb4e400d926194925ad31b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/604d6a5ff718874904b0fe614878a42b42c0d699"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8a6ba524d41f4da102e65f90498d9a910839621"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f766d45ab294871a3d588ee76c666852f151cad9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53291.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53291"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e6e78b004fa7e0ab455d46d27f218bf6ce178a18"},{"fixed":"604d6a5ff718874904b0fe614878a42b42c0d699"},{"fixed":"f766d45ab294871a3d588ee76c666852f151cad9"},{"fixed":"b8a6ba524d41f4da102e65f90498d9a910839621"},{"fixed":"1dd7547c7610723b2b6afe1a3c4ddb2bde63387c"},{"fixed":"29b1da4f90fc42c91beb4e400d926194925ad31b"},{"fixed":"23fc8df26dead16687ae6eb47b0561a4a832e2f6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53291.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}