{"id":"DEBIAN-CVE-2023-53291","details":"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:      \u003cTASK\u003e      ? kvfree_call_rcu+0xf0/0x3a0      ? kthread+0xf3/0x120      ? kthread_complete_and_exit+0x20/0x20      ? ret_from_fork+0x1f/0x30      \u003c/TASK\u003e     Modules linked in: rfkill sunrpc ... [last unloaded: torture]     CR2: ffffffffc0601a87     ---[ end trace 0000000000000000 ]---","modified":"2026-09-15T09:02:54.013039107Z","published":"2025-09-16T08:15:38.313Z","upstream":["CVE-2023-53291"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53291"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.52-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53291.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53291.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53291.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}