High 7.8Published Feb 27, 2025

CVE-2025-21718net: rose: fix timer races against user threads

Updated under an hour ago (2026-10-19 09:50 UTC)

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In the Linux kernel, the following vulnerability has been resolved: net: rose: fix timer races against user threads Rose timers only acquire the socket spinlock, without checking if the socket is owned by one user thread. Add a check and rearm the timers if needed. BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174 Read of size 2 at addr ffff88802f09b82a by task swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc5-syzkaller-00172-gd1bf27c4e176 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174 call_timer_fn+0x187/0x650 kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1844 [inline] __run_timers kernel/time/timer.c:2418 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430 run_timer_base kernel/time/timer.c:2439 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ>

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 52f5aff33ca73b2c2fa93f40a3de308012e63cf4; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0d5bca3be27bfcf8f980f2fed49b6cbb7dafe4a1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1409b45d4690308c502c6caf22f01c3c205b4717; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f55c88e3ca5939a6a8a329024aed8f3d98eea8e4; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 51c128ba038cf1b79d605cbee325919b45ab95a5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1992fb261c90e9827cf5dc3115d89bb0853252c9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 58051a284ac18a3bb815aac6289a679903ddcc3f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5de7665e0a0746b5ad7943554b34db8f8614a196	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12 before 6.1.129; from 6.2 before 6.6.76; from 6.7 before 6.12.13; from 6.13 before 6.13.2	NVD

References

https://git.kernel.org/stable/c/52f5aff33ca73b2c2fa93f40a3de308012e63cf4
https://git.kernel.org/stable/c/0d5bca3be27bfcf8f980f2fed49b6cbb7dafe4a1
https://git.kernel.org/stable/c/1409b45d4690308c502c6caf22f01c3c205b4717
https://git.kernel.org/stable/c/f55c88e3ca5939a6a8a329024aed8f3d98eea8e4patch
https://git.kernel.org/stable/c/51c128ba038cf1b79d605cbee325919b45ab95a5patch
https://git.kernel.org/stable/c/1992fb261c90e9827cf5dc3115d89bb0853252c9patch
https://git.kernel.org/stable/c/58051a284ac18a3bb815aac6289a679903ddcc3fpatch
https://git.kernel.org/stable/c/5de7665e0a0746b5ad7943554b34db8f8614a196patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.