{"id":"CVE-2025-21718","summary":"net: rose: fix timer races against user threads","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rose: fix timer races against user threads\n\nRose timers only acquire the socket spinlock, without\nchecking if the socket is owned by one user thread.\n\nAdd a check and rearm the timers if needed.\n\nBUG: KASAN: slab-use-after-free in rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174\nRead of size 2 at addr ffff88802f09b82a by task swapper/0/0\n\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc5-syzkaller-00172-gd1bf27c4e176 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nCall Trace:\n \u003cIRQ\u003e\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n  print_address_description mm/kasan/report.c:378 [inline]\n  print_report+0x169/0x550 mm/kasan/report.c:489\n  kasan_report+0x143/0x180 mm/kasan/report.c:602\n  rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174\n  call_timer_fn+0x187/0x650 kernel/time/timer.c:1793\n  expire_timers kernel/time/timer.c:1844 [inline]\n  __run_timers kernel/time/timer.c:2418 [inline]\n  __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430\n  run_timer_base kernel/time/timer.c:2439 [inline]\n  run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449\n  handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561\n  __do_softirq kernel/softirq.c:595 [inline]\n  invoke_softirq kernel/softirq.c:435 [inline]\n  __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662\n  irq_exit_rcu+0x9/0x30 kernel/softirq.c:678\n  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]\n  sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049\n \u003c/IRQ\u003e","modified":"2026-03-20T12:41:07.487318Z","published":"2025-02-27T02:07:27.971Z","related":["SUSE-SU-2025:01919-1","SUSE-SU-2025:0983-1","SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1177-1","SUSE-SU-2025:1178-1","SUSE-SU-2025:1180-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1241-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1","SUSE-SU-2026:0385-1","USN-7521-2"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21718.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d5bca3be27bfcf8f980f2fed49b6cbb7dafe4a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1409b45d4690308c502c6caf22f01c3c205b4717"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1992fb261c90e9827cf5dc3115d89bb0853252c9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51c128ba038cf1b79d605cbee325919b45ab95a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52f5aff33ca73b2c2fa93f40a3de308012e63cf4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58051a284ac18a3bb815aac6289a679903ddcc3f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5de7665e0a0746b5ad7943554b34db8f8614a196"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f55c88e3ca5939a6a8a329024aed8f3d98eea8e4"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21718.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21718"},{"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":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"52f5aff33ca73b2c2fa93f40a3de308012e63cf4"},{"fixed":"0d5bca3be27bfcf8f980f2fed49b6cbb7dafe4a1"},{"fixed":"1409b45d4690308c502c6caf22f01c3c205b4717"},{"fixed":"f55c88e3ca5939a6a8a329024aed8f3d98eea8e4"},{"fixed":"51c128ba038cf1b79d605cbee325919b45ab95a5"},{"fixed":"1992fb261c90e9827cf5dc3115d89bb0853252c9"},{"fixed":"58051a284ac18a3bb815aac6289a679903ddcc3f"},{"fixed":"5de7665e0a0746b5ad7943554b34db8f8614a196"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21718.json"}}],"schema_version":"1.7.5"}