{"id":"DEBIAN-CVE-2024-40981","details":"In the Linux kernel, the following vulnerability has been resolved:  batman-adv: bypass empty buckets in batadv_purge_orig_ref()  Many syzbot reports are pointing to soft lockups in batadv_purge_orig_ref() [1]  Root cause is unknown, but we can avoid spending too much time there and perhaps get more interesting reports.  [1]  watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u4:6:621] Modules linked in: irq event stamp: 6182794  hardirqs last  enabled at (6182793): [\u003cffff8000801dae10\u003e] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386  hardirqs last disabled at (6182794): [\u003cffff80008ad66a78\u003e] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]  hardirqs last disabled at (6182794): [\u003cffff80008ad66a78\u003e] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551  softirqs last  enabled at (6182792): [\u003cffff80008aab71c4\u003e] spin_unlock_bh include/linux/spinlock.h:396 [inline]  softirqs last  enabled at (6182792): [\u003cffff80008aab71c4\u003e] batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287  softirqs last disabled at (6182790): [\u003cffff80008aab61dc\u003e] spin_lock_bh include/linux/spinlock.h:356 [inline]  softirqs last disabled at (6182790): [\u003cffff80008aab61dc\u003e] batadv_purge_orig_ref+0x164/0x1228 net/batman-adv/originator.c:1271 CPU: 0 PID: 621 Comm: kworker/u4:6 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: bat_events batadv_purge_orig pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : should_resched arch/arm64/include/asm/preempt.h:79 [inline]  pc : __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:388  lr : __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 sp : ffff800099007970 x29: ffff800099007980 x28: 1fffe00018fce1bd x27: dfff800000000000 x26: ffff0000d2620008 x25: ffff0000c7e70de8 x24: 0000000000000001 x23: 1fffe00018e57781 x22: dfff800000000000 x21: ffff80008aab71c4 x20: ffff0001b40136c0 x19: ffff0000c72bbc08 x18: 1fffe0001a817bb0 x17: ffff800125414000 x16: ffff80008032116c x15: 0000000000000001 x14: 1fffe0001ee9d610 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 00000000005e5789 x7 : ffff80008aab61dc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000000000080 x0 : ffff800125414000 Call trace:   __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline]   arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline]   __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386   __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]   _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210   spin_unlock_bh include/linux/spinlock.h:396 [inline]   batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287   batadv_purge_orig+0x20/0x70 net/batman-adv/originator.c:1300   process_one_work+0x694/0x1204 kernel/workqueue.c:2633   process_scheduled_works kernel/workqueue.c:2706 [inline]   worker_thread+0x938/0xef4 kernel/workqueue.c:2787   kthread+0x288/0x310 kernel/kthread.c:388   ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:51  lr : default_idle_call+0xf8/0x128 kernel/sched/idle.c:103 sp : ffff800093a17d30 x29: ffff800093a17d30 x28: dfff800000000000 x27: 1ffff00012742fb4 x26: ffff80008ec9d000 x25: 0000000000000000 x24: 0000000000000002 x23: 1ffff00011d93a74 x22: ffff80008ec9d3a0 x21: 0000000000000000 x20: ffff0000c19dbc00 x19: ffff8000802d0fd8 x18: 1fffe00036804396 x17: ffff80008ec9d000 x16: ffff8000802d089c x15: 0000000000000001 ---truncated---","modified":"2026-09-15T09:03:14.281335125Z","published":"2024-07-12T13:15:19.627Z","upstream":["CVE-2024-40981"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-40981"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.99-1"}]}],"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","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40981.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40981.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40981.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"}]}