memory leak in ieee80211_mesh_csa_beacon

Status: upstream: reported C repro on 2026/08/23 16:52
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com
Fix commit: 860134b3af77 wifi: mac80211: mesh: reset the CSA state when leaving
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-snapshot-upstream-root ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-rust-kasan-gce ci2-upstream-usb]
First crash: 35d, last: 11d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
c78f57b2 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in ieee80211_mesh_csa_beacon 2026/08/19 16:45 2026/08/19 16:45 2026/08/19 17:22 1e72964b
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH v2] wifi: mac80211: mesh: free pending CSA settings on interface stop 4 (4) 2026/09/23 03:28
[syzbot] [wireless?] memory leak in ieee80211_mesh_csa_beacon 0 (3) 2026/09/12 20:10
[PATCH RESEND wireless 08/10] wifi: mac80211: mesh: reset the CSA state when leaving 1 (1) 2026/09/08 12:28
[PATCH wireless 08/10] wifi: mac80211: mesh: reset the CSA state when leaving 1 (1) 2026/09/04 14:58
[PATCH] wifi: mac80211: mesh: free pending CSA settings on interface stop 3 (3) 2026/08/25 01:21
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2026/09/05 16:22 5h39m retest repro upstream report job log log
2026/09/05 16:22 14m retest repro upstream report job log log
2026/09/05 16:22 16m retest repro upstream report job log log
2026/08/24 02:42 38m kartikey406@gmail.com patch upstream OK job log log

Sample crash report:
2026/09/12 20:09:52 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888107ffb800 (size 1024):
  comm "syz.0.18", pid 5913, jiffies 4294943824
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    d8 23 48 14 81 88 ff ff 00 00 00 00 00 00 00 00  .#H.............
  backtrace (crc f81fd0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4696 [inline]
    slab_alloc_node mm/slub.c:4996 [inline]
    __kmalloc_cache_noprof+0x38f/0x420 mm/slub.c:5559
    _kmalloc_noprof include/linux/slab.h:991 [inline]
    ieee80211_mesh_csa_beacon+0x2e/0x100 net/mac80211/mesh.c:1547
    ieee80211_set_csa_beacon net/mac80211/cfg.c:4674 [inline]
    __ieee80211_channel_switch+0xb22/0xed0 net/mac80211/cfg.c:4795
    rdev_channel_switch net/wireless/rdev-ops.h:1168 [inline]
    nl80211_channel_switch+0x39b/0x780 net/wireless/nl80211.c:12388
    genl_family_rcv_msg_doit+0x12e/0x1a0 net/netlink/genetlink.c:1114
    genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
    genl_rcv_msg+0x302/0x440 net/netlink/genetlink.c:1209
    netlink_rcv_skb+0x89/0x1c0 net/netlink/af_netlink.c:2556
    genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
    netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
    netlink_unicast+0x38f/0x4e0 net/netlink/af_netlink.c:1345
    netlink_sendmsg+0x335/0x690 net/netlink/af_netlink.c:1900
    sock_sendmsg_nosec net/socket.c:800 [inline]
    __sock_sendmsg net/socket.c:815 [inline]
    ____sys_sendmsg+0x54a/0x580 net/socket.c:2713
    ___sys_sendmsg+0x101/0x140 net/socket.c:2767
    __sys_sendmsg+0xcd/0x140 net/socket.c:2799
    do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
    do_syscall_64+0xe9/0x530 arch/x86/entry/syscall_64.c:84
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888107ff8400 (size 1024):
  comm "syz.0.19", pid 5915, jiffies 4294943825
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    d8 23 48 14 81 88 ff ff 00 00 00 00 00 00 00 00  .#H.............
  backtrace (crc f81fd0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4696 [inline]
    slab_alloc_node mm/slub.c:4996 [inline]
    __kmalloc_cache_noprof+0x38f/0x420 mm/slub.c:5559
    _kmalloc_noprof include/linux/slab.h:991 [inline]
    ieee80211_mesh_csa_beacon+0x2e/0x100 net/mac80211/mesh.c:1547
    ieee80211_set_csa_beacon net/mac80211/cfg.c:4674 [inline]
    __ieee80211_channel_switch+0xb22/0xed0 net/mac80211/cfg.c:4795
    rdev_channel_switch net/wireless/rdev-ops.h:1168 [inline]
    nl80211_channel_switch+0x39b/0x780 net/wireless/nl80211.c:12388
    genl_family_rcv_msg_doit+0x12e/0x1a0 net/netlink/genetlink.c:1114
    genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
    genl_rcv_msg+0x302/0x440 net/netlink/genetlink.c:1209
    netlink_rcv_skb+0x89/0x1c0 net/netlink/af_netlink.c:2556
    genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
    netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
    netlink_unicast+0x38f/0x4e0 net/netlink/af_netlink.c:1345
    netlink_sendmsg+0x335/0x690 net/netlink/af_netlink.c:1900
    sock_sendmsg_nosec net/socket.c:800 [inline]
    __sock_sendmsg net/socket.c:815 [inline]
    ____sys_sendmsg+0x54a/0x580 net/socket.c:2713
    ___sys_sendmsg+0x101/0x140 net/socket.c:2767
    __sys_sendmsg+0xcd/0x140 net/socket.c:2799
    do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
    do_syscall_64+0xe9/0x530 arch/x86/entry/syscall_64.c:84
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/12 20:10 upstream 5225b8eec4c9 70a60e12 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ieee80211_mesh_csa_beacon
2026/08/19 20:15 upstream bd5f485f3f02 1e72964b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ieee80211_mesh_csa_beacon
2026/08/19 17:56 upstream bd5f485f3f02 1e72964b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ieee80211_mesh_csa_beacon
2026/08/19 16:45 upstream bd5f485f3f02 1e72964b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ieee80211_mesh_csa_beacon
* Struck through repros no longer work on HEAD.