{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38150","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.988Z","datePublished":"2025-07-03T08:35:55.257Z","dateUpdated":"2026-08-05T11:59:53.344Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:59:53.344Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_packet: move notifier's packet_dev_mc out of rcu critical section\n\nSyzkaller reports the following issue:\n\n BUG: sleeping function called from invalid context at kernel/locking/mutex.c:578\n __mutex_lock+0x106/0xe80 kernel/locking/mutex.c:746\n team_change_rx_flags+0x38/0x220 drivers/net/team/team_core.c:1781\n dev_change_rx_flags net/core/dev.c:9145 [inline]\n __dev_set_promiscuity+0x3f8/0x590 net/core/dev.c:9189\n netif_set_promiscuity+0x50/0xe0 net/core/dev.c:9201\n dev_set_promiscuity+0x126/0x260 net/core/dev_api.c:286 packet_dev_mc net/packet/af_packet.c:3698 [inline]\n packet_dev_mclist_delete net/packet/af_packet.c:3722 [inline]\n packet_notifier+0x292/0xa60 net/packet/af_packet.c:4247\n notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85\n call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]\n call_netdevice_notifiers net/core/dev.c:2228 [inline]\n unregister_netdevice_many_notify+0x15d8/0x2330 net/core/dev.c:11972\n rtnl_delete_link net/core/rtnetlink.c:3522 [inline]\n rtnl_dellink+0x488/0x710 net/core/rtnetlink.c:3564\n rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6955\n netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534\n\nCalling `PACKET_ADD_MEMBERSHIP` on an ops-locked device can trigger\nthe `NETDEV_UNREGISTER` notifier, which may require disabling promiscuous\nand/or allmulti mode. Both of these operations require acquiring\nthe netdev instance lock.\n\nMove the call to `packet_dev_mc` outside of the RCU critical section.\nThe `mclist` modifications (add, del, flush, unregister) are protected by\nthe RTNL, not the RCU. The RCU only protects the `sklist` and its\nassociated `sks`. The delayed operation on the `mclist` entry remains\nwithin the RTNL."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Triggering requires local syscalls — an AF_PACKET socket with `setsockopt(PACKET_ADD_MEMBERSHIP)` plus an rtnetlink `RTM_DELLINK` (or netns teardown) to fire `NETDEV_UNREGISTER`. No remote peer can reach `packet_notifier()`.\nAC:L - The attacker performs every step deterministically: create the ops-locked/team device, add the promisc membership, then delete the device — the promiscuity 1→0 transition guarantees the sleeping call under RCU. Mutex contention and the concurrent `packet_release()` needed for the memory-safety outcome are both created by the attacker's own threads and sockets.\nPR:L - `packet_create()` checks only `ns_capable(net->user_ns, CAP_NET_RAW)`, and device create/delete needs CAP_NET_ADMIN in the netns — both granted to an unprivileged user inside `unshare -Urn`. No real root is required.\nUI:N - The attacking process performs the setsockopt and the device unregister itself; no victim action or cooperating process is involved.\nS:U - The fault and its consequences are confined to the kernel of the same host; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - Blocking inside the RCU read-side section lets a grace period (and a racing `packet_release()`'s `synchronize_net()`) complete early on non-preemptible-RCU kernels, so `sk_for_each_rcu()` keeps dereferencing a freed `packet_sock` — an attacker-groomable slab object that yields a kernel-memory read primitive.\nI:H - The same stale iteration then writes into the freed object (`spin_lock(&po->bind_lock)`, `sk->sk_err = ENETDOWN`, `WRITE_ONCE(po->ifindex, -1)`), and the forced `preempt_count_set()` in `schedule_debug()` corrupts preemption bookkeeping — both usable for controlled corruption and control-flow hijack.\nA:H - The confirmed syzbot outcome is a \"BUG: sleeping function called from invalid context\" oops (a panic under `panic_on_warn`/`panic_on_oops`), and blocking under RCU while holding RTNL causes grace-period stalls that can wedge the entire networking stack."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/packet/af_packet.c","net/packet/internal.h"],"versions":[{"version":"ad7c7b2172c388818a111455643491d75f535e90","lessThan":"2dd4781c5af99415ebbd2f7cc763feb109863c05","status":"affected","versionType":"git"},{"version":"ad7c7b2172c388818a111455643491d75f535e90","lessThan":"d8d85ef0a631df9127f202e6371bb33a0b589952","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/packet/af_packet.c","net/packet/internal.h"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.15.3","lessThanOrEqual":"6.15.*","status":"unaffected","versionType":"semver"},{"version":"6.16","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.15.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2dd4781c5af99415ebbd2f7cc763feb109863c05"},{"url":"https://git.kernel.org/stable/c/d8d85ef0a631df9127f202e6371bb33a0b589952"}],"title":"af_packet: move notifier's packet_dev_mc out of rcu critical section","x_generator":{"engine":"bippy-1.2.0"}}}}