CVE-2026-53184— udp: clear skb->dev before running a sockmap verdict
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I. Basic Information for CVE-2026-53184
Vulnerability Information
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Vulnerability Title
udp: clear skb->dev before running a sockmap verdict
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: udp: clear skb->dev before running a sockmap verdict On the UDP receive path skb->dev is repurposed as dev_scratch (the truesize/state cache set by udp_set_dev_scratch()), through the union { struct net_device *dev; unsigned long dev_scratch; } in sk_buff. When a UDP socket is in a sockmap, sk_data_ready is sk_psock_verdict_data_ready(), which calls udp_read_skb() -> recv_actor() (sk_psock_verdict_recv) to run the attached SK_SKB verdict program in softirq. If that program calls a socket-lookup helper (bpf_sk_lookup_tcp/udp, bpf_skc_lookup_tcp), bpf_skc_lookup() does: if (skb->dev) caller_net = dev_net(skb->dev); skb->dev still holds the dev_scratch value (a non-NULL integer), so dev_net() dereferences it as a struct net_device * and the kernel takes a general protection fault on a non-canonical address in softirq: Oops: general protection fault, probably for non-canonical address 0x1010000800004a0 CPU: 1 UID: 0 PID: 1406 Comm: syz.2.19 Not tainted 7.1.0-rc6 #1 PREEMPT(full) RIP: 0010:bpf_skc_lookup net/core/filter.c:7033 [inline] RIP: 0010:bpf_sk_lookup+0x45/0x160 net/core/filter.c:7047 Call Trace: <IRQ> bpf_prog_4675cb904b7071f8+0x12e/0x14e bpf_prog_run_pin_on_cpu+0xc6/0x1f0 sk_psock_verdict_recv+0x1ba/0x350 udp_read_skb+0x31a/0x370 sk_psock_verdict_data_ready+0x2e3/0x600 __udp_enqueue_schedule_skb+0x4c8/0x650 udpv6_queue_rcv_one_skb+0x3ec/0x740 udp6_unicast_rcv_skb+0x11d/0x140 ip6_protocol_deliver_rcu+0x61e/0x950 ip6_input_finish+0xa9/0x150 NF_HOOK+0x286/0x2f0 ip6_input+0x117/0x220 NF_HOOK+0x286/0x2f0 __netif_receive_skb+0x85/0x200 process_backlog+0x374/0x9a0 __napi_poll+0x4f/0x1c0 net_rx_action+0x3b0/0x770 handle_softirqs+0x15a/0x460 do_softirq+0x57/0x80 </IRQ> The rmem charge that dev_scratch accounted for is released by skb_recv_udp() on dequeue, just above, so the scratch is dead by the time recv_actor() runs. Clear skb->dev so bpf_skc_lookup() falls back to sock_net(skb->sk), which skb_set_owner_sk_safe() set just above.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-53184
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Patches & Fixes for CVE-2026-53184 (5)
Other References for CVE-2026-53184 (1)
Same Patch Batch · Linux · 2026-06-25 · 147 CVEs total
| CVE-2026-53187 | RDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc | |
| CVE-2026-53167 | fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios | |
| CVE-2026-53168 | fuse: reject fuse_notify() pagecache ops on directories | |
| CVE-2026-53169 | accel/ethosu: reject NPU_OP_RESIZE commands from userspace | |
| CVE-2026-53171 | accel/ethosu: fix arithmetic issues in dma_length() | |
| CVE-2026-53170 | accel/ethosu: reject DMA commands with uninitialized length | |
| CVE-2026-53172 | accel/ethosu: fix IFM region index out-of-bounds in command stream parser | |
| CVE-2026-53174 | ovl: keep err zero after successful ovl_cache_get() | |
| CVE-2026-53173 | accel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate() | |
| CVE-2026-53175 | inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush | |
| CVE-2026-53177 | bnxt_en: Fix NULL pointer dereference | |
| CVE-2026-53176 | IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN | |
| CVE-2026-53178 | staging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction | |
| CVE-2026-53180 | timers/migration: Fix livelock in tmigr_handle_remote_up() | |
| CVE-2026-53179 | staging: rtl8723bs: fix buffer over-read in rtw_update_protection | |
| CVE-2026-53181 | vsock/vmci: fix sk_ack_backlog leak on failed handshake | |
| CVE-2026-53182 | wifi: nl80211: reject oversized EMA RNR lists | |
| CVE-2026-53183 | mptcp: allow subflow rcv wnd to shrink | |
| CVE-2026-53185 | zram: fix use-after-free in zram_bvec_write_partial() | |
| CVE-2026-53197 | xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state() |
Showing top 20 of 147 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-53277
KVM: arm64: Take the SRCU lock for page table walks in fault - CVE-2026-53276
Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer - CVE-2026-53275
ipv6: mcast: Fix use-after-free when processing MLD queries - CVE-2026-53274
net/smc: fix sleep-inside-lock in __smc_setsockopt() causing - CVE-2026-53273
tee: optee: prevent use-after-free when the client exits bef
Same vendor: Linux
- CVE-2026-53277
KVM: arm64: Take the SRCU lock for page table walks in fault - CVE-2026-53276
Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer - CVE-2026-53275
ipv6: mcast: Fix use-after-free when processing MLD queries - CVE-2026-53274
net/smc: fix sleep-inside-lock in __smc_setsockopt() causing - CVE-2026-53273
tee: optee: prevent use-after-free when the client exits bef
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