CVE-2025-21852— net: Add rx_skb of kfree_skb to raw_tp_null_args[].
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I. Basic Information for CVE-2025-21852
Vulnerability Information
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Vulnerability Title
net: Add rx_skb of kfree_skb to raw_tp_null_args[].
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: Add rx_skb of kfree_skb to raw_tp_null_args[]. Yan Zhai reported a BPF prog could trigger a null-ptr-deref [0] in trace_kfree_skb if the prog does not check if rx_sk is NULL. Commit c53795d48ee8 ("net: add rx_sk to trace_kfree_skb") added rx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL. Let's add kfree_skb to raw_tp_null_args[] to let the BPF verifier validate such a prog and prevent the issue. Now we fail to load such a prog: libbpf: prog 'drop': -- BEGIN PROG LOAD LOG -- 0: R1=ctx() R10=fp0 ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21 0: (79) r3 = *(u64 *)(r1 +24) func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock' 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1) ; bpf_printk("sk: %d, %d\n", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24 1: (69) r4 = *(u16 *)(r3 +16) R3 invalid mem access 'trusted_ptr_or_null_' processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 -- END PROG LOAD LOG -- Note this fix requires commit 838a10bd2ebf ("bpf: Augment raw_tp arguments with PTR_MAYBE_NULL"). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000010 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 PREEMPT SMP RIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d Call Trace: <TASK> ? __die+0x1f/0x60 ? page_fault_oops+0x148/0x420 ? search_bpf_extables+0x5b/0x70 ? fixup_exception+0x27/0x2c0 ? exc_page_fault+0x75/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d bpf_trace_run4+0x68/0xd0 ? unix_stream_connect+0x1f4/0x6f0 sk_skb_reason_drop+0x90/0x120 unix_stream_connect+0x1f4/0x6f0 __sys_connect+0x7f/0xb0 __x64_sys_connect+0x14/0x20 do_syscall_64+0x47/0xc30 entry_SYSCALL_64_after_hwframe+0x4b/0x53
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查rx_sk空值，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-21852
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Same Patch Batch · Linux · 2025-03-12 · 26 CVEs total
| CVE-2025-21855 | ibmvnic: Don't reference skb after sending to VIOS | |
| CVE-2024-58087 | ksmbd: fix racy issue from session lookup and expire | |
| CVE-2024-58088 | bpf: Fix deadlock when freeing cgroup storage | |
| CVE-2024-58089 | btrfs: fix double accounting race when btrfs_run_delalloc_range() failed | |
| CVE-2025-21844 | smb: client: Add check for next_buffer in receive_encrypted_standard() | |
| CVE-2025-21845 | mtd: spi-nor: sst: Fix SST write failure | |
| CVE-2025-21846 | acct: perform last write from workqueue | |
| CVE-2025-21848 | nfp: bpf: Add check for nfp_app_ctrl_msg_alloc() | |
| CVE-2025-21847 | ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data() | |
| CVE-2025-21849 | drm/i915/gt: Use spin_lock_irqsave() in interruptible context | |
| CVE-2025-21851 | bpf: Fix softlockup in arena_map_free on 64k page kernel | |
| CVE-2025-21850 | nvmet: Fix crash when a namespace is disabled | |
| CVE-2025-21853 | bpf: avoid holding freeze_mutex during mmap operation | |
| CVE-2025-21866 | powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC | |
| CVE-2025-21854 | sockmap, vsock: For connectible sockets allow only connected | |
| CVE-2025-21856 | s390/ism: add release function for struct device | |
| CVE-2025-21857 | net/sched: cls_api: fix error handling causing NULL dereference | |
| CVE-2025-21858 | geneve: Fix use-after-free in geneve_find_dev(). | |
| CVE-2025-21859 | USB: gadget: f_midi: f_midi_complete to call queue_work | |
| CVE-2025-21861 | mm/migrate_device: don't add folio to be freed to LRU in migrate_device_finalize() |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
Same vendor: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
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