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CVE-2026-98849— pfcp: fix socket lifetime on netdevice registration failure

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： pfcp：修复网络设备注册失败时的套接字生命周期问题 pfcp_newlink() 函数在调用 register_netdevice() 之前创建了 UDP 套接字。如果在 pfcp_dev_init() 成功之后、register_netdevice() 调用时注册失败，内核核心会调用 pfcp_dev_uninit()，该函数会释放套接字并将 pfcp->sk 指针清零。然而，newlink 的错误处理路径随后再次尝试释放该套接字，导致对 NULL 指针的解引用。该

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 76c8764ef36a5d37ea2e551bda28ac7f028383ba< dcb8f6a79c3360a440c399d85df465a6e59351f1 affected
76c8764ef36a5d37ea2e551bda28ac7f028383ba< 4b8ce1686dea1a10805a0807bf492409b0300ee1 affected
76c8764ef36a5d37ea2e551bda28ac7f028383ba< 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46 affected
76c8764ef36a5d37ea2e551bda28ac7f028383ba< 0f17d2e3dd9cda3ee6d94033d5e5489af168920d affected
6.10 affected
< 6.10 unaffected
6.12.113≤ 6.12.* unaffected
6.18.56≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98849

Vulnerability Information
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Vulnerability Title
pfcp: fix socket lifetime on netdevice registration failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pfcp: fix socket lifetime on netdevice registration failure pfcp_newlink() creates the UDP socket before register_netdevice(). If registration fails after pfcp_dev_init() succeeds, the core calls pfcp_dev_uninit(), which releases the socket and clears pfcp->sk. The newlink error path then releases it again, causing a NULL pointer dereference. This was observed with failslab fault injection: FAULT_INJECTION: forcing a failure. kobject: kobject_add_internal failed for pfcp0 (error: -12 parent: net) BUG: KASAN: null-ptr-deref in udp_tunnel_sock_release+0x1c/0x50 Read of size 8 at addr 0000000000000120 by task ip/1037 Call trace: show_stack+0x18/0x24 (C) dump_stack_lvl+0x78/0x90 print_report+0x468/0x5cc kasan_report+0xa4/0xf0 __asan_load8+0x7c/0xd0 udp_tunnel_sock_release+0x1c/0x50 pfcp_newlink+0x128/0x184 rtnl_newlink+0x848/0xe44 rtnetlink_rcv_msg+0x468/0x514 netlink_rcv_skb+0xc0/0x1f0 rtnetlink_rcv+0x18/0x24 netlink_unicast+0x4b8/0x558 netlink_sendmsg+0x2b8/0x584 ... Return from pfcp_del_sock() if pfcp->sk is NULL.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 76c8764ef36a5d37ea2e551bda28ac7f028383ba ~ dcb8f6a79c3360a440c399d85df465a6e59351f1 -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-98849

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III. Intelligence Information for CVE-2026-98849

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Patches & Fixes for CVE-2026-98849 (4)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98568 vxlan: use one headroom snapshot for neighbour replies
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98589 bpf: Reject pkt arguments in mutating subprogs
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98849

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