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CVE-2026-74705— udp: fix potential use-after-free in tunnel segmentation

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，已修复以下漏洞： UDP：修复隧道分段中的潜在释放后使用（use-after-free）问题 __skb_udp_tunnel_segment() 函数在确保隧道头部位于 skb 头部之前，就先获取了 UDP 头部。如果 pull 操作重新分配了 skb->head，那么之前保存的 UDP 头部指针将不再有效。 因此，该修复将获取 UDP 头部的操作移到了 pull 操作之后，以避免潜在的释放后使用问题。

AI Predicted 4.7 Difficulty: Moderate EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 6a733a38b983d8c2e222f13968209010cf44de87 affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 19d89b13a43640b2da2f277ee462d919d988cb6f affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< b3df61bb745eb5201eac22679a2839d4ccbf3442 affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 1ae134c012e10384cdac420b5cc6e0615cde0b55 affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 5161e67c561c4f28a5d9335a6e859b02511de92b affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 64d322c288577793eedd352b96ef75234ed380fe affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< 588d4a6795d99d080f74ef0b5f391ea8c453ae5d affected
dbef491ebe7f3a4fb1b9111878b86a426fd540b7< d0f86fb36eb260abd10007b62c9dcc1028e03e61 affected
… +10 more rows
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I. Basic Information for CVE-2026-74705

Vulnerability Information
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Vulnerability Title
udp: fix potential use-after-free in tunnel segmentation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.
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 dbef491ebe7f3a4fb1b9111878b86a426fd540b7 ~ 6a733a38b983d8c2e222f13968209010cf44de87 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-74705

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III. Intelligence Information for CVE-2026-74705

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Patches & Fixes for CVE-2026-74705 (6)

Other References for CVE-2026-74705 (1)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74621 net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74624 netfilter: nf_conntrack: defer invalid log until after unlock
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74650 staging: rtl8723bs: fix OOB read in WMM_param_handler()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74705

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