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CVE-2026-74630— ipv6: prevent in6_dev_get() from resurrecting inet6_dev

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： IPv6：防止 使 结构体“复活” 在 RCU 保护下读取 ，然后无条件地增加其引用计数。然而，在读取指针和增加引用计数这两个操作之间，设备拆除过程可能会清空该指针并释放最后一个引用。此时，引用计数的增加会使一个其 RCU 销毁队列已排队的对象“复活”，导致调用方在对象已被释放后仍可使用它。 为解决此问题，改用 ，并在对象引用计数已为零时返回 NULL。RCU 机制在尝试获取引用期间保证内存可访问；只有当引用计数成功递增时，才将对象生命周期延长以供调用方使用。 在对未打补丁

AI Predicted 8.8 Difficulty: Moderate EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8814c4b533817df825485ff32ce6ac406c3a54d1< 785d908f8d21c8bc78b6fb2c2932ab662bf6918a affected
8814c4b533817df825485ff32ce6ac406c3a54d1< aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8 affected
8814c4b533817df825485ff32ce6ac406c3a54d1< 145812b678de9f3b59780173be3c0d22ed60dd93 affected
8814c4b533817df825485ff32ce6ac406c3a54d1< cc5bd568f9b7683e60841b6fd02c10d64535bd6e affected
8814c4b533817df825485ff32ce6ac406c3a54d1< 1c206d461c680c3151daa3c89fc26eaf5bf98a7f affected
8814c4b533817df825485ff32ce6ac406c3a54d1< 680fbd7942185448eadb990a3d10a53eb946b702 affected
8814c4b533817df825485ff32ce6ac406c3a54d1< 14e812ab41df0cac033479da835ec9a5de633404 affected
8814c4b533817df825485ff32ce6ac406c3a54d1< 0e243671bc7b8eaf00f83dd2f4367436dc0cff98 affected
… +10 more rows
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I. Basic Information for CVE-2026-74630

Vulnerability Information
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Vulnerability Title
ipv6: prevent in6_dev_get() from resurrecting inet6_dev
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent in6_dev_get() from resurrecting inet6_dev in6_dev_get() reads dev->ip6_ptr under RCU and then unconditionally increments its refcount. Device teardown can clear the pointer and drop the last reference between these operations. The increment then resurrects an object whose RCU free has already been queued, so callers can use it after it is freed. Use refcount_inc_not_zero() and return NULL when the object has already reached zero. RCU keeps the memory accessible through the attempted reference acquisition, and a successful increment pins the object for the caller. An independent run on the exact unpatched 6f5156d7a31a (v7.2-rc3) kernel reproduced the invalid reference acquisition as UID 1000: refcount_t: addition on 0; use-after-free. ip6_mc_source+0xef4/0x17e0 It was followed by the corresponding reference underflow in ip6_mc_source(). The supplied trace from the same unpatched revision additionally shows the access after the RCU read-side section ends: BUG: KASAN: slab-use-after-free in mutex_lock+0x76/0xe0 Write of size 8 at addr ffff888015b50240 by task poc/1219 Bug found and triaged by OpenAI Security Research and validated by Trail of Bits.
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 8814c4b533817df825485ff32ce6ac406c3a54d1 ~ 785d908f8d21c8bc78b6fb2c2932ab662bf6918a -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-74630

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-74630

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Patches & Fixes for CVE-2026-74630 (7)

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

CVE-2026-74640 ALSA: FCP: fix OOB write in fcp_meter_ctl_get()
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-2026-74632 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-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74651 staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()

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-2026-74630

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