High 7.8Published Aug 22, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	8814c4b533817df825485ff32ce6ac406c3a54d1 builds before 785d908f8d21c8bc78b6fb2c2932ab662bf6918a; from 8814c4b533817df825485ff32ce6ac406c3a54d1 before aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8; from 8814c4b533817df825485ff32ce6ac406c3a54d1 before 145812b678de9f3b59780173be3c0d22ed60dd93; from 8814c4b533817df825485ff32ce6ac406c3a54d1 before cc5bd568f9b7683e60841b6fd02c10d64535bd6e; 8814c4b533817df825485ff32ce6ac406c3a54d1 builds before 1c206d461c680c3151daa3c89fc26eaf5bf98a7f; 8814c4b533817df825485ff32ce6ac406c3a54d1 builds before 680fbd7942185448eadb990a3d10a53eb946b702; 8814c4b533817df825485ff32ce6ac406c3a54d1 builds before 14e812ab41df0cac033479da835ec9a5de633404; 8814c4b533817df825485ff32ce6ac406c3a54d1 builds before 0e243671bc7b8eaf00f83dd2f4367436dc0cff98	CNA record

References

References

https://git.kernel.org/stable/c/785d908f8d21c8bc78b6fb2c2932ab662bf6918a
https://git.kernel.org/stable/c/aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8
https://git.kernel.org/stable/c/145812b678de9f3b59780173be3c0d22ed60dd93
https://git.kernel.org/stable/c/cc5bd568f9b7683e60841b6fd02c10d64535bd6e
https://git.kernel.org/stable/c/1c206d461c680c3151daa3c89fc26eaf5bf98a7f
https://git.kernel.org/stable/c/680fbd7942185448eadb990a3d10a53eb946b702
https://git.kernel.org/stable/c/14e812ab41df0cac033479da835ec9a5de633404
https://git.kernel.org/stable/c/0e243671bc7b8eaf00f83dd2f4367436dc0cff98

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.