Answer in brief
CVE-2026-74630 records a Unknown severity vulnerability in ipv6: prevent in6_dev_get() from resurrecting inet6_dev. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8814c4b533817df825485ff32ce6ac406c3a54d1 <785d908f8d21c8bc78b6fb2c2932ab662bf6918a || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8 || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <145812b678de9f3b59780173be3c0d22ed60dd93 || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <cc5bd568f9b7683e60841b6fd02c10d64535bd6e || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <1c206d461c680c3151daa3c89fc26eaf5bf98a7f || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <680fbd7942185448eadb990a3d10a53eb946b702 || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <14e812ab41df0cac033479da835ec9a5de633404 || >=8814c4b533817df825485ff32ce6ac406c3a54d1 <0e243671bc7b8eaf00f83dd2f4367436dc0cff98 | 785d908f8d21c8bc78b6fb2c2932ab662bf6918a, aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8, 145812b678de9f3b59780173be3c0d22ed60dd93, cc5bd568f9b7683e60841b6fd02c10d64535bd6e, 1c206d461c680c3151daa3c89fc26eaf5bf98a7f, 680fbd7942185448eadb990a3d10a53eb946b702, 14e812ab41df0cac033479da835ec9a5de633404, 0e243671bc7b8eaf00f83dd2f4367436dc0cff98 |
| Linux/Linuxgeneric | 2.6.19 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.