7.8

CVE-2026-74630: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74630DEBIAN-CVE-2026-74630
Published 22-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74630 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 16
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4639-1SUSE-SU-2026:4640-1SUSE-SU-2026:4660-1SUSE-SU-2026:4665-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 785d908f8d21c8bc78b6fb2c2932ab662bf6918a | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8 | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 145812b678de9f3b59780173be3c0d22ed60dd93 | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < cc5bd568f9b7683e60841b6fd02c10d64535bd6e | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 1c206d461c680c3151daa3c89fc26eaf5bf98a7f | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 680fbd7942185448eadb990a3d10a53eb946b702 | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 14e812ab41df0cac033479da835ec9a5de633404 | ≥ 8814c4b533817df825485ff32ce6ac406c3a54d1, < 0e243671bc7b8eaf00f83dd2f4367436dc0cff98 | 2.6.19

3 vendors · 172 products

References

18 links
Show all 18 references