9.8

CVE-2026-74255: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-74255DEBIAN-CVE-2026-74255
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74255 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 23 · Related 23
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1SUSE-SU-2026:4282-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix UAF in tipc_l2_send_msg() Syzbot reported a slab-use-after-free in ipvlan_hard_header() when called from tipc_l2_send_msg(). The root cause is that tipc_disable_l2_media() calls synchronize_net() while b->media_ptr is still valid. This allows concurrent RCU readers to obtain the device pointer after synchronize_net() has finished. The pointer is cleared later in bearer_disable(), but without any subsequent synchronization, allowing the device to be freed while still in use by readers. Fix this by clearing b->media_ptr in tipc_disable_l2_media() before calling synchronize_net(). This is safe to do now because the call order in bearer_disable() was reversed in 0d051bf93c06 ("tipc: make bearer packet filtering generic") to call tipc_node_delete_links() (which needs the pointer) before disable_media(). https: //lore.kernel.org/netdev/6a2c1007.428ffe26.258b27.015d.GAE@google.com/T/#u

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

-0.01 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.50%

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 | < 6.8.0-147.147 | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ 282b3a056225b35024246f63feb91d769d714dad, < 609ced2301be1df7e7ed2ef47d1d916674e6ba3b | ≥ 282b3a056225b35024246f63feb91d769d714dad, < 71aafa16d79b107b33837f60b6cbc7d0cb8c5708 | ≥ 282b3a056225b35024246f63feb91d769d714dad, < f4002f1c669cc02e3763f479fc25ff1dfa9e2420 | ≥ 282b3a056225b35024246f63feb91d769d714dad, < 50ff092633b06382e5091dd5b093ce943d4ac2f9 | ≥ 282b3a056225b35024246f63feb91d769d714dad, < aef12b5ce793dea6b3a97a58fd0f946000ae8945 | ≥ 282b3a056225b35024246f63feb91d769d714dad, < 0d8a12d7143126afdf9fbe2e3d438650dd6603ed | ≥ 282b3a056225b35024246f63feb91d769d714dad, < 35e0297a93c3c34a3924eeef816c03504e3ab5c5 | ≥ 282b3a056225b35024246f63feb91d769d714dad, < f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 | 4.4

3 vendors · 171 products

References

27 links
Show all 27 references