TI-2026-68255 Aliases CVE-2026-98364 GHSA-qcc9-56m7-mpxg

Use-after-free in Linux kernel xfrm bundle creation

LOW 33Published 2026-10-06 · Updated 2026-10-19

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 13 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

The Linux kernel from 2.6.25 is affected. In the xfrm bundle creation code, a network device pointer is read without a device reference under RCU, so a concurrent link deletion can free the device and cause a use-after-free. A local user with low privileges can trigger this, with high impact on confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

In the Linux kernel, the following vulnerability has been resolved: xfrm: hold net_device reference under RCU in bundle creation xfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into a local pointer without taking a device reference, then pass it to xfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via dst_dev_put() and frees the old net_device, causing a use-after-free when xfrm6_fill_dst() later dereferences the stale dev pointer. BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860 (net/ipv6/xfrm6_policy.c:86 netdev_hold()) Read of size 8 at addr ffff8880142fe588 by task exploit/153 Call Trace: xfrm6_fill_dst+0x82c/0x860 xfrm_resolve_and_create_bundle+0x21d4/0x2bd0 xfrm_lookup_with_ifid+0x485/0x1640 ip6_dst_lookup_flow+0x19b/0x1e0 udpv6_sendmsg+0x1443/0x2dd0 Fix this by reading dst->dev via dst_dev_rcu() and keeping the RCU read-side critical section active until xfrm_fill_dst() has taken the required device references.

Why it matters now

EPSS 0.00121 1st percentileScored 2026-11-07

Fix Partial Linux (Linux): 7.2.8, 7.3Red Hat: 3 advisoriesRed Hat: 13 fixed, 5 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	2.6.25 and later	7.2.8, 7.3	Patch available	CNA

Linux VendorLinux Affected 2.6.25 and later Fixed in 7.2.8, 7.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	—	—	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

Linux kernel 7.2.8 and 7.3 contain the fix. Red Hat fixes it in RHSA-2026:93413 for RHEL 10, RHSA-2026:93412 for RHEL 9 and RHSA-2026:95346 for OpenShift Container Platform 4.22. The sources list no fixed version for Red Hat Enterprise Linux 7, 8 or 9, or for Red Hat OpenShift Container Platform 4 or 5.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Fix · CNA Linux (Linux) Fixed in 7.2.8, 7.3

Red Hat 3 advisories

RHSA-2026:95346 Released 2026-11-06 · Red Hat rating Critical
OpenShift Container Platform 4.22.22 bug fix and security update
- Red Hat OpenShift Container Platform 4.22 rhcos-aarch64-4.22.9.8.202611032353-0, rhcos-ppc64le-4.22.9.8.202611032353-0, rhcos-s390x-4.22.9.8.202611032353-0 +1
RHSA-2026:93413 Released 2026-11-01 · Red Hat rating Important
kernel security, bug fix, and enhancement update
- 10Base-SMTV kernel-modules-internal-6.12.0-211.72.1.el10_2
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.72.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.72.1.el10_2, kernel-64k-devel-6.12.0-211.72.1.el10_2 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.72.1.el10_2, kernel-64k-6.12.0-211.72.1.el10_2, kernel-64k-core-6.12.0-211.72.1.el10_2 +29
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.72.1.el10_2, libperf-6.12.0-211.72.1.el10_2
- Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.72.1.el10_2
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.72.1.el10_2, kernel-rt-64k-6.12.0-211.72.1.el10_2, kernel-rt-64k-core-6.12.0-211.72.1.el10_2 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.72.1.el10_2, kernel-rt-core-6.12.0-211.72.1.el10_2, kernel-rt-debug-6.12.0-211.72.1.el10_2 +9
RHSA-2026:93412 Released 2026-11-01 · Red Hat rating Important
kernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.64.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.64.1.el9_8, kernel-64k-devel-5.14.0-687.64.1.el9_8 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.64.1.el9_8, kernel-64k-5.14.0-687.64.1.el9_8, kernel-64k-core-5.14.0-687.64.1.el9_8 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.64.1.el9_8, libperf-5.14.0-687.64.1.el9_8
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.64.1.el9_8, kernel-rt-64k-5.14.0-687.64.1.el9_8, kernel-rt-64k-core-5.14.0-687.64.1.el9_8 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.64.1.el9_8, kernel-rt-core-5.14.0-687.64.1.el9_8, kernel-rt-debug-5.14.0-687.64.1.el9_8 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 7	Affected	No fix yet
Red Hat Enterprise Linux 8	Affected	No fix yet
Red Hat Enterprise Linux 9	Affected	No fix yet
Red Hat OpenShift Container Platform 4	Affected	No fix yet
Red Hat OpenShift Container Platform 5	Affected	No fix yet
10Base-SMTV	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux AppStream (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2026:93412
Red Hat Enterprise Linux BaseOS (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux BaseOS (v. 9)	Fixed	RHSA-2026:93412
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)	Fixed	RHSA-2026:93412
Red Hat Enterprise Linux Hidden (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux Real Time (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux Real Time (v. 9)	Fixed	RHSA-2026:93412
Red Hat Enterprise Linux Real Time for NFV (v. 10)	Fixed	RHSA-2026:93413
Red Hat Enterprise Linux Real Time for NFV (v. 9)	Fixed	RHSA-2026:93412
Red Hat OpenShift Container Platform 4.22	Fixed	RHSA-2026:95346

Not affected: 1 product

Red Hat Enterprise Linux 6

Timeline

2026-10-06 Threatist record created from CVE-2026-98364
2026-10-06 Alias added: GHSA-qcc9-56m7-mpxg
2026-10-07 CVSS score added · CNA
2026-10-09 Affected versions changed · Red Hat
2026-10-09 CVSS score added · Red Hat
2026-10-19 Fix available: Linux/[email protected] · CNA
2026-10-30 Affected versions changed · Red Hat
2026-11-01 Affected versions changed · Red Hat
2026-11-01 CVSS score changed · Red Hat
2026-11-02 Fix available: RHSA-2026:93413 · Red Hat
2026-11-02 Fix available: RHSA-2026:93412 · Red Hat
2026-11-02 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +9 · Red Hat
2026-11-07 Fix available: RHSA-2026:95346 · Red Hat
2026-11-07 Fix available: Red Hat OpenShift Container Platform 4.22 · Red Hat

References

Other 2

TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4

See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences