NVD / CVE Program· CNA Linux

CVE-2026-53275: ipv6: mcast: Fix use-after-free when processing MLD queries

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 35/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 087dbacf897c020f438f780f0a4a8aa73b6d7c5a, 1354271c89d0e5fbf8b3d94097ff0216695209c7, 2a613bf497029d555a7428406aa8cdb84a503cea; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 087dbacf897c020f438f780f0a4a8aa73b6d7c5a, 1354271c89d0e5fbf8b3d94097ff0216695209c7, 2a613bf497029d555a7428406aa8cdb84a503cea; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: Fix use-after-free when processing MLD queries When processing an MLD query, a pointer to the multicast group address is retrieved when initially parsing the packet. This pointer is later dereferenced without being reloaded despite the fact that the skb header might have been reallocated following the pskb_may_pull() calls, leading to a use-after-free [1]. Fix by copying the multicast group address when the packet is initially parsed. [1] BUG: KASAN: slab-use-after-free in __mld_query_work (net/ipv6/mcast.c:1512) Read of size 8 at addr ffff8881154b8e90 by task kworker/4:1/118 Workqueue: mld mld_query_work Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_address_description.constprop.0 (mm/kasan/report.c:378) print_report (mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) __mld_query_work (net/ipv6/mcast.c:1512) mld_query_work (net/ipv6/mcast.c:1563) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) </TASK> [...] Freed by task 118: kasan_save_stack (mm/kasan/common.c:57) kasan_save_track (mm/kasan/common.c:78) kasan_save_free_info (mm/kasan/generic.c:584) __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) pskb_expand_head (net/core/skbuff.c:2335) __pskb_pull_tail (net/core/skbuff.c:2878 (discriminator 4)) __mld_query_work (net/ipv6/mcast.c:1495 (discriminator 1)) mld_query_work (net/ipv6/mcast.c:1563) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245)

Published: Jun 25, 2026
Updated: Nov 10, 2026
EPSS: 0.2% · 18th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 8.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 2.6.15affected
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before dfaf1f5e7eb81be87582bd6a57d34e61a57d5deaaffected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 1354271c89d0e5fbf8b3d94097ff0216695209c7affected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 53baa63a4183291574483f89583dbef13677a2c4affected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 2a613bf497029d555a7428406aa8cdb84a503ceaaffected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before b2eb8886200b907fc71806869620609f0f4cacb0affected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 4203806f700bb44ea0b05d484d9d40044b47fb04affected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 087dbacf897c020f438f780f0a4a8aa73b6d7c5aaffected · git
- 97300b5fdfe28c6edae926926f9467a27cf5889c and later · before 791c91dc7a9dfb2457d5e29b8216a6484b9c4b40affected · git
- before 2.6.15not affected · semver

Affected versions · NVD (7)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel2.6.15 and later · before 5.15.210
linux linux kernel5.16 and later · before 6.1.176
linux linux kernel6.2 and later · before 6.6.143
linux linux kernel6.7 and later · before 6.12.94
linux linux kernel6.13 and later · before 6.18.36
linux linux kernel6.19 and later · before 7.0.13
linux linux kernel7.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	bpftool	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-abi-stablelists	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-core	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-cross-headers	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-debug	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-debug-core	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-debug-devel	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-debug-modules	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-debug-modules-extra	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-devel	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-doc	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-headers	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-modules	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-modules-extra	before 4.18.0-553.164.1.el8_10	4.18.0-553.164.1.el8_10
AlmaLinux:8	kernel-rt	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-core	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-debug	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-debug-core	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-debug-devel	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-debug-modules	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-debug-modules-extra	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-devel	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10
AlmaLinux:8	kernel-rt-modules	before 4.18.0-553.164.1.rt7.505.el8_10	4.18.0-553.164.1.rt7.505.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-53273Jun 25, 2026 · tee: optee: prevent use-after-free when the client exits before the supplicant
31Monitor
← EarlierCVE-2026-53274Jun 25, 2026 · net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
22Monitor
Later →CVE-2026-53277Jun 25, 2026 · KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	087dbacf897c020f438f780f0a4a8aa73b6d7c5a	Vendor (CNA)
Linux Linux	1354271c89d0e5fbf8b3d94097ff0216695209c7	Vendor (CNA)
Linux Linux	2a613bf497029d555a7428406aa8cdb84a503cea	Vendor (CNA)
Linux Linux	4203806f700bb44ea0b05d484d9d40044b47fb04	Vendor (CNA)
Linux Linux	53baa63a4183291574483f89583dbef13677a2c4	Vendor (CNA)
Linux Linux	791c91dc7a9dfb2457d5e29b8216a6484b9c4b40	Vendor (CNA)
Linux Linux	b2eb8886200b907fc71806869620609f0f4cacb0	Vendor (CNA)
Linux Linux	dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea	Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.0	6.6.143.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
almalinux:kernel	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-core	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-core	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-devel	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-modules	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-modules-core	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-devel	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
almalinux:kernel-64k-devel-matched	5.14.0-687.46.1.el9_8 · AlmaLinux:9	Package registry (OSV)
debian:linux	6.1.176-1 · Debian:12	Package registry (OSV)
red hat:kernel-64k-debug-debuginfo	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-64k-debug-devel	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-64k-debug-devel-matched	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-64k-debuginfo	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-64k-devel	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-64k-devel-matched	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:kernel-debug-devel	0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Someone on the same network segment can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log (2)

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/087dbacf897c020f438f780f0a4a8aa73b6d7c5a

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records