High 8.8Published Jun 25, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:00 PM ET)

Does this affect you?

It affects Linux and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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)

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 97300b5fdfe28c6edae926926f9467a27cf5889c before dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea; from 97300b5fdfe28c6edae926926f9467a27cf5889c before 1354271c89d0e5fbf8b3d94097ff0216695209c7; 97300b5fdfe28c6edae926926f9467a27cf5889c builds before 53baa63a4183291574483f89583dbef13677a2c4; 97300b5fdfe28c6edae926926f9467a27cf5889c builds before 2a613bf497029d555a7428406aa8cdb84a503cea; from 97300b5fdfe28c6edae926926f9467a27cf5889c before b2eb8886200b907fc71806869620609f0f4cacb0; from 97300b5fdfe28c6edae926926f9467a27cf5889c before 4203806f700bb44ea0b05d484d9d40044b47fb04; 97300b5fdfe28c6edae926926f9467a27cf5889c builds before 087dbacf897c020f438f780f0a4a8aa73b6d7c5a; 97300b5fdfe28c6edae926926f9467a27cf5889c builds before 791c91dc7a9dfb2457d5e29b8216a6484b9c4b40	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.15 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea
https://git.kernel.org/stable/c/1354271c89d0e5fbf8b3d94097ff0216695209c7	patch
https://git.kernel.org/stable/c/53baa63a4183291574483f89583dbef13677a2c4	patch
https://git.kernel.org/stable/c/2a613bf497029d555a7428406aa8cdb84a503cea	patch
https://git.kernel.org/stable/c/b2eb8886200b907fc71806869620609f0f4cacb0	patch
https://git.kernel.org/stable/c/4203806f700bb44ea0b05d484d9d40044b47fb04	patch
https://git.kernel.org/stable/c/087dbacf897c020f438f780f0a4a8aa73b6d7c5a	patch
https://git.kernel.org/stable/c/791c91dc7a9dfb2457d5e29b8216a6484b9c4b40	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
1–10 of 11

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.