Answer in brief
CVE-2026-53275 records a High severity (CVSS 8.8) vulnerability in ipv6: mcast: Fix use-after-free when processing MLD queries. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=97300b5fdfe28c6edae926926f9467a27cf5889c <dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea || >=97300b5fdfe28c6edae926926f9467a27cf5889c <1354271c89d0e5fbf8b3d94097ff0216695209c7 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <53baa63a4183291574483f89583dbef13677a2c4 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <2a613bf497029d555a7428406aa8cdb84a503cea || >=97300b5fdfe28c6edae926926f9467a27cf5889c <b2eb8886200b907fc71806869620609f0f4cacb0 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <4203806f700bb44ea0b05d484d9d40044b47fb04 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <087dbacf897c020f438f780f0a4a8aa73b6d7c5a || >=97300b5fdfe28c6edae926926f9467a27cf5889c <791c91dc7a9dfb2457d5e29b8216a6484b9c4b40 | dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea, 1354271c89d0e5fbf8b3d94097ff0216695209c7, 53baa63a4183291574483f89583dbef13677a2c4, 2a613bf497029d555a7428406aa8cdb84a503cea, b2eb8886200b907fc71806869620609f0f4cacb0, 4203806f700bb44ea0b05d484d9d40044b47fb04, 087dbacf897c020f438f780f0a4a8aa73b6d7c5a, 791c91dc7a9dfb2457d5e29b8216a6484b9c4b40 |
| Linux/Linuxgeneric | 2.6.15 | Not reported |
| Linux/Linuxgeneric | >=97300b5fdfe28c6edae926926f9467a27cf5889c <1354271c89d0e5fbf8b3d94097ff0216695209c7 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <53baa63a4183291574483f89583dbef13677a2c4 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <2a613bf497029d555a7428406aa8cdb84a503cea || >=97300b5fdfe28c6edae926926f9467a27cf5889c <b2eb8886200b907fc71806869620609f0f4cacb0 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <4203806f700bb44ea0b05d484d9d40044b47fb04 || >=97300b5fdfe28c6edae926926f9467a27cf5889c <087dbacf897c020f438f780f0a4a8aa73b6d7c5a || >=97300b5fdfe28c6edae926926f9467a27cf5889c <791c91dc7a9dfb2457d5e29b8216a6484b9c4b40 | 1354271c89d0e5fbf8b3d94097ff0216695209c7, 53baa63a4183291574483f89583dbef13677a2c4, 2a613bf497029d555a7428406aa8cdb84a503cea, b2eb8886200b907fc71806869620609f0f4cacb0, 4203806f700bb44ea0b05d484d9d40044b47fb04, 087dbacf897c020f438f780f0a4a8aa73b6d7c5a, 791c91dc7a9dfb2457d5e29b8216a6484b9c4b40 |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.7 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.7 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.7 <* | * |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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)
Quoted source text, attributed separately from HOL analysis.