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CVE-2026-53275

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.8 · Élevée
EPSS 0.3%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 5.10.269, 0, 6.1.176, 97300b5fdfe28c6edae926926f9467a27cf5889c, 5.15.210, <dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea, <=5.10.*, <=6.6.*, 7.0.13, <087dbacf897c020f438f780f0a4a8aa73b6d7c5a, <2a613bf497029d555a7428406aa8cdb84a503cea, <b2eb8886200b907fc71806869620609f0f4cacb0, 6.18.36, 7.1, <2.6.15, <=6.18.*, <4203806f700bb44ea0b05d484d9d40044b47fb04, <1354271c89d0e5fbf8b3d94097ff0216695209c7, <53baa63a4183291574483f89583dbef13677a2c4, 2.6.15, <=*, <=5.15.*, 6.6.143, <791c91dc7a9dfb2457d5e29b8216a6484b9c4b40

Description

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)

Gravité et risque d'exploitation

CVE-2026-53275 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.26 %, ce qui la place devant 16.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 5.10.269, 0, 6.1.176, 97300b5fdfe28c6edae926926f9467a27cf5889c, 5.15.210, <dfaf1f5e7eb81be87582bd6a57d34e61a57d5dea, <=5.10.*, <=6.6.*, 7.0.13, <087dbacf897c020f438f780f0a4a8aa73b6d7c5a, <2a613bf497029d555a7428406aa8cdb84a503cea, <b2eb8886200b907fc71806869620609f0f4cacb0, 6.18.36, 7.1, <2.6.15, <=6.18.*, <4203806f700bb44ea0b05d484d9d40044b47fb04, <1354271c89d0e5fbf8b3d94097ff0216695209c7, <53baa63a4183291574483f89583dbef13677a2c4, 2.6.15, <=*, <=5.15.*, 6.6.143, <791c91dc7a9dfb2457d5e29b8216a6484b9c4b40) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE