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CVE-2026-90071

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : 0bad9c86edd22dec4df83c2b29872d66fd8a2ff4, <6.6.157, <=6.1.*, <=6.12.*, <5.15.221, 6.12.78, 5.15.221, 6b1f563d670162e188a0f2aec39c24b67b106e17, 5.10.270, 0, <00d8a387b23b7831ad9919256a6b9caaa10f19c3, 7.0, 6.1.188, 6.18.52, 383493b9940e3d1b5517424081b3e072e20ec43c, 59b06d8b9bdb6b64b3c534c18da68bce5ccd31be, 6.18.19, <=5.10.*, <=6.6.*, <1360bc93f5be1be3cf937ebea667b3418dd30a79, <7.0, 6.6.157, <dc4b95b8fee95113587e93ca116356032d271371, 5.15.203, 7.2.6, <6.20, 6.19.9, <012559cf3c67ce8825a31d4f66b040b6fbaf775e, <=6.18.*, <5.10.270, 6.1.167, <0cd75037948567193f7f5767176538822ce23873, 7.3, 6.12.110, <=7.2.*, <6.12.110, <6.18.52, <=*, 81a43e8005366f16e629d8c95dfe05beaa8d36a7, 5.10.253, <=5.15.*, <d453bf439ef230b5743afc25e194adacca8c6e43, 21ea283c2750c8307aa35ee832b0951cc993c27d, 6.6.130, <96bc345a3f17543d0d92ada609e02198d6380e26, <6.1.188, 0cc0c2e661af418bbf7074179ea5cfffc0a5c466, 57c153249143333bbf4ecf927bdf8aa2696ee397, <aa39a790d56b40bfcf3861653ceb46a3a113adb6

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_teql: restore skb->dev on the slave failure path teql_master_xmit() sets skb->dev = slave before calling the slave's ndo_start_xmit(), but never restores it when that transmit fails. The skb then walks on to the next slave still pointing at the previous one. If a later slave has no resolved neighbour, teql_resolve() hands the skb to neigh_event_send(), which queues it on that neighbour's arp_queue with the stale skb->dev. skb->dev holds no reference, so deleting the previous slave frees the net_device while the skb is still queued. Whatever runs next on that skb - arp_error_report() on timeout, or neigh_direct_output() -> dev_queue_xmit() once the neighbour resolves - causes a UAF like the one below: BUG: KASAN: slab-use-after-free in __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) Read of size 4 at addr ffff888106e100b0 by task flood_packet/527 CPU: 0 UID: 0 PID: 527 Comm: flood_packet Not tainted 7.2.0-rc6-g594d90519502 #1 PREEMPT(lazy) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) ? __pfx__raw_spin_lock_irqsave (./include/asm-generic/qrwlock.h:122 (discriminator 4)) ? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) kasan_report (mm/kasan/report.c:595) ? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) [...] ipv4_link_failure (net/ipv4/route.c:1251 net/ipv4/route.c:1258) ? __pfx_ipv4_link_failure (./include/linux/skbuff.h:4327) ? _raw_write_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qrwlock.h:98 ./include/linux/rwlock_api_smp.h:230 kernel/locking/spinlock.c:304) ? __pfx__raw_write_lock (kernel/locking/spinlock.c:175) arp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:296) neigh_invalidate (net/core/neighbour.c:1077) neigh_timer_handler (net/core/neighbour.c:1169) [...] Allocated by task 505: kasan_save_stack (mm/kasan/common.c:57) kasan_save_track (mm/kasan/common.c:78) __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415) __kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5334 mm/slub.c:6905) alloc_netdev_mqs (net/core/dev.c:12055 (discriminator 2)) rtnl_create_link (net/core/rtnetlink.c:3721) rtnl_newlink (net/core/rtnetlink.c:3903 net/core/rtnetlink.c:4044 net/core/rtnetlink.c:4159) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) [...] Freed by task 536: 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:2677 mm/slub.c:6377 mm/slub.c:6692) device_release (drivers/base/core.c:2636) kobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737) netdev_run_todo (net/core/dev.c:11756) rtnl_dellink (net/core/rtnetlink.c:157 ./include/linux/rtnetlink.h:135 net/core/rtnetlink.c:3651) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) [...] Fix this by restoring skb->dev to the master at the end of each slave's iteration.

Gravité et risque d'exploitation

CVE-2026-90071 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 0bad9c86edd22dec4df83c2b29872d66fd8a2ff4, <6.6.157, <=6.1.*, <=6.12.*, <5.15.221, 6.12.78, 5.15.221, 6b1f563d670162e188a0f2aec39c24b67b106e17, 5.10.270, 0, <00d8a387b23b7831ad9919256a6b9caaa10f19c3, 7.0, 6.1.188, 6.18.52, 383493b9940e3d1b5517424081b3e072e20ec43c, 59b06d8b9bdb6b64b3c534c18da68bce5ccd31be, 6.18.19, <=5.10.*, <=6.6.*, <1360bc93f5be1be3cf937ebea667b3418dd30a79, <7.0, 6.6.157, <dc4b95b8fee95113587e93ca116356032d271371, 5.15.203, 7.2.6, <6.20, 6.19.9, <012559cf3c67ce8825a31d4f66b040b6fbaf775e, <=6.18.*, <5.10.270, 6.1.167, <0cd75037948567193f7f5767176538822ce23873, 7.3, 6.12.110, <=7.2.*, <6.12.110, <6.18.52, <=*, 81a43e8005366f16e629d8c95dfe05beaa8d36a7, 5.10.253, <=5.15.*, <d453bf439ef230b5743afc25e194adacca8c6e43, 21ea283c2750c8307aa35ee832b0951cc993c27d, 6.6.130, <96bc345a3f17543d0d92ada609e02198d6380e26, <6.1.188, 0cc0c2e661af418bbf7074179ea5cfffc0a5c466, 57c153249143333bbf4ecf927bdf8aa2696ee397, <aa39a790d56b40bfcf3861653ceb46a3a113adb6) 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

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