Heimdall Security Logo

CVE-2026-98380

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.18.55, 0, <39b751a210bf61a374afa82749afc7a77a08bf1d, <dd80a7519824b72c8fcfd3cc50cb93f7e2d90923, <259caa711b7688365676442e2fdb286b8aceaa80, 4.19, <a9551f26287debe6d8aa6e8841974661065b975f, 6.12.112, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, <c82b797abe668d0b668601a93ba2c0b071a63574, 6.1.189, <=6.18.*, 5.15.222, <6bf076258aac4e0af69ef317656c31ce6444d647, <=7.2.*, <6c9f07bf8800171de2cd3f02815cebe1f4d45f2d, <4.19, 7.2.9, <=*, <=5.15.*, 0190c1d452a91c38a3462abdd81752be1b9006a8, <968550a439f64bd1a6c0d88efb92e4f082f84a26, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: reject IDR error pointers when deleting actions tcf_action_delete() drops the reference held by its lookup before calling tcf_idr_delete_index() with the saved action index. An unlocked classifier can remove that action and reserve the same IDR slot with ERR_PTR(-EBUSY) in between. tcf_idr_delete_index() only checks the lookup result for NULL. It therefore treats the reservation as a tc_action and dereferences tcfa_bindcnt. A hardware execution breakpoint was used to schedule the interleaving without changing the kernel source. KASAN reported this decoded trace: BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010 Read of size 4 at addr 0000000000000010 by task poc/150 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002 RIP: tca_action_gd+0x5c0/0x1010: arch_atomic_read at arch/x86/include/asm/atomic.h:23 raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457 atomic_read at include/linux/atomic/atomic-instrumented.h:33 tcf_idr_delete_index at net/sched/act_api.c:766 tcf_action_delete at net/sched/act_api.c:1859 tcf_del_notify at net/sched/act_api.c:2014 tca_action_gd at net/sched/act_api.c:2064 R13: 0000000000000010 R15: fffffffffffffff0 Kernel panic - not syncing: Fatal exception R15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces the address in R13. With the guard applied, the same reproducer returned -ENOENT without a KASAN report or panic. Treat error pointers as absent and return -ENOENT.

Gravité et risque d'exploitation

CVE-2026-98380 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.18 %, ce qui la place devant 6.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.18.55, 0, <39b751a210bf61a374afa82749afc7a77a08bf1d, <dd80a7519824b72c8fcfd3cc50cb93f7e2d90923, <259caa711b7688365676442e2fdb286b8aceaa80, 4.19, <a9551f26287debe6d8aa6e8841974661065b975f, 6.12.112, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, <c82b797abe668d0b668601a93ba2c0b071a63574, 6.1.189, <=6.18.*, 5.15.222, <6bf076258aac4e0af69ef317656c31ce6444d647, <=7.2.*, <6c9f07bf8800171de2cd3f02815cebe1f4d45f2d, <4.19, 7.2.9, <=*, <=5.15.*, 0190c1d452a91c38a3462abdd81752be1b9006a8, <968550a439f64bd1a6c0d88efb92e4f082f84a26, 7.3) 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