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CVE-2026-98567

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 184c449f91fef521042970cca46bd5cdfc0e3a37, <=6.12.*, <1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81, 6.18.55, 0, <6ea8f643053f33622f9116e4e1db58306ece45e3, <4.10, <9e841723ba482d41ecbf90241c756a16cdfea949, <4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910, 5.10.271, 6.12.112, 6.6.158, <=5.10.*, <=6.6.*, 4.10, 6.1.189, <967e10f40a0c6732db299cbe001df0e859196055, <2cc1c3977acbffc417fb5b57699d1df3dcffb5fd, 5.15.222, <=6.18.*, <=7.2.*, 7.2.9, <eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f, <=*, <=5.15.*, <930318290d8509e864c015fe6c9239470b3c579c, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: net: xps: reject an out of range traffic class Only the entries below dev->num_tc are valid in dev->tc_to_txq[], and dev->prio_tc_map[] may only name classes below it. netdev_set_num_tc() lowers dev->num_tc without touching either array. netdev_txq_to_tc() walks all TC_MAX_QUEUE slots and netdev_get_prio_tc_map() returns the entry as it stands, so a leftover entry is handed out as a traffic class >= dev->num_tc. Taking that class from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a negative one and indexes an XPS map sized for dev->num_tc classes: tci = j * num_tc + tc; RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); attr_map[] holds nr_ids * num_tc entries and j runs over the ids named in the mask, so a class that is not below num_tc pushes tci past the end of the map for the last ids and the store overruns it. Any caller that lowers num_tc leaves such entries behind, and mqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than netdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7] still describe txq 1..7. The splat is from an XPS write to txq 2 on a veth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and j == 6 stores one past the end of the 88-byte map: BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954) Write of size 8 at addr ffff88813016bc58 by task xps_oob/634 __netif_set_xps_queue (net/core/dev.c:2954) xps_rxqs_store (net/core/net-sysfs.c:1880) netdev_queue_attr_store (net/core/net-sysfs.c:1390) Allocated by task 634: __kmalloc_noprof (mm/slub.c:5439) __netif_set_xps_queue (net/core/dev.c:2937) The buggy address is located 0 bytes to the right of allocated 88-byte region [ffff88813016bc00, ffff88813016bc58) Reject a class the map has no room for.

Gravité et risque d'exploitation

CVE-2026-98567 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 0.21 %, ce qui la place devant 10.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 184c449f91fef521042970cca46bd5cdfc0e3a37, <=6.12.*, <1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81, 6.18.55, 0, <6ea8f643053f33622f9116e4e1db58306ece45e3, <4.10, <9e841723ba482d41ecbf90241c756a16cdfea949, <4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910, 5.10.271, 6.12.112, 6.6.158, <=5.10.*, <=6.6.*, 4.10, 6.1.189, <967e10f40a0c6732db299cbe001df0e859196055, <2cc1c3977acbffc417fb5b57699d1df3dcffb5fd, 5.15.222, <=6.18.*, <=7.2.*, 7.2.9, <eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f, <=*, <=5.15.*, <930318290d8509e864c015fe6c9239470b3c579c, 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

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