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CVE-2026-90189

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <dbcedbe4819ae21274ea77469e61e46a878b9943, <=6.1.*, <=6.12.*, <c9d293d6bb0575fcb1f3408129453187e2a28a4e, 0, 6.1.188, 6.18.52, <=6.6.*, 6.6.157, <57debc907aef66319d244009d3370dcd97388d37, 7.2.6, <=6.18.*, 6.12.110, <=7.2.*, 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa, <d761be1b8f2bbabc41252deb79a426d3f0d4fa10, <=*, <4.14, <cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36, <2679b11e9256bd70a5ef41783bab6ad6c34a3db1, 4.14, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: null_blk: register configfs subsystem after creating default devices In null_init(), configfs_register_subsystem() currently runs before register_blkdev(), so when null_blk is built as a module, a racing mkdir() + poweron from userspace can reach null_add_dev() while null_major is still 0. __add_disk() then hits WARN_ON(disk->minors) (major=0 with minors!=0) and fails: [root@fedora ~]# [ 2366.521436] WARNING: block/genhd.c:476 at __add_disk+0x8a7/0xde0, [ 2366.523552] Modules linked in: null_blk(+) nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib [ 2366.529081] CPU: 26 UID: 0 PID: 1600 Comm: sh Not tainted 7.2.0-rc1+ #66 PREEMPT(full) ...... [ 2366.547251] Call Trace: [ 2366.547575] <TASK> [ 2366.547831] ? _raw_spin_lock+0x84/0xe0 [ 2366.548260] add_disk_fwnode+0x114/0x560 [ 2366.548739] null_add_dev+0x102d/0x1b80 [null_blk] [ 2366.549310] ? __pfx_null_add_dev+0x10/0x10 [null_blk] [ 2366.549906] ? mutex_lock+0xde/0x1c0 [ 2366.550361] ? __pfx_mutex_lock+0x10/0x10 [ 2366.550827] nullb_device_power_store+0x1e7/0x280 [null_blk] [ 2366.551499] ? __pfx_nullb_device_power_store+0x10/0x10 [null_blk] [ 2366.552177] ? __kmalloc_cache_noprof+0x1f5/0x470 [ 2366.552748] ? configfs_write_iter+0x35c/0x4e0 [ 2366.553242] configfs_write_iter+0x286/0x4e0 [ 2366.553787] vfs_write+0x52d/0xd00 [ 2366.554169] ? __pfx_vfs_write+0x10/0x10 [ 2366.554679] ? __pfx___css_rstat_updated+0x10/0x10 [ 2366.555196] ? fdget_pos+0x1cf/0x4c0 [ 2366.555649] ksys_write+0xfc/0x1d0 ...... Additionally, the err_dev path destroys all devices on nullb_list while configfs is still registered. If a racing mkdir() + poweron puts a user device on the list, null_destroy_dev()->null_free_dev() kfrees the user device's nullb_device but /sys/kernel/config/nullb/<name> is still reachable. Any userspace access to the item will trigger a UAF. For simplicity, move configfs_register_subsystem() to the end to solve the problems above.

Gravité et risque d'exploitation

CVE-2026-90189 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 0.17 %, ce qui la place devant 6.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <dbcedbe4819ae21274ea77469e61e46a878b9943, <=6.1.*, <=6.12.*, <c9d293d6bb0575fcb1f3408129453187e2a28a4e, 0, 6.1.188, 6.18.52, <=6.6.*, 6.6.157, <57debc907aef66319d244009d3370dcd97388d37, 7.2.6, <=6.18.*, 6.12.110, <=7.2.*, 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa, <d761be1b8f2bbabc41252deb79a426d3f0d4fa10, <=*, <4.14, <cab9bf5f68f76cd44e0ec92bd4a60c9b83656a36, <2679b11e9256bd70a5ef41783bab6ad6c34a3db1, 4.14, 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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