CVE-2026-98524
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: rds: ib: Clear the sg list when mapping an MR fails rds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA mapping and registration can fail. On failure, __rds_rdma_map() unpins the pages and frees the scatterlist, but rds_ib_free_frmr() can still return the MR to the pool with the stale pointer set. This leaves the pool with a dangling scatterlist and can lead to local privilege escalation. KASAN detects the resulting use-after-free when the MR is later torn down: BUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr Read of size 8 Call Trace: __rds_ib_teardown_mr rds_ib_unreg_frmr rds_ib_flush_mr_pool rds_ib_flush_mrs rds_free_mr rds_setsockopt Store the scatterlist in the MR only after DMA mapping succeeds. If DMA mapping fails, return directly while the MR fields remain clear; the caller keeps ownership of the scatterlist and its pinned pages. If a later registration step fails, unmap the scatterlist and clear the MR fields before returning.
Gravité et risque d'exploitation
CVE-2026-98524 obtient un score CVSS de 0.0/10, soit une gravité non évaluée.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <c42d316163f89cd23de2f3e24558177a8c29bad8, 6.18.55, 0, <4.6, <b36d32f30c3f1e58e3a5ae79d0f52836a316b36e, 6.12.112, <58eb1b3325edac42dc6df72c80962bd53a3c8ca7, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, 6.1.189, <e2ee0616260080376123997488b5cf8a3870b8d9, 4.6, 1659185fb4d0025835eb2058a141f0746c5cab00, <=6.18.*, 5.15.222, <49ba5ed0129906e0362c2e4b5e21c89b2a41e115, <4468df5bcdef959fd96494e9968f323561a45f4c, 7.3, <=7.2.*, 7.2.9, <=*, <1be3211e6ac77adbb1eac01314d989d243b32c59, <=5.15.*, <8dca3c81344532a7f05edb3d12f31f3009410a90) 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
- https://git.kernel.org/stable/c/1be3211e6ac77adbb1eac01314d989d243b32c59
- https://git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8
- https://git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90
- https://git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115
- https://git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c
- https://git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9
- https://git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e
- https://git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7