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CVE-2026-68159

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 5.15.217, 0, <=7.1.*, <ebdf4b4f3b1474079980a2e5cd79ad65fb54db57, <d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1, <4daf06456677177f2a6044729abac59c1b49e87b, <66eec4af1e080b695229c9a20635648a6d12fedf, <9f00f9cf2be293efe899db67dc5272e3a9c62717, <=5.10.*, <=6.6.*, 4.13, 5.10.266, 7.1.6, <=6.18.*, 6.1.184, a303bb0e58345fe9f7ab2f82b90266f2b5036058, <4.13, <590b07ceea138d49c9b64f65d263aa902d3b4730, <42bc06c67d94d5f2a6b33294b0c4b07d8a47c515, <=*, <=5.15.*, 6.6.153, 6.12.105, 6.18.46, 7.2, <e36663145abd7024f0281dfb22fdef65f185845b

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE __decode_pg_temp() decodes an user-controlled length but only rejects values large enough to overflow the allocation; it does not bound it to CEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and apply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size on-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends an OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack out-of-bounds write. An OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer entries at decode time. The bound is well below the old overflow threshold, so it also covers the allocation-size overflow the previous check guarded against. BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds Write of size 4 ... by task exploit kasan_report (mm/kasan/report.c:595) ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833) calc_target (net/ceph/osd_client.c:1638) __submit_request (net/ceph/osd_client.c:2394) ceph_osdc_start_request (net/ceph/osd_client.c:2490) ceph_osdc_call (net/ceph/osd_client.c:5164) rbd_dev_image_probe (drivers/block/rbd.c:6899) do_rbd_add (drivers/block/rbd.c:7138) ... kernel BUG at net/ceph/osdmap.c:2670! [ idryomov: do the same in __decode_pg_upmap_items() ]

Gravité et risque d'exploitation

CVE-2026-68159 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.74 %, ce qui la place devant 53.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.15.217, 0, <=7.1.*, <ebdf4b4f3b1474079980a2e5cd79ad65fb54db57, <d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1, <4daf06456677177f2a6044729abac59c1b49e87b, <66eec4af1e080b695229c9a20635648a6d12fedf, <9f00f9cf2be293efe899db67dc5272e3a9c62717, <=5.10.*, <=6.6.*, 4.13, 5.10.266, 7.1.6, <=6.18.*, 6.1.184, a303bb0e58345fe9f7ab2f82b90266f2b5036058, <4.13, <590b07ceea138d49c9b64f65d263aa902d3b4730, <42bc06c67d94d5f2a6b33294b0c4b07d8a47c515, <=*, <=5.15.*, 6.6.153, 6.12.105, 6.18.46, 7.2, <e36663145abd7024f0281dfb22fdef65f185845b) 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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