In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix use-after-free by using call_rcu() for oplock_info
ksmbd currently frees oplock_info immediately using kfree(), even though it is accessed under RCU read-side critical sections in places like opinfo_get() and proc_show_files().
Since there is no RCU grace period delay between nullifying the pointer and freeing the memory, a reader can still access oplock_info structure after it has been freed. This can leads to a use-after-free especially in opinfo_get() where atomic_inc_not_zero() is called on already freed memory.
Fix this by switching to deferred freeing using call_rcu().
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-6.17.0-1017-realtimeUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.17.0-1026-nvidiaUpgrade linux-image-6.17.0-40-genericUpgrade linux-image-raspiUpgrade linux-image-aws-6.17Upgrade linux-image-realtimeUpgrade linux-image-oem-24.04Upgrade linux-image-aws-64k-6.17Upgrade linux-image-nvidia-6.17Upgrade linux-image-6.17.0-1019-awsUpgrade linux-image-oracleUpgrade linux-image-nvidia-hwe-24.04Upgrade linux-image-generic-64k-6.17Upgrade linux-image-gcp-64kUpgrade linux-image-6.17.0-1028-oemUpgrade linux-image-azureUpgrade linux-image-azure-fde-6.17Upgrade linux-image-nvidia-64k-hwe-24.04Upgrade linux-image-generic-64kUpgrade linux-image-genericUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-aws-64kUpgrade linux-image-6.17.0-1018-oracle-64kUpgrade linux-image-6.17.0-1021-raspiUpgrade linux-image-6.17.0-1018-oracleUpgrade linux-image-6.17.0-1019-aws-64kUpgrade linux-image-raspi-6.17Upgrade linux-image-azure-fdeUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64k-6.17Upgrade linux-image-generic-6.17Upgrade linux-image-oem-24.04cUpgrade linux-image-oem-24.04aUpgrade linux-image-6.17.0-40-generic-64kUpgrade linux-image-6.17.0-1020-gcp-64kUpgrade linux-image-6.17.0-1020-gcpUpgrade linux-image-virtualUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-azure-6.17Upgrade linux-image-awsUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.17.0-1026-nvidia-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.17.0-1018-azure-fdeUpgrade linux-image-gcpUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-24.04bUpgrade linux-image-gcp-6.17Upgrade linux-image-oem-24.04dUpgrade linux-image-realtime-6.17Upgrade linux-image-oem-6.17Upgrade linux-image-6.17.0-1021-azureUpgrade linux-image-oracle-6.17Upgrade linux-image-virtual-6.17 | Jul 1, 2026 | May 8, 2026 |
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