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In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix possible badness in FREE_STATEID
When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors.
In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | May 13, 2026 | Oct 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-6.11.0-1009-azureUpgrade linux-image-genericUpgrade linux-image-azureUpgrade linux-image-awsUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-raspiUpgrade linux-image-azure-fdeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-oracleUpgrade linux-image-realtimeUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-oracle-64kUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-oem-24.04bUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-24.04Upgrade linux-image-virtualUpgrade linux-image-generic-64kUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-generic-hwe-24.04 | Feb 20, 2025 | Oct 21, 2024 |
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