In the Linux kernel, the following vulnerability has been resolved:
btrfs: zoned: fix calc_available_free_space() for zoned mode
calc_available_free_space() returns the total size of metadata (or system) block groups, which can be allocated from unallocated disk space. The logic is wrong on zoned mode in two places.
First, the calculation of data_chunk_size is wrong. We always allocate one zone as one chunk, and no partial allocation of a zone. So, we should use zone_size (= data_sinfo->chunk_size) as it is.
Second, the result "avail" may not be zone aligned. Since we always allocate one zone as one chunk on zoned mode, returning non-zone size aligned bytes will result in less pressure on the async metadata reclaim process.
This is serious for the nearly full state with a large zone size device. Allowing over-commit too much will result in less async reclaim work and end up in ENOSPC. We can align down to the zone size to avoid that.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Ubuntu | — | Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1014-raspiUpgrade linux-image-ibmUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-48-lowlatency-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1016-oemUpgrade linux-image-oem-22.04bUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.8.0-1017-gcpUpgrade linux-image-awsUpgrade linux-image-6.8.0-1015-oracle-64kUpgrade linux-image-azureUpgrade linux-image-6.8.0-1018-awsUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-48-generic-64kUpgrade linux-image-virtualUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.8.0-1016-azureUpgrade linux-image-6.8.0-48-genericUpgrade linux-image-ibm-classicUpgrade linux-image-oracle-64kUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1017-nvidia-64kUpgrade linux-image-oem-24.04aUpgrade linux-image-gcpUpgrade linux-image-6.8.0-1017-nvidia-lowlatencyUpgrade linux-image-6.8.0-1017-azureUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-6.8.0-1016-azure-fdeUpgrade linux-image-6.8.0-1017-azure-fdeUpgrade linux-image-6.8.0-1014-ibmUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1017-nvidiaUpgrade linux-image-6.8.0-1002-gkeopUpgrade linux-image-6.8.0-1016-gcpUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-gkeUpgrade linux-image-6.8.0-1017-nvidia-lowlatency-64kUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oem-22.04aUpgrade linux-image-raspiUpgrade linux-image-generic-64kUpgrade linux-image-gkeopUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-lowlatencyUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1013-gkeUpgrade linux-image-genericUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-48-lowlatencyUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-6.8.0-1015-oracleUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-64k-6.8 | Nov 4, 2024 | Jul 30, 2024 |
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