In the Linux kernel, the following vulnerability has been resolved:
btrfs: zlib: fix the folio leak on S390 hardware acceleration
[BUG] After commit aa60fe12b4f4 ("btrfs: zlib: refactor S390x HW acceleration buffer preparation"), we no longer release the folio of the page cache of folio returned by btrfs_compress_filemap_get_folio() for S390 hardware acceleration path.
[CAUSE] Before that commit, we call kumap_local() and folio_put() after handling each folio.
Although the timing is not ideal (it release previous folio at the beginning of the loop, and rely on some extra cleanup out of the loop), it at least handles the folio release correctly.
Meanwhile the refactored code is easier to read, it lacks the call to release the filemap folio.
[FIX] Add the missing folio_put() for copy_data_into_buffer().
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 |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Feb 14, 2026 |
| Ubuntu | — | Upgrade linux-image-oem-24.04dUpgrade linux-image-gcp-6.17Upgrade linux-image-6.17.0-1019-oracle-64kUpgrade linux-image-oem-24.04bUpgrade linux-image-azure-fde-6.17Upgrade linux-image-oem-24.04aUpgrade linux-image-6.17.0-1021-gcpUpgrade linux-image-nvidia-64k-6.17Upgrade linux-image-gcpUpgrade linux-image-6.17.0-1018-realtimeUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-64k-hwe-24.04Upgrade linux-image-oem-6.17Upgrade linux-image-oracleUpgrade linux-image-6.17.0-1019-oracleUpgrade linux-image-oracle-6.17Upgrade linux-image-oem-24.04cUpgrade linux-image-nvidia-6.17Upgrade linux-image-6.17.0-1018-azure-fdeUpgrade linux-image-6.17.0-1030-oemUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-oracle-64kUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-nvidia-hwe-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-azure-6.17Upgrade linux-image-6.17.0-1031-nvidia-64kUpgrade linux-image-6.17.0-1031-nvidiaUpgrade linux-image-6.17.0-1021-azureUpgrade linux-image-6.17.0-1021-gcp-64kUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-realtime-6.17Upgrade linux-image-azure-fdeUpgrade linux-image-azure | Jul 21, 2026 | Jul 20, 2026 |
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