In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin().
However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to dereference is the one specified by ->no_unlock_folio as ownership immediately reverts to the caller.
Fix this by storing the folio pointer instead and using that rather than the index. Also fix netfs_unlock_read_folio() where the same applies.
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 |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-headersUpgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.18-modules-extraUpgrade kernel6.18-modules-extra-commonUpgrade microvm-kernel6.18Upgrade kernel6.18Upgrade bpftool6.18Upgrade perf6.18-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade kernel6.18-develUpgrade perf6.18Upgrade python3-perf6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-livepatch-6.18.35-68.127Upgrade kernel6.18-tools-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64 | Aug 18, 2026 | Jul 24, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Aug 30, 2026 | Aug 30, 2026 |
| Ubuntu | — | Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-azureUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-aws-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-raspiUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1009-awsUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-bosUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-nvidiaUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-oracleUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-azure-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-raspi-realtime | Jul 28, 2026 | Jul 28, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 15, 2026 | Jul 24, 2026 |
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