In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix extent map leak in NOCOW direct I/O write
btrfs_dio_iomap_begin() calls btrfs_get_extent(), which returns an extent map reference that must be dropped on all exit paths.
For direct writes into a NOCOW range, btrfs_get_blocks_direct_write() keeps using that extent map and asks btrfs_create_dio_extent() to allocate the ordered extent. If that fails, for example because btrfs_alloc_ordered_extent() fails, the function returns the error without dropping the input extent map. The PREALLOC path avoided this by dropping the input extent map before replacing it with the newly created one.
Check the error from btrfs_create_dio_extent() before replacing the map and drop the input extent map on failure.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12Upgrade kernel-livepatch-6.12.111-136.204Upgrade kernel6.12-develUpgrade bpftool6.12-debuginfoUpgrade perf6.12-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-headersUpgrade python3-perf6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade python3-perf6.12-debuginfoUpgrade perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-toolsUpgrade bpftool6.12 | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 11, 2026 |
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