{ "cveId": "CVE-2026-90260", "url": "https://patchblox.com/security/cve/CVE-2026-90260", "summary": "CVE-2026-90260 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-90260, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "btrfs: zoned: don\u0027t clobber the extent buffer when zeroing it out", "description": "In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: don\u0027t clobber the extent buffer when zeroing it out On a zoned filesystem a freed-but-still-dirty tree block is written out as zeros (EXTENT_BUFFER_ZONED_ZEROOUT) only to keep the zone write pointer advancing. btree_csum_one_bio() implemented this by memzeroing the extent buffer\u0027s own folios before submission. That destroys the in-memory buffer while it may still be referenced. In particular btrfs_free_tree_block() can run on it afterwards and reads the header to add a delayed reference; once the header has been zeroed it frees bytenr 0 and corrupts the extent tree (the btrfs_header_bytenr(buf) != 0 ASSERT in btrfs_free_tree_block(), or an \u0022unable to find ref\u0022 abort). It is flaky and reproduces under fsstress, e.g. generic/461 and generic/013. Write the zeros to disk from the shared zero page instead and leave the extent buffer content untouched, so any later reference - including the delayed reference from btrfs_free_tree_block() - still sees a valid header. end_bbio_meta_write() now clears writeback on the buffer\u0027s own folios, as the bio no longer carries them.", "published": "2026-09-17T17:17:22Z", "severity": "high", "cvss": 7.1, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "epss": 0.0016, "epssPercentile": 0.05192, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90260", "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.54-121.166", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-headers", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.12.115-2", "fix": "DEBIAN-CVE-2026-90260", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90260", "released": "2026-09-23T19:19:02Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.6-1", "fix": "DEBIAN-CVE-2026-90260", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90260", "released": "2026-09-23T19:19:02Z" }, { "platform": "linux", "product": "microvm-kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T19:12:23Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }