{"id":"CVE-2026-43359","title":"btrfs: fix transaction abort on set received ioctl due to item overflow","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix transaction abort on set received ioctl due to item overflow\n\nIf the set received ioctl fails due to an item overflow when attempting to\nadd the BTRFS_UUID_K…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b9914db13ac15aca3b74544c0bb1a2e0dad1f174","Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b19c0465e4daad5aa8f60552ea0578cf31a11b1e","Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5","Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < d11aefe654a04fc41996d254748d6a38b6b0a7be","Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 41fb97353ff58fa4f31904c343fc8e3df2f7517d","Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 87f2c46003fce4d739138aab4af1942b1afdadac","Linux 3.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:36:21.571725Z"},"published":"2026-05-08","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:42:50.278Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43359","references":[{"url":"https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174"},{"url":"https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e"},{"url":"https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5"},{"url":"https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be"},{"url":"https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d"},{"url":"https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.02041,"ingestedAt":"2026-11-06T15:54:03.932Z","slug":"CVE-2026-43359","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix transaction abort on set received ioctl due to item overflow\n\nIf the set received ioctl fails due to an item overflow when attempting to\nadd the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction\nsince we did some metadata updates before.\n\nThis means that if a user calls this ioctl with the same received UUID\nfield for a lot of subvolumes, we will hit the overflow, trigger the\ntransaction abort and turn the filesystem into RO mode. A malicious user\ncould exploit this, and this ioctl does not even requires that a user\nhas admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.\n\nFix this by doing an early check for item overflow before starting a\ntransaction. This is also race safe because we are holding the subvol_sem\nsemaphore in exclusive (write) mode.\n\nA test case for fstests will follow soon.\n\n## Affected\n\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b9914db13ac15aca3b74544c0bb1a2e0dad1f174`\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < b19c0465e4daad5aa8f60552ea0578cf31a11b1e`\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5`\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < d11aefe654a04fc41996d254748d6a38b6b0a7be`\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 41fb97353ff58fa4f31904c343fc8e3df2f7517d`\n- `Linux >= dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 < 87f2c46003fce4d739138aab4af1942b1afdadac`\n- `Linux 3.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}