{"id":"CVE-2024-26685","summary":"nilfs2: fix potential bug in end_buffer_async_write","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential bug in end_buffer_async_write\n\nAccording to a syzbot report, end_buffer_async_write(), which handles the\ncompletion of block device writes, may detect abnormal condition of the\nbuffer async_write flag and cause a BUG_ON failure when using nilfs2.\n\nNilfs2 itself does not use end_buffer_async_write().  But, the async_write\nflag is now used as a marker by commit 7f42ec394156 (\"nilfs2: fix issue\nwith race condition of competition between segments for dirty blocks\") as\na means of resolving double list insertion of dirty blocks in\nnilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the\nresulting crash.\n\nThis modification is safe as long as it is used for file data and b-tree\nnode blocks where the page caches are independent.  However, it was\nirrelevant and redundant to also introduce async_write for segment summary\nand super root blocks that share buffers with the backing device.  This\nled to the possibility that the BUG_ON check in end_buffer_async_write\nwould fail as described above, if independent writebacks of the backing\ndevice occurred in parallel.\n\nThe use of async_write for segment summary buffers has already been\nremoved in a previous change.\n\nFix this issue by removing the manipulation of the async_write flag for\nthe remaining super root block buffer.","modified":"2026-04-02T10:05:30.645580Z","published":"2024-04-03T14:54:47.688Z","related":["SUSE-SU-2024:1490-1","SUSE-SU-2024:1659-1","SUSE-SU-2024:1663-1","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26685.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c3bdba00283a6c7a5b19481a59a730f46063803"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5bc09b397cbf1221f8a8aacb1152650c9195b02b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/626daab3811b772086aef1bf8eed3ffe6f523eff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6589f0f72f8edd1fa11adce4eedbd3615f2e78ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8fa90634ec3e9cc50f42dd605eec60f2d146ced8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4a09fdac625e64abe478dcf88bfa20406616928"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d31c8721e816eff5ca6573cc487754f357c093cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3e4963566f58726d3265a727116a42b591f6596"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26685.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26685"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7f42ec3941560f0902fe3671e36f2c20ffd3af0a"},{"fixed":"c4a09fdac625e64abe478dcf88bfa20406616928"},{"fixed":"d31c8721e816eff5ca6573cc487754f357c093cd"},{"fixed":"f3e4963566f58726d3265a727116a42b591f6596"},{"fixed":"8fa90634ec3e9cc50f42dd605eec60f2d146ced8"},{"fixed":"6589f0f72f8edd1fa11adce4eedbd3615f2e78ab"},{"fixed":"2c3bdba00283a6c7a5b19481a59a730f46063803"},{"fixed":"626daab3811b772086aef1bf8eed3ffe6f523eff"},{"fixed":"5bc09b397cbf1221f8a8aacb1152650c9195b02b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"ccebcc74c81d8399c7b204aea47c1f33b09c2b17"},{"last_affected":"831c87640d23ccb253a02e4901bd9a325b5e8c2d"},{"last_affected":"d8974c7fe717ee8fb0706e35cc92e0bcdf660ec5"},{"last_affected":"8f67918af09fc0ffd426a9b6f87697976d3fbc7b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26685.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}