{"id":"CVE-2026-80528","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80528","summary":"ceph: avoid fs reclaim while using current->journal_info","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: avoid fs reclaim while using current->journal_info\n\nhandle_reply() stores a `ceph_mds_request` pointer in\n`current->journal_info` while filling the inode and dentry cache from\nan MDS reply.\n\nAn allocation in this section can enter direct reclaim and prune\ndentries from another filesystem.  If this dirties an ext4 inode, ext4\nstarts a JBD2 transaction.  JBD2 interprets the Ceph request in\n`current->journal_info` as a journal handle and dereferences the\nrequest's `r_tid` as `h_transaction`, causing a kernel crash, e.g.:\n\n Unable to handle kernel paging request at virtual address 00000000077b4818\n [...]\n Internal error: Oops: 0000000096000004 [#1]  SMP\n Modules linked in:\n CPU: 6 UID: 0 PID: 2699135 Comm: kworker/6:3 Tainted: G        W           6.18.38-i3 #1113 NONE\n [...]\n Workqueue: ceph-msgr ceph_con_workfn\n pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : jbd2__journal_start+0x2c/0x208\n lr : __ext4_journal_start_sb+0x100/0x178\n [...]\n Call trace:\n  jbd2__journal_start+0x2c/0x208 (P)\n  __ext4_journal_start_sb+0x100/0x178\n  ext4_dirty_inode+0x3c/0x90\n  __mark_inode_dirty+0x58/0x400\n  iput.part.0+0x2b0/0x370\n  iput+0x18/0x30\n  dentry_unlink_inode+0xc0/0x158\n  __dentry_kill+0x80/0x250\n  shrink_dentry_list+0x90/0x130\n  prune_dcache_sb+0x60/0x98\n  super_cache_scan+0xe8/0x190\n  do_shrink_slab+0x174/0x388\n  shrink_slab+0xd8/0x4c0\n  shrink_node+0x31c/0x908\n  do_try_to_free_pages+0xd0/0x508\n  try_to_free_pages+0x11c/0x238\n  __alloc_frozen_pages_noprof+0x4d0/0xdd0\n  __folio_alloc_noprof+0x18/0x70\n  __filemap_get_folio+0x248/0x440\n  ceph_readdir_prepopulate+0x570/0x9e8\n  mds_dispatch+0x1424/0x1ba0\n  ceph_con_process_message+0x74/0xa0\n  ceph_con_v1_try_read+0x3a0/0x1510\n  ceph_con_workfn+0x260/0x460\n\nEnter a scoped NOFS allocation context and leave it after clearing\n`journal_info`.  This prevents filesystem reclaim from recursing into\nanother filesystem while the field contains Ceph-private data.","published":"2026-08-26T14:37:06.781Z","modified":"2026-08-28T03:47:28.914911343Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.266"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00c12f57a87f537fa8779258fb3a03003a99963e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/47b745747b3aa39064724a642884f9df924ddf20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4dbb2c02558e71f93510a6461d7e798b67426b49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b602344a49e039e792ce5a8923bcc61412ee134"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79d95b43ca090426399651ed580dd9bf2db36ab8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6a0989613072499633e761a1536428a466de7d3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8a21660c3b90864c391164eea5622e7b5b2897c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca5fa2380dd90a0adb01580fa6225025351a90f6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80528.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80528"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T03:47:28.914911343Z"}}