CVE-2026-80528ceph: avoid fs reclaim while using current->journal_info
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In the Linux kernel, the following vulnerability has been resolved: ceph: avoid fs reclaim while using current->journal_info handle_reply() stores a `ceph_mds_request` pointer in `current->journal_info` while filling the inode and dentry cache from an MDS reply. An allocation in this section can enter direct reclaim and prune dentries from another filesystem. If this dirties an ext4 inode, ext4 starts a JBD2 transaction. JBD2 interprets the Ceph request in `current->journal_info` as a journal handle and dereferences the request's `r_tid` as `h_transaction`, causing a kernel crash, e.g.: Unable to handle kernel paging request at virtual address 00000000077b4818 [...] Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 6 UID: 0 PID: 2699135 Comm: kworker/6:3 Tainted: G W 6.18.38-i3 #1113 NONE [...] Workqueue: ceph-msgr ceph_con_workfn pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : jbd2__journal_start+0x2c/0x208 lr : __ext4_journal_start_sb+0x100/0x178 [...] Call trace: jbd2__journal_start+0x2c/0x208 (P) __ext4_journal_start_sb+0x100/0x178 ext4_dirty_inode+0x3c/0x90 __mark_inode_dirty+0x58/0x400 iput.part.0+0x2b0/0x370 iput+0x18/0x30 dentry_unlink_inode+0xc0/0x158 __dentry_kill+0x80/0x250 shrink_dentry_list+0x90/0x130 prune_dcache_sb+0x60/0x98 super_cache_scan+0xe8/0x190 do_shrink_slab+0x174/0x388 shrink_slab+0xd8/0x4c0 shrink_node+0x31c/0x908 do_try_to_free_pages+0xd0/0x508 try_to_free_pages+0x11c/0x238 __alloc_frozen_pages_noprof+0x4d0/0xdd0 __folio_alloc_noprof+0x18/0x70 __filemap_get_folio+0x248/0x440 ceph_readdir_prepopulate+0x570/0x9e8 mds_dispatch+0x1424/0x1ba0 ceph_con_process_message+0x74/0xa0 ceph_con_v1_try_read+0x3a0/0x1510 ceph_con_workfn+0x260/0x460 Enter a scoped NOFS allocation context and leave it after clearing `journal_info`. This prevents filesystem reclaim from recursing into another filesystem while the field contains Ceph-private data.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 315f24088048a51eed341c53be66ea477a3c7d16 before ca5fa2380dd90a0adb01580fa6225025351a90f6; 315f24088048a51eed341c53be66ea477a3c7d16 builds before 00c12f57a87f537fa8779258fb3a03003a99963e; 315f24088048a51eed341c53be66ea477a3c7d16 builds before 4dbb2c02558e71f93510a6461d7e798b67426b49; from 315f24088048a51eed341c53be66ea477a3c7d16 before c8a21660c3b90864c391164eea5622e7b5b2897c; 315f24088048a51eed341c53be66ea477a3c7d16 builds before 47b745747b3aa39064724a642884f9df924ddf20; 315f24088048a51eed341c53be66ea477a3c7d16 builds before 79d95b43ca090426399651ed580dd9bf2db36ab8; from 315f24088048a51eed341c53be66ea477a3c7d16 before b6a0989613072499633e761a1536428a466de7d3; 315f24088048a51eed341c53be66ea477a3c7d16 builds before 5b602344a49e039e792ce5a8923bcc61412ee134 | CNA record |
References
- https://git.kernel.org/stable/c/ca5fa2380dd90a0adb01580fa6225025351a90f6
- https://git.kernel.org/stable/c/00c12f57a87f537fa8779258fb3a03003a99963e
- https://git.kernel.org/stable/c/4dbb2c02558e71f93510a6461d7e798b67426b49
- https://git.kernel.org/stable/c/c8a21660c3b90864c391164eea5622e7b5b2897c
- https://git.kernel.org/stable/c/47b745747b3aa39064724a642884f9df924ddf20
- https://git.kernel.org/stable/c/79d95b43ca090426399651ed580dd9bf2db36ab8
- https://git.kernel.org/stable/c/b6a0989613072499633e761a1536428a466de7d3
- https://git.kernel.org/stable/c/5b602344a49e039e792ce5a8923bcc61412ee134
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.