CVE-2026-80528

ceph: avoid fs reclaim while using current->journal_info

State: Published
Severity: 9.8 Critical
Published: Aug 26, 2026
Updated: Oct 16, 2026
Reserved: Aug 26, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	315f24088048a51eed341c53be66ea477a3c7d16 to before ca5fa2380dd90a0adb01580fa6225025351a90f6Affected 315f24088048a51eed341c53be66ea477a3c7d16 to before 00c12f57a87f537fa8779258fb3a03003a99963eAffected 315f24088048a51eed341c53be66ea477a3c7d16 to before 4dbb2c02558e71f93510a6461d7e798b67426b49Affected 315f24088048a51eed341c53be66ea477a3c7d16 to before c8a21660c3b90864c391164eea5622e7b5b2897cAffected 315f24088048a51eed341c53be66ea477a3c7d16 to before 47b745747b3aa39064724a642884f9df924ddf20Affected 315f24088048a51eed341c53be66ea477a3c7d16 to before 79d95b43ca090426399651ed580dd9bf2db36ab8Affected 315f24088048a51eed341c53be66ea477a3c7d16 to before b6a0989613072499633e761a1536428a466de7d3Affected 315f24088048a51eed341c53be66ea477a3c7d16 to before 5b602344a49e039e792ce5a8923bcc61412ee134Affected
LinuxLinux	4.6Affected before 4.6Not affected 5.10.266 through 5.10.Not affected 5.15.217 through 5.15.Not affected 6.1.184 through 6.1.Not affected 6.6.153 through 6.6.Not affected 6.12.105 through 6.12.Not affected 6.18.46 through 6.18.Not affected 7.1.10 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

315f24088048a51eed341c53be66ea477a3c7d16 to before ca5fa2380dd90a0adb01580fa6225025351a90f6Affected
315f24088048a51eed341c53be66ea477a3c7d16 to before 00c12f57a87f537fa8779258fb3a03003a99963eAffected
315f24088048a51eed341c53be66ea477a3c7d16 to before 4dbb2c02558e71f93510a6461d7e798b67426b49Affected
315f24088048a51eed341c53be66ea477a3c7d16 to before c8a21660c3b90864c391164eea5622e7b5b2897cAffected
315f24088048a51eed341c53be66ea477a3c7d16 to before 47b745747b3aa39064724a642884f9df924ddf20Affected
315f24088048a51eed341c53be66ea477a3c7d16 to before 79d95b43ca090426399651ed580dd9bf2db36ab8Affected
315f24088048a51eed341c53be66ea477a3c7d16 to before b6a0989613072499633e761a1536428a466de7d3Affected
315f24088048a51eed341c53be66ea477a3c7d16 to before 5b602344a49e039e792ce5a8923bcc61412ee134Affected

LinuxLinux

4.6Affected
before 4.6Not affected
5.10.266 through 5.10.*Not affected
5.15.217 through 5.15.*Not affected
6.1.184 through 6.1.*Not affected
6.6.153 through 6.6.*Not affected
6.12.105 through 6.12.*Not affected
6.18.46 through 6.18.*Not affected
7.1.10 through 7.1.*Not affected
7.2 and laterNot affected

References

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