CVE-2026-80528
Received Received - Intake

Kernel Crash in Linux Kernel Due to Journal Handling

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: kernel.org

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.

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Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-08-26
AI Q&A
2026-08-26
EPSS Evaluated
N/A
NVD
CVE-2026-80528
EUVD
EUVD-2026-66594

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ceph ceph *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a flaw in the Ceph filesystem handling. When processing MDS replies, the kernel stores a ceph_mds_request pointer in current->journal_info. If a memory allocation triggers direct reclaim, it can prune dentries from another filesystem, potentially dirtying an ext4 inode. This causes JBD2 to misinterpret the Ceph request as a journal handle, leading to a kernel crash due to dereferencing invalid memory.

Detection Guidance

This vulnerability is specific to the Linux kernel's Ceph filesystem handling. Detection requires checking kernel logs for crashes or oopses related to JBD2 or ext4 operations, particularly when Ceph is in use. Look for errors like 'Unable to handle kernel paging request' or 'Oops' in system logs.

Impact Analysis

This vulnerability can cause a kernel crash (oops) on affected systems, leading to system instability or denial of service. Systems using both Ceph and ext4 filesystems are particularly vulnerable. The crash occurs during filesystem operations, potentially corrupting data or requiring a reboot to recover.

Mitigation Strategies

Apply the latest kernel update that includes the fix for this issue. If immediate patching is not possible, consider disabling Ceph filesystem operations temporarily or restricting access to Ceph services until the patch is applied.

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