{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80528",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80528"
  ],
  "published": "2026-08-26T14:37:59Z",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80528"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca5fa2380dd90a0adb01580fa6225025351a90f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00c12f57a87f537fa8779258fb3a03003a99963e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4dbb2c02558e71f93510a6461d7e798b67426b49"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c8a21660c3b90864c391164eea5622e7b5b2897c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47b745747b3aa39064724a642884f9df924ddf20"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/79d95b43ca090426399651ed580dd9bf2db36ab8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6a0989613072499633e761a1536428a466de7d3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b602344a49e039e792ce5a8923bcc61412ee134"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T05:18:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The crash path runs in the ceph-msgr kworker handling CEPH_MSG_CLIENT_REPLY from the MDS over TCP; on Ceph/Rook/Kubernetes nodes with cephfs mounted, a compromised or malicious MDS peer drives handle_reply() remotely without requiring a victim syscall.\nAC:L - A MDS peer can supply large readdir/lookup replies to force GFP_KERNEL allocations in ceph_fill_trace/ceph_readdir_prepopulate while journal_info is set, making direct reclaim into ext4 dentry pruning likely without rare kernel configs or uncontrollable heap layout.\nPR:N - Exploitation requires no Linux UID, capability, or init-namespace root on the victim; any kernel cephfs client already connected to an attacker-controlled or compromised cluster suffices, consistent with other MDS-reply client CVEs (e.g., CVE-2026-80527).\nUI:N - Once cephfs is mounted (standard in Ceph deployments), MDS replies are processed automatically in kworker context; attackers need not induce a victim to mount media or perform a one-off interactive step at exploitation time.\nS:U - Impact is a kernel oops from JBD2 mistyping current->journal_info on the same host; it does not cross VM, container, or IOMMU boundaries to another security authority.\nC:H - While journal_info holds a ceph_mds_request pointer, ext4 reclaim invokes jbd2__journal_start(), type-confusing that object as a journal handle and dereferencing r_tid as h_transaction\u2014a cross-subsystem type confusion with kernel-pointer read potential per CNA memory-safety guidance.\nI:H - Type confusion of current->journal_info between Ceph and JBD2 misinterprets live ceph_mds_request fields as journal-handle metadata during MDS reply processing; kernel CNA guidance classes type confusion as High integrity impact even when the immediate fault is an oops.\nA:H - The reported ARM64 oops in jbd2__journal_start() from invalid h_transaction dereference reliably crashes the ceph-msgr worker and can panic the node; reclaim during MDS reply handling enables repeated remote-triggered denial-of-service."
    }
  }
}