CVE-2026-80528 (GCVE-0-2026-80528)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
Title
ceph: avoid fs reclaim while using current->journal_info
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < ca5fa2380dd90a0adb01580fa6225025351a90f6 (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < 00c12f57a87f537fa8779258fb3a03003a99963e (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < 4dbb2c02558e71f93510a6461d7e798b67426b49 (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < c8a21660c3b90864c391164eea5622e7b5b2897c (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < 47b745747b3aa39064724a642884f9df924ddf20 (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < 79d95b43ca090426399651ed580dd9bf2db36ab8 (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < b6a0989613072499633e761a1536428a466de7d3 (git)
Affected: 315f24088048a51eed341c53be66ea477a3c7d16 , < 5b602344a49e039e792ce5a8923bcc61412ee134 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/mds_client.c"
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              "version": "5.15.217",
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: avoid fs reclaim while using current-\u003ejournal_info\n\nhandle_reply() stores a `ceph_mds_request` pointer in\n`current-\u003ejournal_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-\u003ejournal_info` as a journal handle and dereferences the\nrequest\u0027s `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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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-\u003ejournal_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-\u003ejournal_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:23.093Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ca5fa2380dd90a0adb01580fa6225025351a90f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/00c12f57a87f537fa8779258fb3a03003a99963e"
        },
        {
          "url": "https://git.kernel.org/stable/c/4dbb2c02558e71f93510a6461d7e798b67426b49"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8a21660c3b90864c391164eea5622e7b5b2897c"
        },
        {
          "url": "https://git.kernel.org/stable/c/47b745747b3aa39064724a642884f9df924ddf20"
        },
        {
          "url": "https://git.kernel.org/stable/c/79d95b43ca090426399651ed580dd9bf2db36ab8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6a0989613072499633e761a1536428a466de7d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b602344a49e039e792ce5a8923bcc61412ee134"
        }
      ],
      "title": "ceph: avoid fs reclaim while using current-\u003ejournal_info",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80528",
    "datePublished": "2026-08-26T14:37:06.781Z",
    "dateReserved": "2026-08-26T14:34:25.764Z",
    "dateUpdated": "2026-08-27T05:01:23.093Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80528",
      "date": "2026-08-27",
      "epss": "0.00521",
      "percentile": "0.42041"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80528\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-26T15:17:06.667\",\"lastModified\":\"2026-08-27T06:17:32.740\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nceph: avoid fs reclaim while using current-\u003ejournal_info\\n\\nhandle_reply() stores a `ceph_mds_request` pointer in\\n`current-\u003ejournal_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-\u003ejournal_info` as a journal handle and dereferences the\\nrequest\u0027s `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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ceph/mds_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"ca5fa2380dd90a0adb01580fa6225025351a90f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"00c12f57a87f537fa8779258fb3a03003a99963e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"4dbb2c02558e71f93510a6461d7e798b67426b49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"c8a21660c3b90864c391164eea5622e7b5b2897c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"47b745747b3aa39064724a642884f9df924ddf20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"79d95b43ca090426399651ed580dd9bf2db36ab8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"b6a0989613072499633e761a1536428a466de7d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"315f24088048a51eed341c53be66ea477a3c7d16\",\"lessThan\":\"5b602344a49e039e792ce5a8923bcc61412ee134\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ceph/mds_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00c12f57a87f537fa8779258fb3a03003a99963e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47b745747b3aa39064724a642884f9df924ddf20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4dbb2c02558e71f93510a6461d7e798b67426b49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b602344a49e039e792ce5a8923bcc61412ee134\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79d95b43ca090426399651ed580dd9bf2db36ab8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6a0989613072499633e761a1536428a466de7d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8a21660c3b90864c391164eea5622e7b5b2897c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca5fa2380dd90a0adb01580fa6225025351a90f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T14:54:57+00:00",
      "cve": "CVE-2026-80528",
      "id": "CVE-2026-80528",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ceph: avoid fs reclaim while using current-\u003ejournal_info",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80528.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.