{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80528", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.764Z", "datePublished": "2026-08-26T14:37:06.781Z", "dateUpdated": "2026-10-16T19:26:24.829Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T05:01:23.093Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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->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—a 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ceph/mds_client.c" ], "versions": [ { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "ca5fa2380dd90a0adb01580fa6225025351a90f6", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "00c12f57a87f537fa8779258fb3a03003a99963e", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "4dbb2c02558e71f93510a6461d7e798b67426b49", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "c8a21660c3b90864c391164eea5622e7b5b2897c", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "47b745747b3aa39064724a642884f9df924ddf20", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "79d95b43ca090426399651ed580dd9bf2db36ab8", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "b6a0989613072499633e761a1536428a466de7d3", "status": "affected", "versionType": "git" }, { "version": "315f24088048a51eed341c53be66ea477a3c7d16", "lessThan": "5b602344a49e039e792ce5a8923bcc61412ee134", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ceph/mds_client.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.153", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.105", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2" } ] } ] } ], "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->journal_info", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80528", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:16:38.118673Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:24.829Z" } } ] } }