{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23136", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.971Z", "datePublished": "2026-02-14T15:22:21.952Z", "dateUpdated": "2026-08-05T12:20:20.637Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:20.637Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: reset sparse-read state in osd_fault()\n\nWhen a fault occurs, the connection is abandoned, reestablished, and any\npending operations are retried. The OSD client tracks the progress of a\nsparse-read reply using a separate state machine, largely independent of\nthe messenger's state.\n\nIf a connection is lost mid-payload or the sparse-read state machine\nreturns an error, the sparse-read state is not reset. The OSD client\nwill then interpret the beginning of a new reply as the continuation of\nthe old one. If this makes the sparse-read machinery enter a failure\nstate, it may never recover, producing loops like:\n\n libceph: [0] got 0 extents\n libceph: data len 142248331 != extent len 0\n libceph: osd0 (1)...:6801 socket error on read\n libceph: data len 142248331 != extent len 0\n libceph: osd0 (1)...:6801 socket error on read\n\nTherefore, reset the sparse-read state in osd_fault(), ensuring retries\nstart from a clean state." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The Ceph OSD client communicates with OSD servers over TCP. A network-level attacker who can disrupt the TCP connection (RST injection) or a malicious/compromised OSD server can trigger the fault during a sparse read operation remotely.\nAC:L - Sparse reads are a normal part of CephFS/RBD operation. An attacker who can disrupt TCP connections can repeatedly do so until one coincides with a sparse read. A malicious OSD server knows exactly when sparse reads are in progress and can reliably trigger the fault.\nPR:N - The attack requires disrupting the TCP connection between client and OSD, which does not require any Ceph authentication credentials. TCP RST injection or network-level connection disruption bypasses CephX authentication entirely.\nUI:N - No user interaction is required. The sparse read operations occur as part of normal CephFS/RBD I/O, and the connection fault is triggered by the attacker without any victim action.\nS:U - The impact is confined to the kernel's Ceph client losing access to the OSD. There is no cross-boundary impact such as VM escape or sandbox escape.\nC:N - The vulnerability causes a data parsing mismatch that is caught by validation checks, returning clean errors. No information disclosure occurs — the stale state causes misinterpretation of reply framing, not exposure of memory contents.\nI:N - No data modification or memory corruption occurs. The validation checks in the sparse read state machine detect the mismatch and return -EREMOTEIO before any data is written to incorrect locations.\nA:H - The OSD connection enters an infinite, unrecoverable error loop where every retry fails with the same stale state mismatch. All CephFS/RBD I/O to the affected OSD hangs or fails indefinitely, causing persistent denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osd_client.c" ], "versions": [ { "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "90a60fe61908afa0eaf7f8fcf1421b9b50e5f7ff", "status": "affected", "versionType": "git" }, { "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "e94075e950a6598e710b9f7dffea5aa388f40313", "status": "affected", "versionType": "git" }, { "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "10b7c72810364226f7b27916ea3e2a4f870bc04b", "status": "affected", "versionType": "git" }, { "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "11194b416ef95012c2cfe5f546d71af07b639e93", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osd_client.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.121", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.66", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.6", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "6.6", "versionEndExcluding": "6.6.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/90a60fe61908afa0eaf7f8fcf1421b9b50e5f7ff" }, { "url": "https://git.kernel.org/stable/c/e94075e950a6598e710b9f7dffea5aa388f40313" }, { "url": "https://git.kernel.org/stable/c/10b7c72810364226f7b27916ea3e2a4f870bc04b" }, { "url": "https://git.kernel.org/stable/c/11194b416ef95012c2cfe5f546d71af07b639e93" } ], "title": "libceph: reset sparse-read state in osd_fault()", "x_generator": { "engine": "bippy-1.2.0" } } } }