CVE-2026-23047

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23047", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.944Z", "datePublished": "2026-02-04T16:00:29.475Z", "dateUpdated": "2026-05-11T21:58:58.513Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:58:58.513Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: make calc_target() set t->paused, not just clear it\n\nCurrently calc_target() clears t->paused if the request shouldn't be\npaused anymore, but doesn't ever set t->paused even though it's able to\ndetermine when the request should be paused. Setting t->paused is left\nto __submit_request() which is fine for regular requests but doesn't\nwork for linger requests -- since __submit_request() doesn't operate\non linger requests, there is nowhere for lreq->t.paused to be set.\nOne consequence of this is that watches don't get reestablished on\npaused -> unpaused transitions in cases where requests have been paused\nlong enough for the (paused) unwatch request to time out and for the\nsubsequent (re)watch request to enter the paused state. On top of the\nwatch not getting reestablished, rbd_reregister_watch() gets stuck with\nrbd_dev->watch_mutex held:\n\n rbd_register_watch\n __rbd_register_watch\n ceph_osdc_watch\n linger_reg_commit_wait\n\nIt's waiting for lreq->reg_commit_wait to be completed, but for that to\nhappen the respective request needs to end up on need_resend_linger list\nand be kicked when requests are unpaused. There is no chance for that\nif the request in question is never marked paused in the first place.\n\nThe fact that rbd_dev->watch_mutex remains taken out forever then\nprevents the image from getting unmapped -- \"rbd unmap\" would inevitably\nhang in D state on an attempt to grab the mutex."}], "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": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "2b3329b3c29d9e188e40d902d5230c2d5989b940", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "5d0dc83cb9a69c1d0bea58f1c430199b05f6b021", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "4d3399c52e0e61720ae898f5a0b5b75d4460ae24", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "4ebc711b738d139cabe2fc9e7e7749847676a342", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "6f468f6ff233c6a81e0e761d9124e982903fe9a5", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "5647d42c47b535573b63e073e91164d6a5bb058c", "status": "affected", "versionType": "git"}, {"version": "922dab6134178cae317ae00de86376cba59f3147", "lessThan": "c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176", "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": "4.7", "status": "affected"}, {"version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.248", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.198", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.161", "lessThanOrEqual": "6.1.*", "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": "4.7", "versionEndExcluding": "5.10.248"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "5.15.198"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.1.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.6.121"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.12.66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.18.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2b3329b3c29d9e188e40d902d5230c2d5989b940"}, {"url": "https://git.kernel.org/stable/c/5d0dc83cb9a69c1d0bea58f1c430199b05f6b021"}, {"url": "https://git.kernel.org/stable/c/4d3399c52e0e61720ae898f5a0b5b75d4460ae24"}, {"url": "https://git.kernel.org/stable/c/4ebc711b738d139cabe2fc9e7e7749847676a342"}, {"url": "https://git.kernel.org/stable/c/6f468f6ff233c6a81e0e761d9124e982903fe9a5"}, {"url": "https://git.kernel.org/stable/c/5647d42c47b535573b63e073e91164d6a5bb058c"}, {"url": "https://git.kernel.org/stable/c/c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176"}], "title": "libceph: make calc_target() set t->paused, not just clear it", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ceph/osd_client.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2b3329b3c29d9e188e40d902d5230c2d5989b940", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "5d0dc83cb9a69c1d0bea58f1c430199b05f6b021", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "4d3399c52e0e61720ae898f5a0b5b75d4460ae24", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "4ebc711b738d139cabe2fc9e7e7749847676a342", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "6f468f6ff233c6a81e0e761d9124e982903fe9a5", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "5647d42c47b535573b63e073e91164d6a5bb058c", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}, {"lessThan": "c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176", "status": "affected", "version": "922dab6134178cae317ae00de86376cba59f3147", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ceph/osd_client.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.7"}, {"lessThan": "4.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.248", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.198", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.161", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.121", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.66", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: make calc_target() set t->paused, not just clear it\n\nCurrently calc_target() clears t->paused if the request shouldn't be\npaused anymore, but doesn't ever set t->paused even though it's able to\ndetermine when the request should be paused. Setting t->paused is left\nto __submit_request() which is fine for regular requests but doesn't\nwork for linger requests -- since __submit_request() doesn't operate\non linger requests, there is nowhere for lreq->t.paused to be set.\nOne consequence of this is that watches don't get reestablished on\npaused -> unpaused transitions in cases where requests have been paused\nlong enough for the (paused) unwatch request to time out and for the\nsubsequent (re)watch request to enter the paused state. On top of the\nwatch not getting reestablished, rbd_reregister_watch() gets stuck with\nrbd_dev->watch_mutex held:\n\n rbd_register_watch\n __rbd_register_watch\n ceph_osdc_watch\n linger_reg_commit_wait\n\nIt's waiting for lreq->reg_commit_wait to be completed, but for that to\nhappen the respective request needs to end up on need_resend_linger list\nand be kicked when requests are unpaused. There is no chance for that\nif the request in question is never marked paused in the first place.\n\nThe fact that rbd_dev->watch_mutex remains taken out forever then\nprevents the image from getting unmapped -- \"rbd unmap\" would inevitably\nhang in D state on an attempt to grab the mutex."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlibceph: hacer que calc_target() establezca t->paused, no solo lo borre\n\nActualmente, calc_target() borra t->paused si la solicitud ya no deber\u00eda estar en pausa, pero nunca establece t->paused a pesar de que es capaz de determinar cu\u00e1ndo la solicitud deber\u00eda estar en pausa. El establecimiento de t->paused se deja a __submit_request(), lo cual est\u00e1 bien para las solicitudes regulares pero no funciona para las solicitudes persistentes (linger requests) -- ya que __submit_request() no opera en solicitudes persistentes, no hay d\u00f3nde establecer lreq->t.paused. Una consecuencia de esto es que las vigilancias no se restablecen en las transiciones de pausado -> despausado en casos donde las solicitudes han estado en pausa el tiempo suficiente para que la solicitud de desvigilancia (unwatch) (pausada) expire y para que la solicitud de (re)vigilancia (re)watch subsiguiente entre en el estado de pausa. Adem\u00e1s de que la vigilancia no se restablece, rbd_reregister_watch() se queda atascado con rbd_dev->watch_mutex retenido:\n\n rbd_register_watch\n __rbd_register_watch\n ceph_osdc_watch\n linger_reg_commit_wait\n\nEst\u00e1 esperando que lreq->reg_commit_wait se complete, pero para que eso suceda la solicitud respectiva necesita terminar en la lista need_resend_linger y ser activada cuando las solicitudes se despausan. No hay posibilidad de eso si la solicitud en cuesti\u00f3n nunca se marca como pausada en primer lugar.\n\nEl hecho de que rbd_dev->watch_mutex permanezca retenido indefinidamente entonces evita que la imagen se desmapee -- 'rbd unmap' se colgar\u00eda inevitablemente en estado D en un intento de tomar el mutex."}], "id": "CVE-2026-23047", "lastModified": "2026-06-17T10:20:46.180", "metrics": {}, "published": "2026-02-04T16:16:20.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b3329b3c29d9e188e40d902d5230c2d5989b940"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d3399c52e0e61720ae898f5a0b5b75d4460ae24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ebc711b738d139cabe2fc9e7e7749847676a342"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5647d42c47b535573b63e073e91164d6a5bb058c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d0dc83cb9a69c1d0bea58f1c430199b05f6b021"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f468f6ff233c6a81e0e761d9124e982903fe9a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: libceph: make calc_target() set t->paused, not just clear it", "id": "2436815", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436815"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23047", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23047\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23047\nhttps://lore.kernel.org/linux-cve-announce/2026020440-CVE-2026-23047-38d4@gregkh/T"], "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T14:00:03.598462+00:00", "value": {"mitigation_remediation": ["Apply a kernel update that incorporates the libceph patch setting the paused flag correctly.", "If an immediate kernel upgrade is not feasible, stop all RBD mounts or unmount every RBD image until the patch is applied to avoid triggering the deadlock.", "After applying the fix, monitor kernel logs for any reference to \"watch_mutex\" or leftover deadlocks and verify RBD operations operate normally."], "summary": {"action": "Patch Immediately", "impact": "Denial of Service from kernel deadlock during RBD operations"}, "threat_synthesis": {"affected_systems": "The vulnerability exists in the Linux kernel\u2019s Ceph RBD subsystem (libceph). No specific kernel version range is listed, so any kernel build using the affected libceph code is potentially impacted.", "description_and_impact": "The Linux kernel libceph subsystem contains a logic flaw where the function calc_target() fails to set the paused flag for linger requests, only clearing it. This oversight prevents the system from marking certain requests as paused, causing watches to miss the re\u2011establishment of event notifications. As a result, the rbd_dev->watch_mutex remains held indefinitely during an rbd_unmap operation, making the operation hang in a D state and effectively rendering the associated RBD image unusable. The flaw does not crash the kernel but induces a deadlock that freezes key RBD functionalities.", "risk_and_exploitability": "The CVSS base score of 7.0 reflects a moderate\u2011high severity. The EPSS value of < 1% indicates a very low probability of exploitation at the time of analysis, and the vulnerability is not yet present in CISA\u2019s KEV catalog. Exploitation requires the ability to trigger RBD operations such as mounting, unmounting, or sending linger requests, which typically implies local or privileged access. If an attacker can invoke an unmap or a similar action, the kernel can deadlock, resulting in a denial of service that may affect services or applications depending on the affected RBD image. The lack of an unavailable wide\u2011scale exploitation window suggests that the threat remains theoretical but the impact is serious if the situation arises."}}}}, "created": "2026-04-18T14:15:04.104551+00:00", "updated": "2026-04-18T14:15:04.104577+00:00", "vendors": [], "weaknesses": ["CWE-750"]}