CVE-2026-52954

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-52954", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.372Z", "datePublished": "2026-06-24T16:28:36.992Z", "dateUpdated": "2026-10-19T19:47:09.795Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:04.179Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: handle rbtree insertion error in decode_choose_args()\n\nA message of type CEPH_MSG_OSD_MAP contains an OSD map that itself\ncontains a CRUSH map. The received CRUSH map may optionally contain\nchoose_args that get decoded in decode_choose_args(). In this function,\nnum_choose_arg_maps is read from the message, and a corresponding number\nof crush_choose_arg_maps gets decoded afterwards. Each\ncrush_choose_arg_map has a choose_args_index, which serves as the key\nwhen inserting it into the choose_args rbtree of the decoded crush_map.\nIf a (potentially corrupted) message contains two crush_choose_arg_maps\nwith the same index, the assertion in insert_choose_arg_map() triggers a\nkernel BUG when trying to insert the second crush_choose_arg_map.\n\nThis patch fixes the issue by switching to the non-asserting rbtree\ninsertion function and rejecting the message if the insertion fails.\n\n[ idryomov: changelog ]"}], "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 vulnerable decoder processes CEPH_MSG_OSD_MAP data received over the Ceph network protocol from monitor or OSD peers.\nAC:L - An attacker controlling an accepted Ceph peer can deterministically include two choose_arg_maps with the same choose_args_index; no race or special memory state is required.\nPR:N - In the highest reasonable scenario, a malicious or compromised Ceph cluster endpoint sends the malformed map to an already connected client and needs no privileges on the victim system.\nUI:N - OSD map updates are processed asynchronously by the kernel client after the Ceph session exists; no victim action is needed to process the malicious message.\nS:U - The impact is within the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug triggers a BUG() assertion on duplicate rbtree insertion and does not provide an information disclosure primitive.\nI:N - The vulnerable path does not perform attacker-controlled memory corruption; it aborts via BUG() before creating an integrity-impacting primitive.\nA:H - The duplicate choose_args_index triggers a kernel BUG/oops in the Ceph client decode path, causing a high-impact 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/osdmap.c"], "versions": [{"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "c7bf7864e2924fa5508ac270b0e9364bc13d5a6c", "status": "affected", "versionType": "git"}, {"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "f47430fc1f815e87406e2d3b4e476eff1bc7fd9b", "status": "affected", "versionType": "git"}, {"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da", "status": "affected", "versionType": "git"}, {"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "534ebc08df97c47d4c7596f336fa31ecbf91519c", "status": "affected", "versionType": "git"}, {"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "80c73bd1b2b04355d1d0c29be8ccbd25a380905d", "status": "affected", "versionType": "git"}, {"version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", 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"status": "unaffected", "versionType": "semver"}, {"version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "4.13", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b"}, {"url": "https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da"}, {"url": "https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c"}, {"url": "https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d"}, {"url": "https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8"}, {"url": "https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3"}, {"url": "https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded"}], "title": "libceph: handle rbtree insertion error in decode_choose_args()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52954", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:23:24.439949Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:47:09.795Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52954", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:23:24.439949Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:23:24.969Z"}}], "cna": {"title": "libceph: handle rbtree insertion error in decode_choose_args()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable decoder processes CEPH_MSG_OSD_MAP data received over the Ceph network protocol from monitor or OSD peers.\nAC:L - An attacker controlling an accepted Ceph peer can deterministically include two choose_arg_maps with the same choose_args_index; no race or special memory state is required.\nPR:N - In the highest reasonable scenario, a malicious or compromised Ceph cluster endpoint sends the malformed map to an already connected client and needs no privileges on the victim system.\nUI:N - OSD map updates are processed asynchronously by the kernel client after the Ceph session exists; no victim action is needed to process the malicious message.\nS:U - The impact is within the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug triggers a BUG() assertion on duplicate rbtree insertion and does not provide an information disclosure primitive.\nI:N - The vulnerable path does not perform attacker-controlled memory corruption; it aborts via BUG() before creating an integrity-impacting primitive.\nA:H - The duplicate choose_args_index triggers a kernel BUG/oops in the Ceph client decode path, causing a high-impact denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "c7bf7864e2924fa5508ac270b0e9364bc13d5a6c", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "f47430fc1f815e87406e2d3b4e476eff1bc7fd9b", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "534ebc08df97c47d4c7596f336fa31ecbf91519c", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "80c73bd1b2b04355d1d0c29be8ccbd25a380905d", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "4d2b37abda9536808655830d683dc491d31741a8", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "0a1265a9ab875f92b6a3ffb497404f46cf9d76a3", "versionType": "git"}, {"status": "affected", "version": "5cf9c4a9959b6273675310d14a834ef14fbca37c", "lessThan": "d289478cfc0bcf81c7914200d6abdcb78bd04ded", "versionType": "git"}], "programFiles": ["net/ceph/osdmap.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.13"}, {"status": "unaffected", "version": "0", "lessThan": "4.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.141", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.91", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.33", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ceph/osdmap.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c"}, {"url": "https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b"}, {"url": "https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da"}, {"url": "https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c"}, {"url": "https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d"}, {"url": "https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8"}, {"url": "https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3"}, {"url": "https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: handle rbtree insertion error in decode_choose_args()\n\nA message of type CEPH_MSG_OSD_MAP contains an OSD map that itself\ncontains a CRUSH map. The received CRUSH map may optionally contain\nchoose_args that get decoded in decode_choose_args(). In this function,\nnum_choose_arg_maps is read from the message, and a corresponding number\nof crush_choose_arg_maps gets decoded afterwards. Each\ncrush_choose_arg_map has a choose_args_index, which serves as the key\nwhen inserting it into the choose_args rbtree of the decoded crush_map.\nIf a (potentially corrupted) message contains two crush_choose_arg_maps\nwith the same index, the assertion in insert_choose_arg_map() triggers a\nkernel BUG when trying to insert the second crush_choose_arg_map.\n\nThis patch fixes the issue by switching to the non-asserting rbtree\ninsertion function and rejecting the message if the insertion fails.\n\n[ idryomov: changelog ]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.141", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.91", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.33", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.10", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "4.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:04.179Z"}}}, "cveMetadata": {"cveId": "CVE-2026-52954", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:47:09.795Z", "dateReserved": "2026-06-09T07:44:35.372Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-24T16:28:36.992Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The received CRUSH map may optionally contain\nchoose_args that get decoded in decode_choose_args(). In this function,\nnum_choose_arg_maps is read from the message, and a corresponding number\nof crush_choose_arg_maps gets decoded afterwards. Each\ncrush_choose_arg_map has a choose_args_index, which serves as the key\nwhen inserting it into the choose_args rbtree of the decoded crush_map.\nIf a (potentially corrupted) message contains two crush_choose_arg_maps\nwith the same index, the assertion in insert_choose_arg_map() triggers a\nkernel BUG when trying to insert the second crush_choose_arg_map.\n\nThis patch fixes the issue by switching to the non-asserting rbtree\ninsertion function and rejecting the message if the insertion fails.\n\n[ idryomov: changelog ]"}], "id": "CVE-2026-52954", "lastModified": "2026-10-19T20:18:50.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52954", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:23:24.439949Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:05.530", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: libceph: handle rbtree insertion error in decode_choose_args()", "id": "2492449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492449"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["A flaw was found in the Linux kernel's libceph component. A remote attacker could send a specially crafted CEPH_MSG_OSD_MAP message containing a corrupted CRUSH map. If this map includes two crush_choose_arg_maps with identical indices, it triggers an assertion failure, leading to a kernel bug and a system crash. This vulnerability results in a denial of service (DoS)."], "name": "CVE-2026-52954", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52954\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52954\nhttps://lore.kernel.org/linux-cve-announce/2026062435-CVE-2026-52954-05b2@gregkh/T"], "threat_severity": "Moderate"}

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