{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68158", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.371Z", "datePublished": "2026-08-10T11:59:24.675Z", "dateUpdated": "2026-08-19T16:30:30.014Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:30.014Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix multiplication overflow in decode_new_up_state_weight()\n\nIf a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted\nosdmap, out-of-bounds memory accesses may occur in\ndecode_new_up_state_weight(). This happens because the bounds check for\nthe new_state part is based on calculating its length depending on a len\nvalue read from the incoming message. This calculation may overflow\nleading to an incorrect bounds check. Subsequently, out-of-bounds reads\nmay occur when decoding this part.\n\nThis patch switches the multiplication to use check_mul_overflow() to\nabort processing the osdmap if an overflow occurred. Therefore,\nosdmaps/messages containing large values for len that result in a\nmultiplication overflow are treated as invalid.\n\n[ idryomov: rename new_state_len -> new_state_item_size, formatting ]" } ], "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 - Malformed incremental osdmap data is delivered in CEPH_MSG_OSD_MAP over TCP from a Ceph monitor (mon_dispatch) or OSD (osd_dispatch) to libceph clients (CephFS/RBD), and the overflow is triggered while decoding received network bytes in osdmap_apply_incremental().\nAC:L - A compromised or attacker-controlled monitor/OSD can publish an incremental osdmap with epoch N+1 and a crafted new_state length that wraps the multiply, reliably bypassing bounds checks without races or victim-specific memory layout.\nPR:N - Exploitation requires no privileges on the victim host; a malicious cluster peer or on-path attacker that can deliver forged osdmaps to an already-connected kernel Ceph client needs no local account, capabilities, or user-namespace tricks.\nUI:N - Once a host is a Ceph client, osdmap subscriptions and updates are applied automatically by the kernel; no additional mount, open, or interactive step is needed at exploit time beyond the existing client session.\nS:U - Impact is confined to kernel memory and libceph client state on the Ceph client host (info leak, map corruption, crash, or privilege escalation); it does not cross VM, IOMMU, or sandbox boundaries to another security authority.\nC:H - Integer-overflow bypass lets decode_new_up_state_weight() run bare ceph_decode_32/8 loops past the message end, performing out-of-bounds reads of adjacent kernel heap/slack memory that can disclose pointers and other sensitive data.\nI:H - Misaligned decoding also drives attacker-controlled osd/xorstate/weight values into map->osd_weight[], map->osd_state[], and map->osd_addr[] updates (including memset), corrupting kernel osdmap state in ways usable for further exploitation.\nA:H - Unbounded out-of-bounds reads while parsing osdmaps can fault on unmapped pages and trigger kernel oops/panic; map corruption can also cause persistent client failure, repeatable on each malicious incremental map." } ] } ], "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": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "2ceee3b77b83052648c40fef965f836fd7699d26", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "e4473751cc37db41f3f7da25d64a23e0c74570f1", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "f6961070c326bd158c38fa48756cde2bd78c4aaa", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "05c90e059269f087becfcce23348496085835c29", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "143ba49ead77ec483c0326f8aaad8649874e99c4", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "1732d89dfcd74f6fde9ce70900d316c4a151c153", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "bee4b5b53e7bff0467fd916cc44c9b190733c6bd", "status": "affected", "versionType": "git" }, { "version": "930c532869774ebf8af9efe9484c597f896a7d46", "lessThan": "98917a499ec7064c14fc56d180a4fd636fc2784c", "status": "affected", "versionType": "git" }, { "version": "1196c36fd53c3b1615eb02f986cb727b1dfc1047", "status": "affected", "versionType": "git" }, { "version": "bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196", "status": "affected", "versionType": "git" }, { "version": "6b96b2d473701b45df3fea8dd9796b6ec39e6d54", "status": "affected", "versionType": "git" }, { "version": "7405d73cea0d0e6c541f5c534078feeb46188844", "status": "affected", "versionType": "git" }, { "version": "8777c9f654637d56f4c4ca54eb1bc7c609b70085", "status": "affected", "versionType": "git" }, { "version": "6831c98ce0b8a3e88db64aa224372effd0dcc694", "status": "affected", "versionType": "git" }, { "version": "032951d32c13b7564dfba82758260cb7aa1149d2", "status": "affected", "versionType": "git" }, { "version": "14877928f10667a5606383885d004f7185f33718", "status": "affected", "versionType": "git" }, { "version": "3.10.103", "lessThan": "3.11", "status": "affected", "versionType": "semver" }, { "version": "3.12.63", "lessThan": "3.13", "status": "affected", "versionType": "semver" }, { "version": "3.14.75", "lessThan": "3.15", "status": "affected", "versionType": "semver" }, { "version": "3.16.39", "lessThan": "3.17", "status": "affected", "versionType": "semver" }, { "version": "3.18.39", "lessThan": "3.19", "status": "affected", "versionType": "semver" }, { "version": "4.1.30", "lessThan": "4.2", "status": "affected", "versionType": "semver" }, { "version": "4.4.17", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.6.6", "lessThan": "4.7", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osdmap.c" ], "versions": [ { "version": "4.7", "status": "affected" }, { "version": "0", "lessThan": "4.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "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": "4.7", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.63" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2ceee3b77b83052648c40fef965f836fd7699d26" }, { "url": "https://git.kernel.org/stable/c/e4473751cc37db41f3f7da25d64a23e0c74570f1" }, { "url": "https://git.kernel.org/stable/c/f6961070c326bd158c38fa48756cde2bd78c4aaa" }, { "url": "https://git.kernel.org/stable/c/05c90e059269f087becfcce23348496085835c29" }, { "url": "https://git.kernel.org/stable/c/143ba49ead77ec483c0326f8aaad8649874e99c4" }, { "url": "https://git.kernel.org/stable/c/1732d89dfcd74f6fde9ce70900d316c4a151c153" }, { "url": "https://git.kernel.org/stable/c/bee4b5b53e7bff0467fd916cc44c9b190733c6bd" }, { "url": "https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c" } ], "title": "libceph: Fix multiplication overflow in decode_new_up_state_weight()", "x_generator": { "engine": "bippy-1.2.0" } } } }