CVE-2026-68158 (GCVE-0-2026-68158)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
libceph: Fix multiplication overflow in decode_new_up_state_weight()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix multiplication overflow in decode_new_up_state_weight() If a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted osdmap, out-of-bounds memory accesses may occur in decode_new_up_state_weight(). This happens because the bounds check for the new_state part is based on calculating its length depending on a len value read from the incoming message. This calculation may overflow leading to an incorrect bounds check. Subsequently, out-of-bounds reads may occur when decoding this part. This patch switches the multiplication to use check_mul_overflow() to abort processing the osdmap if an overflow occurred. Therefore, osdmaps/messages containing large values for len that result in a multiplication overflow are treated as invalid. [ idryomov: rename new_state_len -> new_state_item_size, formatting ]
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < 2ceee3b77b83052648c40fef965f836fd7699d26 (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < e4473751cc37db41f3f7da25d64a23e0c74570f1 (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < f6961070c326bd158c38fa48756cde2bd78c4aaa (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < 05c90e059269f087becfcce23348496085835c29 (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < 143ba49ead77ec483c0326f8aaad8649874e99c4 (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < 1732d89dfcd74f6fde9ce70900d316c4a151c153 (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < bee4b5b53e7bff0467fd916cc44c9b190733c6bd (git)
Affected: 930c532869774ebf8af9efe9484c597f896a7d46 , < 98917a499ec7064c14fc56d180a4fd636fc2784c (git)
Affected: 1196c36fd53c3b1615eb02f986cb727b1dfc1047 (git)
Affected: bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196 (git)
Affected: 6b96b2d473701b45df3fea8dd9796b6ec39e6d54 (git)
Affected: 7405d73cea0d0e6c541f5c534078feeb46188844 (git)
Affected: 8777c9f654637d56f4c4ca54eb1bc7c609b70085 (git)
Affected: 6831c98ce0b8a3e88db64aa224372effd0dcc694 (git)
Affected: 032951d32c13b7564dfba82758260cb7aa1149d2 (git)
Affected: 14877928f10667a5606383885d004f7185f33718 (git)
Affected: 3.10.103 , < 3.11 (semver)
Affected: 3.12.63 , < 3.13 (semver)
Affected: 3.14.75 , < 3.15 (semver)
Affected: 3.16.39 , < 3.17 (semver)
Affected: 3.18.39 , < 3.19 (semver)
Affected: 4.1.30 , < 4.2 (semver)
Affected: 4.4.17 , < 4.5 (semver)
Affected: 4.6.6 , < 4.7 (semver)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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 -\u003e new_state_item_size, formatting ]"
        }
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            "version": "3.1"
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              "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-\u003eosd_weight[], map-\u003eosd_state[], and map-\u003eosd_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."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:30.014Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c"
        }
      ],
      "title": "libceph: Fix multiplication overflow in decode_new_up_state_weight()",
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    "cveId": "CVE-2026-68158",
    "datePublished": "2026-08-10T11:59:24.675Z",
    "dateReserved": "2026-07-30T09:28:09.371Z",
    "dateUpdated": "2026-08-19T16:30:30.014Z",
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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 -\u003e new_state_item_size, formatting ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ceph/osdmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"2ceee3b77b83052648c40fef965f836fd7699d26\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"e4473751cc37db41f3f7da25d64a23e0c74570f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"f6961070c326bd158c38fa48756cde2bd78c4aaa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"05c90e059269f087becfcce23348496085835c29\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"143ba49ead77ec483c0326f8aaad8649874e99c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"1732d89dfcd74f6fde9ce70900d316c4a151c153\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"bee4b5b53e7bff0467fd916cc44c9b190733c6bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"930c532869774ebf8af9efe9484c597f896a7d46\",\"lessThan\":\"98917a499ec7064c14fc56d180a4fd636fc2784c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1196c36fd53c3b1615eb02f986cb727b1dfc1047\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6b96b2d473701b45df3fea8dd9796b6ec39e6d54\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7405d73cea0d0e6c541f5c534078feeb46188844\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8777c9f654637d56f4c4ca54eb1bc7c609b70085\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6831c98ce0b8a3e88db64aa224372effd0dcc694\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"032951d32c13b7564dfba82758260cb7aa1149d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14877928f10667a5606383885d004f7185f33718\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.10.103\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.12.63\",\"lessThan\":\"3.13\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.14.75\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.16.39\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.18.39\",\"lessThan\":\"3.19\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.1.30\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.4.17\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.6.6\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ceph/osdmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05c90e059269f087becfcce23348496085835c29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/143ba49ead77ec483c0326f8aaad8649874e99c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1732d89dfcd74f6fde9ce70900d316c4a151c153\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2ceee3b77b83052648c40fef965f836fd7699d26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bee4b5b53e7bff0467fd916cc44c9b190733c6bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4473751cc37db41f3f7da25d64a23e0c74570f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6961070c326bd158c38fa48756cde2bd78c4aaa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:18:00+00:00",
      "cve": "CVE-2026-68158",
      "id": "CVE-2026-68158",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: Fix multiplication overflow in decode_new_up_state_weight()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68158.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-18T00:08:26Z",
      "cve": "CVE-2026-68158",
      "id": "CVE-2026-68158",
      "initial_release_date": "2026-08-18T00:08:26Z",
      "product_status:known_affected": "292",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68158",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68158.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.