{"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"}}}}