CVE-2026-72018 (GCVE-0-2026-72018)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-10-16 18:42
VLAI
EPSS
VEX
Title
dibs: loopback: validate offset and size in move_data()
Summary
In the Linux kernel, the following vulnerability has been resolved:
dibs: loopback: validate offset and size in move_data()
The loopback move_data() performs a memcpy into the registered DMB
without checking whether offset + size exceeds the DMB length. Unlike
real ISM hardware, which enforces memory region bounds natively, the
software loopback has no such protection.
A peer-supplied out-of-bounds offset or oversized write would result in
an OOB write past the allocated kernel buffer. Add an explicit bounds
check before the memcpy to reject such requests with -EINVAL.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:42 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f7a22071dbf316c982fb44308874bd7ad9ac2091 , < ee188a6b264b71315a67f1b9470faad308b730d2
(git)
Affected: f7a22071dbf316c982fb44308874bd7ad9ac2091 , < b2f426a9a22886071966432ede8fceafffe12b8c (git) Affected: f7a22071dbf316c982fb44308874bd7ad9ac2091 , < 94fe0ab01b480b52bd8f977edbd845ef375d69fd (git) Affected: f7a22071dbf316c982fb44308874bd7ad9ac2091 , < 78237e3c0720fcc6eb9b87e90fd70f63eeca886f (git) |
guessed | |
| Linux | Linux |
Affected:
6.10
Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:L - The flaw is only reachable via loopback-ISM (intra-OS DIBS), which requires matching local GID and shared kernel; exploitation is through AF_SMC sendmsg after SMC-D handshake, not remote packet handling on a network-facing stack path.\nAC:L - A malicious SMC-D peer can supply crafted CLC dmbe_idx/dmbe_size values and send patterns that drive move_data() with attacker-controlled offset and size; no race or uncontrollable memory layout is required once loopback-ISM is active.\nPR:L - Exploitation requires only an unprivileged local account able to open AF_SMC sockets and complete an SMC-D loopback handshake (no CAP_NET_ADMIN or root); the SMC CLC path performs no authentication beyond standard socket access controls.\nUI:N - No victim user action is needed when a malicious peer initiates an inbound SMC-D connection to a listening service; the attacker can trigger the OOB write by sending SMC-D data after handshake completion.\nS:U - The OOB write corrupts kernel heap memory within the same kernel security authority; successful exploitation yields local privilege escalation, not cross-VM, container-boundary, or IOMMU bypass scope change.\nC:H - An out-of-bounds kernel heap write past the folio-allocated DMB buffer can corrupt adjacent kernel objects and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak or pure crash.\nI:H - The unchecked memcpy() allows controlled out-of-bounds writes beyond the registered DMB allocation, enabling heap corruption and potential arbitrary kernel code execution or control-flow hijacking.\nA:H - Writing past the allocated DMB folio can immediately corrupt critical kernel structures and cause kernel oops, panic, or hang; heap corruption from the OOB write itself constitutes high availability impact."
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"title": "kernel: dibs: loopback: validate offset and size in move_data()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72018.json",
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}
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| Author | Source | Type | Date | Other |
|---|
Nomenclature
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