EUVD-2026-62728
GHSA-v3g4-vgfp-mmr7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Remote unauthenticated packet parsing (AV:N/AC:L/PR:N/UI:N); out-of-bounds read leaks sensitive memory (C:H) and can crash the parser (A:H), but a read does not alter data (I:N).
Primary rating from Vendor (ibm).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to obtain sensitive information due to an integer underflow in the IPv4 IP-options parser.
AnalysisAI
Remote information disclosure in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 stems from an integer underflow in the kernel's IPv4 IP-options parser (CWE-125 out-of-bounds read), letting a remote attacker leak sensitive memory contents by sending crafted IP packets. IBM (the reporting vendor) rates it CVSS 9.4, and a patch is available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to deliver crafted IPv4 packets bearing IP options to the target's network stack - the specific trigger is malformed IP-options fields that drive an integer underflow in the parser. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) describes an unauthenticated, low-complexity, remote attack with no user interaction, which is genuinely dangerous for an internet- or LAN-reachable host. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to an AIX or VIOS host crafts IPv4 packets containing malformed IP options that trigger the integer underflow in the options parser, causing the stack to read beyond the buffer and return adjacent kernel memory. Repeating this, the attacker harvests fragments of sensitive in-memory data. … |
| Remediation | Patch available per vendor advisory: apply the IBM-provided fix documented at https://www.ibm.com/support/pages/node/7283858 for AIX 7.2, AIX 7.3, and PowerVM VIOS 4.1 (consult that page for the exact APAR/iFix or ioslevel to install, as no specific fix version was included in the source data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all systems running IBM AIX 7.2, 7.3, or PowerVM VIOS 4.1, noting their network exposure and criticality to operations. …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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