EUVD-2026-76282
GHSA-9gr7-7h3r-cj7p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CAP_SYS_ADMIN is explicitly required to supply the device, mapping to PR:H; all other metrics align with the description.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
dm-pcache: bound the persisted tail-position offset
cache_pos_decode() takes the persisted key_tail and dirty_tail seg_off from the cache device and addresses within the segment with it. A seg_off at or past the segment data_size, controllable by whoever supplies the device (CAP_SYS_ADMIN), reads past the segment data.
Reject a decoded seg_off that is not below the segment data_size.
AnalysisAI
Out-of-bounds memory access in the Linux kernel's dm-pcache (device-mapper persistent cache) subsystem allows a local privileged attacker to read past segment data boundaries. The cache_pos_decode() function loads key_tail and dirty_tail segment offsets (seg_off) directly from the cache device without validating them against the segment's data_size, so a crafted cache device with an oversized seg_off causes the kernel to address memory beyond the segment buffer. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires CAP_SYS_ADMIN on the target system in order to create and supply a crafted block device through the device-mapper interface - this is not a default unprivileged-user vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), but the PR:L metric appears understated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released kernel patches: update to Linux 6.18.50, 7.2.4, or 7.3-rc1 or later, which contain the fix that rejects any `seg_off >= segment.data_size` in `cache_pos_decode()`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify Linux systems where device-mapper persistent cache is enabled and document their current kernel versions. …
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External POC / Exploit Code
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