CVE-2026-53615

LOWCVSS 8.0 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

util-linux is a random collection of Linux utilities. Before util-linux 2.41.4, `parse_dos_extended()` in `libblkid/src/partitions/dos.c` computes an extended-partition start sector with 32-bit addition and does not apply the extended-area bounds checks to the first two EBR entries. A local attacker who causes a crafted DOS extended-partition disk image or removable medium to be probed can wrap `cur_start + start` to sector zero and cause libblkid to report a false partition overlapping the MBR. This directly compromises the integrity of the reported partition metadata; disk modification or availability loss requires a separate downstream consumer to act on that metadata. This issue is fixed in 2.41.4.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-190

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Full discourse1 post

Upwind Security MDR@UpwindMDR1d
🚨HIGH - util-linux libblkid DOS Extended Partition Integer Wrap (CVE-2026-53615) In util-linux < 2.41.4, libblkid parse_dos_extended() uses 32-bit addition for extended-partition start sector and skips extended-area bounds checks for the first two EBR entries. Probing a crafted DOS extended-partition disk image/removable medium can wrap to sector 0, making libblkid report partition metadata overlapping the MBR; impact depends on downstream consumers. 👉Affected: util-linux < 2.41.4 | Upgrade to 2.41.4
0000041
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