# CVE-2026-72030: ata: libata-core: Reject an invalid concurrent positioning ranges count

Status: published. Published: 2026-08-15. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

ata: libata-core: Reject an invalid concurrent positioning ranges count

ata_dev_config_cpr() takes the number of range descriptors from buf[0]
of the concurrent positioning ranges log (up to 255), which the device
reports independently of the log size in the GPL directory. The count is
then walked at a fixed 32-byte stride in two places with no bound: the
log read here, and the INQUIRY VPD page B9h emitter, which writes one
descriptor per range into the fixed 2048-byte ata_scsi_rbuf. A device
reporting a count larger than its own log overflows the read buffer (up
to 7704 bytes past a 512-byte slab), and a count above 62 overflows the
response buffer on the emit side.

Bound the count once, on probe, against both the log the device returned
and the number of descriptors the VPD B9h response buffer can hold
(ATA_DEV_MAX_CPR, derived from the rbuf size). Reject an out-of-range
count with a warning; this keeps the emitter in bounds with no separate
change there.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < 01d7d321e6046f87ba270aeeffdc5260209bd91e (affected, git); ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < 4cb4b4dd8853c4ab3057efe238b2c34277772176 (affected, git); ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < b1607f0ee5f5e53e0aa66f41794085b7cc98f5d1 (affected, git); ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < 4c1e8ccd8655ee8cf1bcb1b7dfee72c9fa941fd4 (affected, git); ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < d43efd1b5d976203e6f1ef26f67e8b1a7bc2751b (affected, git); ≥ fe22e1c2f705676a705d821301fc52eecc2fe055; < 533a0b940f901c15e5cbbd4b5d66e871c209e8ce (affected, git). Source: CNA: Linux
- Linux / Linux: 5.16 (affected); ≥ 0; < 5.16 (unaffected, semver); ≥ 6.1.184; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.5; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-06; percentile 10.67%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/01d7d321e6046f87ba270aeeffdc5260209bd91e (CNA: Linux)

- https://git.kernel.org/stable/c/4cb4b4dd8853c4ab3057efe238b2c34277772176 (CNA: Linux)

- https://git.kernel.org/stable/c/b1607f0ee5f5e53e0aa66f41794085b7cc98f5d1 (CNA: Linux)

- https://git.kernel.org/stable/c/4c1e8ccd8655ee8cf1bcb1b7dfee72c9fa941fd4 (CNA: Linux)

- https://git.kernel.org/stable/c/d43efd1b5d976203e6f1ef26f67e8b1a7bc2751b (CNA: Linux)

- https://git.kernel.org/stable/c/533a0b940f901c15e5cbbd4b5d66e871c209e8ce (CNA: Linux)

- https://git.kernel.org/stable/c/01d7d321e6046f87ba270aeeffdc5260209bd91e (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/4c1e8ccd8655ee8cf1bcb1b7dfee72c9fa941fd4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/4cb4b4dd8853c4ab3057efe238b2c34277772176 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/533a0b940f901c15e5cbbd4b5d66e871c209e8ce (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b1607f0ee5f5e53e0aa66f41794085b7cc98f5d1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/d43efd1b5d976203e6f1ef26f67e8b1a7bc2751b (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-72030; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72030; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-72030; retrieved 2026-11-06; source updated Not reported

Revision: 60c14db8ed69210a87f79a88f622db6398cf12b0015137ee50f58876102e8a03

Canonical: https://y2.dev/cve/CVE-2026-72030

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