# CVE-2026-45851: efi: Fix reservation of unaccepted memory table

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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

efi: Fix reservation of unaccepted memory table

The reserve_unaccepted() function incorrectly calculates the size of the
memblock reservation for the unaccepted memory table. It aligns the
size of the table, but fails to account for cases where the table's
starting physical address (efi.unaccepted) is not page-aligned.

If the table starts at an offset within a page and its end crosses into
a subsequent page that the aligned size does not cover, the end of the
table will not be reserved. This can lead to the table being overwritten
or inaccessible, causing a kernel panic in accept_memory().

This issue was observed when starting Intel TDX VMs with specific memory
sizes (e.g., > 64GB).

Fix this by calculating the end address first (including the unaligned
start) and then aligning it up, ensuring the entire range is covered
by the reservation.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 8dbe33956d96c9d066ef15ca933ede30748198b2; < b7bc182ec1846be437351e44164089d988f9d0dd (affected, git); ≥ 8dbe33956d96c9d066ef15ca933ede30748198b2; < ba6b6f1502fa55621d1db23f253d54322bdbe4e0 (affected, git); ≥ 8dbe33956d96c9d066ef15ca933ede30748198b2; < 9b18bf59977f5c5bc3b11b210520f62500a7adf3 (affected, git); ≥ 8dbe33956d96c9d066ef15ca933ede30748198b2; < e649b5916725c68f44ebf45fb396df563c5dbaf2 (affected, git); ≥ 8dbe33956d96c9d066ef15ca933ede30748198b2; < 0862438c90487e79822d5647f854977d50381505 (affected, git). Source: CNA: Linux
- Linux / Linux: 6.6 (affected); ≥ 0; < 6.6 (unaffected, semver); ≥ 6.6.128; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.65%

- 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/b7bc182ec1846be437351e44164089d988f9d0dd (CNA: Linux)

- https://git.kernel.org/stable/c/ba6b6f1502fa55621d1db23f253d54322bdbe4e0 (CNA: Linux)

- https://git.kernel.org/stable/c/9b18bf59977f5c5bc3b11b210520f62500a7adf3 (CNA: Linux)

- https://git.kernel.org/stable/c/e649b5916725c68f44ebf45fb396df563c5dbaf2 (CNA: Linux)

- https://git.kernel.org/stable/c/0862438c90487e79822d5647f854977d50381505 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45851; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45851; retrieved 2026-11-06; source updated Not reported

Revision: 3121f21a21e11ef0958402463b174060142ca942638fe83b2a0b1404b224c431

Canonical: https://y2.dev/cve/CVE-2026-45851

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