Answer in brief
CVE-2026-45851 records a High severity (CVSS 7.1) vulnerability in efi: Fix reservation of unaccepted memory table. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8dbe33956d96c9d066ef15ca933ede30748198b2 <b7bc182ec1846be437351e44164089d988f9d0dd || >=8dbe33956d96c9d066ef15ca933ede30748198b2 <ba6b6f1502fa55621d1db23f253d54322bdbe4e0 || >=8dbe33956d96c9d066ef15ca933ede30748198b2 <9b18bf59977f5c5bc3b11b210520f62500a7adf3 || >=8dbe33956d96c9d066ef15ca933ede30748198b2 <e649b5916725c68f44ebf45fb396df563c5dbaf2 || >=8dbe33956d96c9d066ef15ca933ede30748198b2 <0862438c90487e79822d5647f854977d50381505 | b7bc182ec1846be437351e44164089d988f9d0dd, ba6b6f1502fa55621d1db23f253d54322bdbe4e0, 9b18bf59977f5c5bc3b11b210520f62500a7adf3, e649b5916725c68f44ebf45fb396df563c5dbaf2, 0862438c90487e79822d5647f854977d50381505 |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.