efi: Fix reservation of unaccepted memory table (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.16 % · percentile 6 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-125 — Out-of-bounds Read
References
- https://git.kernel.org/stable/c/b7bc182ec1846be437351e44164089d988f9d0dd
- https://git.kernel.org/stable/c/ba6b6f1502fa55621d1db23f253d54322bdbe4e0
- https://git.kernel.org/stable/c/9b18bf59977f5c5bc3b11b210520f62500a7adf3
- https://git.kernel.org/stable/c/e649b5916725c68f44ebf45fb396df563c5dbaf2
- https://git.kernel.org/stable/c/0862438c90487e79822d5647f854977d50381505
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-32317
- GCVE · GCVE-0-2026-45851
CERT-FR advisories
- CERTFR-2026-AVI-1064 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0861 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0831 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.6.1 < 6.6.128cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.75cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 6.19.4cpe:2.3:o:linux:linux_kernel:6.6:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.6:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.6:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.6:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.6:rc7:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 8dbe33956d96c9d066ef15ca933ede30748198b2 < b7bc182ec1846be437351e44164089d988f9d0dd ; affected 8dbe33956d96c9d066ef15ca933ede30748198b2 < ba6b6f1502fa55621d1db23f253d54322bdbe4e0 ; affected 8dbe33956d96c9d066ef15ca933ede30748198b2 < 9b18bf59977f5c5bc3b11b210520f62500a7adf3 ; affected 8dbe33956d96c9d066ef15ca933ede30748198b2 < e649b5916725c68f44ebf45fb396df563c5dbaf2 ; affected 8dbe33956d96c9d066ef15ca933ede30748198b2 < 0862438c90487e79822d5647f854977d50381505 |
| Linux · Linux | affected 6.6 ; unaffected 0 < 6.6 ; unaffected 6.6.128 ≤ 6.6.* ; unaffected 6.12.75 ≤ 6.12.* ; unaffected 6.18.14 ≤ 6.18.* ; unaffected 6.19.4 ≤ 6.19.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |