CVE-2026-80853

UNRATEDCVSS · not yet scored

Also known asEUVD-2026-71303 (ENISA EUVD) · GHSA-g73p-24rg-vmh3 (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (kernel.org) lists Linux versions before 7.2 and 7.3 and later as unaffected. No release containing a fix is confirmed on record.

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

KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts

When {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled host via a temporary buffer, allocate a full 4KiB page for the buffer to ensure the page containing the buffer is wholly owned by KVM, i.e. won't be concurrently allocated and accessed by other kernel code while KVM is using the buffer to {de,en}crypt memory. On SNP-enabled platforms, when sending SEV/SEV-ES commands that trigger firmware writes to memory, the to-be-written page(s) must be (temporarily) assigned to Firmware (as required by the SNP architecture, to guard against using such commands as gadgets to attack SNP guests). See snp_map_cmd_buf_desc() and friends.

Unfortunately, transferring ownership of a page to Firmware makes the page inaccessible to software, and thus writes generate RMP #PF violations. If KVM uses a sub-page allocation for its temporary buffer, some other actor in the kernel can allocate and use the other portions of the page, and thus trigger unexpected (and seemingly spurious) RMP #PF violations due to software attempting to access a Firmware-owned page.

BUG: unable to handle page fault for address: ffff906ae30f0300 #PF: supervisor write access in kernel mode #PF: error_code(0x80000003) - RMP violation PGD 6b1b80d067 P4D 6b1b80d067 PUD 100231e2063 PMD 10055a88063 PTE 80000100630f0163 SEV-SNP: PFN 0x100630f0 unassigned, dumping non-zero entries in 2M PFN region: [0x10063000 - 0x10063200] Oops: Oops: 0003 [#1] SMP CPU: 70 UID: 0 PID: 10658 Comm: svw_WaiterThrea Tainted: G U W O 7.1.0-smp--c22293789940-seanjc-next #1 PREEMPTLAZY Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 34.86.0-102 01/25/2026 RIP: 0010:memset+0xf/0x20 Call Trace: __kvmalloc_node_noprof+0x2a4/0x710 do_getxattr+0x4e/0x130 path_getxattrat+0x125/0x1b0 do_syscall_64+0x10a/0x480 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f3a22cb6daa Modules linked in: kvm_amd kvm irqbypass vfat fat ccp k10temp sha3 libsha3 i2c_piix4 gq(O) cdc_acm xhci_pci xhci_hcd gsmi: Log Shutdown Reason 0x03 CR2: ffff906ae30f0300 ---[ end trace 0000000000000000 ]--- RIP: 0010:memset+0xf/0x20 Kernel panic - not syncing: Fatal exception Kernel Offset: 0x39e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) gsmi: Log Shutdown Reason 0x02

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 4, 2026

Last Modified

October 19, 2026

References (2)

Vendor Advisories for CVE-2026-80853(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 8× in last 7d / 44× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 71 is merged into the row it repeats.

  1. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-25 13:59 UTCEG score recompute
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  7. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  8. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-19 09:25 UTCNVD update
  11. 2026-10-19 09:23 UTCEG score recompute
  12. 2026-10-19 09:23 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  13. 2026-10-19 08:58 UTCMITRE cvelistV5
  14. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-10-18 03:09 UTCEG score recompute
  16. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-10-12 14:57 UTCEG score recompute
  23. 2026-10-11 19:21 UTCEG score recompute
  24. 2026-10-11 16:37 UTCEG score recompute
  25. 2026-10-11 13:55 UTCEG score recompute
Show 45 more
  1. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-09 01:11 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  5. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  7. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  8. 2026-10-06 00:58 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-10-03 04:45 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  13. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  16. 2026-09-30 08:32 UTCEG score recompute
  17. 2026-09-30 08:32 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  18. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-09-27 12:19 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-09-24 16:06 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  26. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  27. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  28. 2026-09-21 19:53 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  29. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  30. 2026-09-18 23:40 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  31. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  34. 2026-09-16 03:27 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  35. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  36. 2026-09-13 07:13 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  37. 2026-09-10 11:01 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  38. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  39. 2026-09-07 14:38 UTCEG score recompute
  40. 2026-09-07 14:37 UTCGHSA enrichmentGHSA-g73p-24rg-vmh3
  41. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  42. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  43. 2026-09-04 16:22 UTCNVD update
  44. 2026-09-04 16:05 UTCEG score recompute
  45. 2026-09-04 16:04 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-80853?
CVE-2026-80853 is a vulnerability whose severity is not yet rated; its CVE record was published on September 4, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts When {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled host via a temporary buffer, allocate a full 4KiB page for the buffer to ensure the…
When was the CVE record for CVE-2026-80853 published?
The CVE record for CVE-2026-80853 was published on September 4, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-80853 actively exploited?
CVE-2026-80853 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-80853?
No fix for CVE-2026-80853 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (kernel.org) lists Linux versions before 7.2 and 7.3 and later as unaffected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-80853 are linked in the Vendor Advisories panel on this page.

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