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CVE-2026-97993· NVD / CVE Program· CNA Linux

vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 388c678639a0cebfd936b3e56c64ac6a371efec2, 4fde085eb839fbb39c25cbba5d2a091ded394877, 59fc7c1c6b4d325194ca45352180340092d95098; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 388c678639a0cebfd936b3e56c64ac6a371efec2, 4fde085eb839fbb39c25cbba5d2a091ded394877, 59fc7c1c6b4d325194ca45352180340092d95098; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx vhost_vdpa_set_config_call() swaps the eventfd_ctx_fdget() return value into v->config_ctx before checking it, so on failure the field briefly holds an ERR_PTR: ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); swap(ctx, v->config_ctx); if (!IS_ERR_OR_NULL(ctx)) eventfd_ctx_put(ctx); if (IS_ERR(v->config_ctx)) { long ret = PTR_ERR(v->config_ctx); v->config_ctx = NULL; return ret; } Commit 0bde59c1723a ("vhost-vdpa: set v->config_ctx to NULL if eventfd_ctx_fdget() fails") added that clearing, and spelled out the invariant the rest of the file relies on: "we consider 'v->config_ctx' valid if it is not NULL". The window between the swap and the clearing still breaks it. vhost_vdpa_config_cb() only tests for NULL, so a config interrupt delivered inside the window hands the ERR_PTR to eventfd_signal(). Check the fd before installing it instead. That closes the window and matches how vhost_vring_ioctl() handles the same failure for the vq call fd. It also stops a rejected fd from tearing down a config interrupt that was working: until now the swap replaced the live context and put it, so after an EBADF the device silently stopped delivering config interrupts until userspace installed a new fd.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 3, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.8affected
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before e260dc9fbfdae0978e7a8698f977fbb463a657beaffected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 66e73fa18910b39fea0941dea5fe091122240855affected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 4fde085eb839fbb39c25cbba5d2a091ded394877affected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 59fc7c1c6b4d325194ca45352180340092d95098affected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 388c678639a0cebfd936b3e56c64ac6a371efec2affected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 65faf9eaa00e408e1406fbcf675c8c8d0e27ff2aaffected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before 6b20b40f020bde236f6b8a08ff88d8653261ec2baffected · git
    • 776f395004d829bbbf18c159ed9beb517a208c71 and later · before e74a9fa50749b9940b4fb13199652325e08d3c4aaffected · git
    • before 5.8not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-97990Sep 25, 2026 · vdpa_sim_net: check TX pull result before RX copy
    30Monitor
  • ← EarlierCVE-2026-97991Sep 25, 2026 · vdpa_sim_blk: reject out-of-range sector starts
    31Monitor
  • Later →CVE-2026-97994Sep 25, 2026 · vhost/vdpa: reject VRING_NUM larger than device max
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux388c678639a0cebfd936b3e56c64ac6a371efec2Vendor (CNA)
Linux Linux4fde085eb839fbb39c25cbba5d2a091ded394877Vendor (CNA)
Linux Linux59fc7c1c6b4d325194ca45352180340092d95098Vendor (CNA)
Linux Linux65faf9eaa00e408e1406fbcf675c8c8d0e27ff2aVendor (CNA)
Linux Linux66e73fa18910b39fea0941dea5fe091122240855Vendor (CNA)
Linux Linux6b20b40f020bde236f6b8a08ff88d8653261ec2bVendor (CNA)
Linux Linuxe260dc9fbfdae0978e7a8698f977fbb463a657beVendor (CNA)
Linux Linuxe74a9fa50749b9940b4fb13199652325e08d3c4aVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records