- Exploited
- No known exploitation
- Fix
- Fixed in 6.12.117, 6.18.63, 7.3.4
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 6.12.117, 6.18.63, 7.3.4.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 20/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved:
xen-netback: Fix XenBus connection failure cleanup
xenvif_get_stats and xenvif_get_ethtool_stats capture vif->num_queues under rcu_read_lock. We need to unpublish vif->num_queues before synchronize_net to ensure that readers that come afterwards will not read a non-zero vif->num_queues and attempt to access invalid queues.
Show the full description
This is the same cleanup algorithm as used in backend_disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect").
This is XSA-531
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach20/20Affects Linux kernel (software on nearly every server, desktop or phone)
- Severity?/10Unknown. No CVSS score or vendor rating
- No patch0/5No signal
What would change the score
- Would score about 75 if added to CISA KEV
- Would score about 70 if CISA's SSVC rates exploitation active
- Would score about 42 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 6.12.117, 6.18.63, 7.3.4.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-99286 (xen-netback: Fix XenBus connection failure cleanup), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-99286 (entry last updated 2026-11-10): Affected: - Linux Linux: fixed in 6.12.117; fixed in 6.18.63; fixed in 7.3.4 - Linux Linux: version range not reported Fixed versions: 6.12.117, 6.18.63, 7.3.4. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-99286 is not listed as of cve.now's last read. This KEV status is for CVE-2026-99286 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://git.kernel.org/stable/c/ade3082dcdee17c5767069883936d64ff83f6c9f - https://git.kernel.org/stable/c/a97aa838903d15f865d80809f5198ff459c6634a - https://git.kernel.org/stable/c/07aca7d25ce8578fedde49855983a01c537a782b - http://www.openwall.com/lists/oss-security/2026/11/10/25 - http://xenbits.xen.org/xsa/advisory-531.html Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-99286 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-99286.
Timeline
- CVE published
- First seen by cve.now
- Record last updated
Affected versions
- Linux Linux
fixed in 6.12.117; fixed in 6.18.63; fixed in 7.3.4
- Linux Linux
Version range not reported
Evidence 7
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Write-ups · 1
Establishes: Technical detail and context.
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-99286
Is CVE-2026-99286 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-99286?
Linux: before 6.12.117; before 6.18.63; before 7.3.4.Source: cve.now feed data
How do I fix CVE-2026-99286?
Upgrade to a fixed version: 6.12.117, 6.18.63, 7.3.4.Source: cve.now feed data