VulnerabilityPublished 6 Nov 2026

CVE-2026-100082: Linux kernel · xen-blkback: Avoid UAF when reading I/O statistics

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b : patch Linux kernel soon.

Data as of 6 Nov 2026, 19:19 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b, c49934da934cf495faf782aa5d84f413221c9be6, b0378161c28e77e4d0e2eda3c9433ab4394d2a2f +11

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected <5.10.274 <5.15.225 <6.1.192 <6.6.162 <6.12.116 <6.18.62 <7.3.3	Fixed in fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b c49934da934cf495faf782aa5d84f413221c9be6 b0378161c28e77e4d0e2eda3c9433ab4394d2a2f b764e17313534794aeb99c901869f213e36a16ef 253cff0526781e28b1b0f9fdacd74ecdc23d3ab7 58ba056991dbcec8a75e6861cb4479ac947b69e6 7.3.3 6.18.62 6.12.116 6.6.162 6.1.192 5.15.225 5.10.274 2c9ccbe0ffcff3615c7ad917c49b67571a41f21c
Linuxlinux/kernel`pkg:deb/linux/kernel`Other threats	Affected <5.10.274 <5.15.225 <6.1.192 <6.6.162 <6.12.116 <6.18.62 <7.3.3	Fixed in 5.10.274 5.15.225 6.1.192 6.6.162 6.12.116 6.18.62 7.3.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in Linux kernel versions 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, and 7.3.3. Users and administrators should upgrade to these or later kernel versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

In the Linux kernel, the following vulnerability has been resolved: xen-blkback: Avoid UAF when reading I/O statistics Reading I/O statistics via sysfs concurrently with tearing down a frontend device might result in UAF or a NULL dereference, as the reading of the statistics data is not synchronized with freeing the data. Use a rwlock for synchronizing. This is XSA-528 / CVE-2026-100082

Impact

Exploitation of this vulnerability could lead to kernel crashes or potential memory corruption due to use-after-free or NULL dereference conditions when accessing I/O statistics. This could affect system stability and potentially allow escalation of privileges or denial of service if exploited. However, no known exploits in the wild have been reported.

Summary

The Linux kernel xen-blkback driver had a vulnerability where reading I/O statistics through sysfs concurrently with device teardown could cause a use-after-free or NULL pointer dereference. This was due to unsynchronized access to the statistics data structure. The fix involved adding a read-write lock to ensure proper synchronization and prevent the use-after-free condition. This vulnerability is tracked as XSA-528 and CVE-2026-100082 and affects multiple Linux kernel versions prior to the fixed commits and releases.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 18:35 UTC

Technical details

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