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TI-2026-86063 Aliases CVE-2026-100082GHSA-66hr-m8f4-fvw9

Use-after-free in Linux kernel xen-blkback I/O statistics reads

Priority LOW 22Published · Updated

Key facts

Attack vector
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Privileges required
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User interaction
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Attack complexity
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Impact type
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Confidentiality · integrity · availability
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Fix status
Fixed

No CVSS vector from any source. Fix status from CNA.

Summary

The Linux kernel xen-blkback driver is affected in versions before 5.10.274, before 5.15.225, before 6.1.192, before 6.6.162, before 6.12.116, before 6.18.62 and before 7.3.3. Reading I/O statistics through sysfs while a frontend device is being torn down can cause a use-after-free or NULL pointer dereference, because reads of the statistics data are not synchronized with freeing that data. The flaw is fixed by synchronizing these accesses with a read-write lock.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

Description from the CNA

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

Why it matters now

EPSS 0.00244 15th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 5.10.274, 5.15.225, 6.1.192 +4

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinuxbefore 5.10.274; before 5.15.225; before 6.1.192; before 6.6.162; before 6.12.116; before 6.18.62; before 7.3.35.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3Patch availableCNA
LinuxLinux—5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3Patch availableCNA
  • Linux VendorLinux Affected before 5.10.274; before 5.15.225; before 6.1.192; before 6.6.162; before 6.12.116; before 6.18.62; before 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 Patch available CNA
  • Linux VendorLinux Affected — Fixed in 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

Upgrade the Linux kernel to 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62 or 7.3.3, depending on the branch in use.

Written with Claude Haiku 5.5 from the sources below · 2026-11-08

  • Fix · CNA Linux (Linux) Fixed in 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3
  • Fix · CNA Linux (Linux) Fixed in 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 7 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-100082
  2. 2026-11-06 Alias added: GHSA-66hr-m8f4-fvw9
  3. 2026-11-08 Affected versions changed · Red Hat
  4. 2026-11-08 CVSS score added · Red Hat

References

Other 7

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences