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TI-2026-79879 Aliases CVE-2026-99086GHSA-ppgf-6cf3-2qjr

Missing superblock validation in dm-integrity resume in Linux kernel

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
Partial Red Hat: 2 without a fix

No CVSS vector from any source. Fix status from CNA and Red Hat.

Summary

The dm-integrity device-mapper target in the Linux kernel does not validate the superblock it re-reads when a suspended device resumes. Affected are Linux kernel versions from 6.18.16 before 6.18.58, from 6.1.165 before 6.2, from 6.6.128 before 6.7, from 6.12.75 before 6.13, from 6.19.6 before 6.20, and from 7.0. A local user who can modify the underlying device while the target is suspended can change the journal geometry, which causes a write past the end of the journal and through a NULL page address.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: validate the superblock on resume dm_integrity_resume() re-reads the superblock from the device so that it picks up the flags and the recalculate position. It performs no validation on the result, while the constructor validates the superblock it reads and sizes all the in-memory structures according to it. The user may modify the superblock on the underlying device while the dm-integrity device is suspended, so that the two no longer agree. In particular, access_journal_data() shifts the journal entry index by ic->sb->log2_sectors_per_block, while ic->journal_section_sectors and the journal page list were computed with the value that was present at constructor time. Increasing log2_sectors_per_block makes the index run past the end of the journal, and dm-integrity then writes 512 bytes through lowmem_page_address(NULL). Snapshot the validated superblock in the constructor and refuse to resume if any of the fields that describe the on-disk geometry changed.

Why it matters now

EPSS 0.00162 5th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.18.58, 6.2, 6.7 +4Red Hat: 2 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.18.16 to before 6.18.58; 6.1.165 to before 6.2; 6.6.128 to before 6.7; 6.12.75 to before 6.13; 6.19.6 to before 6.206.18.58, 6.2, 6.7, 6.13, 6.20Patch availableCNA
LinuxLinux7.0 and later6.18.58, 7.2.12, 7.3Patch availableCNA
  • Linux VendorLinux Affected 6.18.16 to before 6.18.58; 6.1.165 to before 6.2; 6.6.128 to before 6.7; 6.12.75 to before 6.13; 6.19.6 to before 6.20 Fixed in 6.18.58, 6.2, 6.7, 6.13, 6.20 Patch available CNA
  • Linux VendorLinux Affected 7.0 and later Fixed in 6.18.58, 7.2.12, 7.3 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

The Linux kernel is fixed in 6.18.58, 6.2, 6.7, 6.13, 6.20, 7.2.12 and 7.3. The sources list no fixed version for Red Hat Enterprise Linux 10. The sources list no fixed version for Red Hat Enterprise Linux 9.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Linux (Linux) Fixed in 6.18.58, 6.2, 6.7, 6.13, 6.20
  • Fix · CNA Linux (Linux) Fixed in 6.18.58, 7.2.12, 7.3

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Not affected: 6 products
  • 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. 2026-10-23 Threatist record created from CVE-2026-99086
  2. 2026-10-23 Alias added: GHSA-ppgf-6cf3-2qjr
  3. 2026-10-27 Affected versions changed · Red Hat
  4. 2026-10-27 CVSS score added · Red Hat
  5. 2026-11-06 Affected versions changed · Red Hat

References

Other 3

  • 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 21727 →

Sources

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