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NVD / CVE Program· CNA Linux

CVE-2026-23032: null_blk: fix kmemleak by releasing references to fault configfs items

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: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2, 40b94ec7edbbb867c4e26a1a43d2b898f04b93c5, d59ba448ccd595d5d65e197216cf781a87db2b28.

Low priority for now. Upgrade to Linux Linux 1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2, 40b94ec7edbbb867c4e26a1a43d2b898f04b93c5, d59ba448ccd595d5d65e197216cf781a87db2b28 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: null_blk: fix kmemleak by releasing references to fault configfs items When CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION is enabled, the null-blk driver sets up fault injection support by creating the timeout_inject, requeue_inject, and init_hctx_fault_inject configfs items as children of the top-level nullbX configfs group. However, when the nullbX device is removed, the references taken to these fault-config configfs items are not released. As a result, kmemleak reports a memory leak, for example: unreferenced object 0xc00000021ff25c40 (size 32): comm "mkdir", pid 10665, jiffies 4322121578 hex dump (first 32 bytes): 69 6e 69 74 5f 68 63 74 78 5f 66 61 75 6c 74 5f init_hctx_fault_ 69 6e 6a 65 63 74 00 88 00 00 00 00 00 00 00 00 inject.......... backtrace (crc 1a018c86): __kmalloc_node_track_caller_noprof+0x494/0xbd8 kvasprintf+0x74/0xf4 config_item_set_name+0xf0/0x104 config_group_init_type_name+0x48/0xfc fault_config_init+0x48/0xf0 0xc0080000180559e4 configfs_mkdir+0x304/0x814 vfs_mkdir+0x49c/0x604 do_mkdirat+0x314/0x3d0 sys_mkdir+0xa0/0xd8 system_call_exception+0x1b0/0x4f0 system_call_vectored_common+0x15c/0x2ec Fix this by explicitly releasing the references to the fault-config configfs items when dropping the reference to the top-level nullbX configfs group.

—No exploit Fix available
Published
Jan 31, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 13th 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

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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.

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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

    • 6.4affected
    • bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea and later · before 1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2affected · git
    • bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea and later · before d59ba448ccd595d5d65e197216cf781a87db2b28affected · git
    • bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea and later · before f1718da051282698aa8fa150bebb9724f6389fdaaffected · git
    • bb4c19e030f45c5416f1eb4daa94fbaf7165e9ea and later · before 40b94ec7edbbb867c4e26a1a43d2b898f04b93c5affected · git
    • before 6.4not affected · semver
    • 6.6.122 and later · up to and including 6.6.*not affected · semver
    • 6.12.67 and later · up to and including 6.12.*not affected · semver
    • 6.18.7 and later · up to and including 6.18.*not affected · semver
    • 6.19 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.8-16.18.8-1

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-2026-23030Jan 31, 2026 · phy: rockchip: inno-usb2: Fix a double free bug in rockchip_usb2phy_probe()
    0Monitor
  • ← EarlierCVE-2026-23031Jan 31, 2026 · can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak
    0Monitor
  • Later →CVE-2026-23033Jan 31, 2026 · dmaengine: omap-dma: fix dma_pool resource leak in error paths
    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 Linux1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2Vendor (CNA)
Linux Linux40b94ec7edbbb867c4e26a1a43d2b898f04b93c5Vendor (CNA)
Linux Linuxd59ba448ccd595d5d65e197216cf781a87db2b28Vendor (CNA)
Linux Linuxf1718da051282698aa8fa150bebb9724f6389fdaVendor (CNA)
debian:linux6.12.69-1 · Debian:13Package 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.

No history yet (it accumulates with the daily EPSS job).

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

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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.

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Bug bounty scope

No known public program.

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

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✗ → ✓

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References

Show all references (4 more)

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

All records