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CVE-2026-93048· NVD / CVE Program· CNA Linux

mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 181c1bff940e7d3e34ca485d37e3cdbfe409203c, 398aca2f90122d5abbabff1079deaeb885fe9e40, 6aaab2ace3f7b55733d904e5549acf8405f03642; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 181c1bff940e7d3e34ca485d37e3cdbfe409203c, 398aca2f90122d5abbabff1079deaeb885fe9e40, 6aaab2ace3f7b55733d904e5549acf8405f03642; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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

In the Linux kernel, the following vulnerability has been resolved: mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition() mtd_add_partition() does not reject the special offset value MTDPART_OFS_RETAIN (-3), which leads to a WARN_ON in add_mtd_device() when called through the BLKPG ioctl on NAND devices. The RETAIN value depends on cur_offset being the end of the previous partition, but in the dynamic partition path cur_offset equals the offset argument itself, causing undefined behavior. Commit 5daa7b21496a ("mtd: prepare partition add and del functions for ioctl requests") introduced mtd_add_partition() and correctly rejected MTDPART_OFS_APPEND (-1) and MTDPART_OFS_NXTBLK (-2), since those special offsets rely on cur_offset tracking the previous partition's end. However, commit 1a31368bf92e ("mtd: add a flags for partitions which should just leave smth. after them") later added MTDPART_OFS_RETAIN (-3) for the static partition table path without updating mtd_add_partition() to also reject this value. With offset=-3 passed via BLKPG, the RETAIN size calculation in allocate_partition() underflows (parent_size - 0xFFFFFFFFFFFFFFFD = parent_size + 3). If the underflow result does not appear to leave enough space, allocate_partition() jumps to out_register via goto, skipping erasesize initialization. This results in erasesize=0, which triggers: WARN_ON((!mtd->erasesize || !master->_erase) && !(mtd->flags & MTD_NO_ERASE)) in add_mtd_device(). If the underflow result appears to leave enough space, a bogus partition size is calculated, but the "out of reach" sanity check catches the invalid offset and creates a disabled empty partition (offset=0, size=0) instead of returning an error. Fix this by adding MTDPART_OFS_RETAIN to the rejection list in mtd_add_partition(), consistent with the existing handling of APPEND and NXTBLK.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Sep 17, 2026
EPSS
0.2% · 11th 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

What does it mean in your environment?

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Affected systems

Is your version affected?

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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

    • 3.2affected
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before 701c3ae7273e1adc20db5d97c42e0139b479f16baffected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before 6aaab2ace3f7b55733d904e5549acf8405f03642affected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before 181c1bff940e7d3e34ca485d37e3cdbfe409203caffected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before a536eb57be58442b19398b2783071007ecfb1735affected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before e204e5c49a012f99638633fdbd773e3c86260053affected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before 398aca2f90122d5abbabff1079deaeb885fe9e40affected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before c645f6dd1af2ecc70fd3578e141f2f71fa9e4effaffected · git
    • 1a31368bf92ef2a7da3ba379672c405bd2751df9 and later · before b759d5bb6265419344ee9729fd0dc07ad85719d8affected · git
    • before 3.2not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

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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 Linux181c1bff940e7d3e34ca485d37e3cdbfe409203cVendor (CNA)
Linux Linux398aca2f90122d5abbabff1079deaeb885fe9e40Vendor (CNA)
Linux Linux6aaab2ace3f7b55733d904e5549acf8405f03642Vendor (CNA)
Linux Linux701c3ae7273e1adc20db5d97c42e0139b479f16bVendor (CNA)
Linux Linuxa536eb57be58442b19398b2783071007ecfb1735Vendor (CNA)
Linux Linuxb759d5bb6265419344ee9729fd0dc07ad85719d8Vendor (CNA)
Linux Linuxc645f6dd1af2ecc70fd3578e141f2f71fa9e4effVendor (CNA)
Linux Linuxe204e5c49a012f99638633fdbd773e3c86260053Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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.

—

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 (7 more)

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

All records