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CVE-2026-98833 Linux CVE debrief

A vulnerability in the Linux kernel's mtd (Memory Technology Devices) core has been addressed. The __get_mtd_device() function was calling the master's _get_device() callback with a potentially incorrect MTD device, specifically when dealing with partitions. This issue has been resolved by passing the master MTD to _get_device(), aligning it with _put_device().

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-18
Original CVE updated
2026-10-21
Advisory published
2026-10-18
Advisory updated
2026-10-21

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using affected versions, should assess exposure and prioritize patching. This includes operators managing Linux kernel deployments, platform administrators, vulnerability management teams, and security teams responsible for monitoring and mitigating vulnerabilities in their environments.

Why it matters

A vulnerability in the Linux kernel's mtd core has been addressed. Defenders should prioritize verifying and applying patches for affected Linux kernel versions.

  • Verify patch application for vulnerable Linux kernel versions
  • Assess system inventory for affected versions
  • Monitor Linux kernel updates for additional patches

Technical summary

The Linux kernel's mtd core had a vulnerability where __get_mtd_device() called the master's _get_device() callback with an incorrect MTD device, potentially leading to issues with gluebi partitions. The fix involves passing the master MTD to _get_device(). This change ensures that gluebi partitions function correctly by using the master MTD device. Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability. The specific commits addressing the vulnerability are d94731cafa57e2c986ff391122d1494e5a3f3c3f, 95c8f36293c22d450c371167ad4f9a5bbadc7539, f971f1c63cf71579258360a12bd185bc1cd1a043, dc482a281a19a7d7e91ad1b2d551bb301c54d0e6, and 12b31d1acd20b3185bb5f0748

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly those versions explicitly mentioned as vulnerable in the source records.

Recommended defensive actions

  • Verify Linux kernel versions for vulnerability and apply patches if necessary
  • Review system inventory for affected Linux kernel versions
  • Monitor Linux kernel updates for additional patches
  • Assess system exposure to vulnerable Linux kernel versions
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The source corpus provides details on the specific commits that address the vulnerability, including d94731cafa57e2c986ff391122d1494e5a3f3c3f, 95c8f36293c22d450c371167ad4f9a5bbadc7539, f971f1c63cf71579258360a12bd185bc1cd1a043, dc482a281a19a7d7e91ad1b2d551bb301c54d0e6, and 12b31d1acd20b3185bb5f0748db0cf6874c8e9d1. These commits are part of the Linux kernel's stable branch and are relevant for assessing the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-98833 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-98833

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-98833 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-98833

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • mtd: core: call _get_device() with the master MTD

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/98xxx/CVE-2026-98833.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/d94731cafa57e2c986ff391122d1494e5a3f3c3f

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/95c8f36293c22d450c371167ad4f9a5bbadc7539

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f971f1c63cf71579258360a12bd185bc1cd1a043

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/dc482a281a19a7d7e91ad1b2d551bb301c54d0e6

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/12b31d1acd20b3185bb5f0748db0cf6874c8e9d1

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.