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CVE-2026-98124

Vulnerability in Linux kernel (CVE-2026-98124)

Summary

Vulnerability in Linux kernel (CVE-2026-98124). Risk of unauthorized operations or information disclosure.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

smb/client: invalidate fscache for fallocate range operations

smb3_zero_range(), smb3_punch_hole(), smb3_insert_range(), and
smb3_collapse_range() modify file contents through server-side range
operations. These operations discard the affected page cache, but leave
the FS-Cache cookie valid, so a later read may return data cached before
the range operation.

Fix this by invalidating FS-Cache after outstanding I/O has completed
and before modifying the file on the server.

Run the following as root on a CIFS mount with fsc enabled and an active
CacheFiles backend:

    bash -c '
            MNT=/mnt/cifs
            FILE="$MNT/repro"

            # Generate four 1 MiB random blocks: [A][B][C][D].
            dd if=/dev/urandom of=/tmp/src bs=1M count=4 status=none

            # Expected contents after zeroing B: [A][zero][C][D].
            cp /tmp/src /tmp/expected
            dd if=/dev/zero of=/tmp/expected bs=1M seek=1 count=1 \
                    conv=notrunc status=none
            cp /tmp/src "$FILE"

            # Populate FS-Cache, then discard the page cache.
            sync
            echo 1 > /proc/sys/vm/drop_caches
            cat "$FILE" > /dev/null
            sync
            echo 1 > /proc/sys/vm/drop_caches

            fallocate --zero-range -o 1M -l 1M "$FILE"

            if cmp -s /tmp/expected "$FILE"; then…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-98124 has been found in Linux kernel.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-98124" on the vendor's site.

CVE-2026-98124 (Linux kernel)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in Linux kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Linux Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"3.17.0"},{"fixed":"7.2.7"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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