Medium

Linux kernel blk_ioctl_discard() integer overflow

IdentifiersCVE-2024-36917CWE-190· Integer Overflow or Wraparound

CVE-2024-36917 is an integer-overflow vulnerability in the Linux kernel block layer's blk_ioctl_discard() function. The function did not validate overflow when calculating the end of a discard range as start plus len. An attacker able to submit a discard ioctl with specially chosen large range values can cause this arithmetic calculation to wrap. The upstream fix adds overflow validation for the requested discard range.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A crafted discard ioctl can cause a kernel task to hang, resulting in denial of service. The available information specifically demonstrates a hung-task condition; it does not establish code execution, privilege escalation, or data disclosure.

Mitigation

If you can’t patch tonight, do this now.

No temporary workaround is documented. Until an updated kernel can be deployed, restrict access to block devices and to interfaces that permit discard ioctl submission, particularly for untrusted local users or workloads. Reboot after applying the kernel update.

Remediation

Patch, then assume compromise.

Install a vendor kernel update containing the upstream blk_ioctl_discard() overflow validation and reboot to load the updated kernel. Red Hat remediated the issue in updates for RHEL 8 and RHEL 9, including RHEL 9.4 kernel version 5.14.0-427.74.1.el9_4. SUSE also issued a kernel update for affected SUSE Linux Enterprise 15 SP5 products.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

LinuxLinux Kerneloperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

redhat accessNews

Jan 1, 2026

RHSA-2025:9584 - Security Advisory - Red Hat Customer Portal

Linux kernel block-layer integer-overflow issue in blk_ioctl_discard().

bugzilla redhatNews

Aug 8, 2024

2284519 - (CVE-2024-36917) CVE-2024-36917 kernel: block: fix overflow in blk_ioctl_discard()

A Linux kernel block-layer vulnerability involving an integer overflow in blk_ioctl_discard(). The issue was resolved upstream and subsequently addressed through Red Hat Enterprise Linux 8, RHEL 9, and RHEL 9.4 Extended Update Support advisories.

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity