CVE-2026-23172

Kernel memory corruption via excessive modem fragments

Published Feb 14, 2026 · Updated Feb 14, 2026

Buffer overflow in the Linux Kernel t7xx WWAN driver allows attackers controlling modem firmware to corrupt kernel memory. The t7xx_dpmaif_set_frag_to_skb function adds page fragments to skb_shinfo(skb)->frags without checking nr_frags against MAX_SKB_FRAGS. A malicious, buggy, or compromised PCIe modem must supply excessive fragments; adjacent memory corruption can crash the kernel or produce undefined behavior.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the Linux Kernel t7xx WWAN driver allows attackers controlling modem firmware to corrupt kernel memory. The t7xx_dpmaif_set_frag_to_skb function adds page fragments to skb_shinfo(skb)->frags without checking nr_frags against MAX_SKB_FRAGS. A malicious, buggy, or compromised PCIe modem must supply excessive fragments; adjacent memory corruption can crash the kernel or produce undefined behavior.

The record

CVE
CVE-2026-23172
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19
  2. Affected versionversion=d642b012df70a76dd5723f2d426b40bffe83ac49 <2a0522f564acd34442652ea083091c329fa7c5d5
  3. Affected versionversion=d642b012df70a76dd5723f2d426b40bffe83ac49 <2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba
  4. Affected versionversion=d642b012df70a76dd5723f2d426b40bffe83ac49 <af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276
  5. Affected versionversion=d642b012df70a76dd5723f2d426b40bffe83ac49 <f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6
  6. Affected versionversion=d642b012df70a76dd5723f2d426b40bffe83ac49 <f9747a7521a48afded5bff2faf1f2dcfff48c577

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=d642b012df70a76dd5723f2d426b40bffe83ac49 <2a0522f564acd34442652ea083091c329fa7c5d5; version=d642b012df70a76dd5723f2d426b40bffe83ac49 <2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba; version=d642b012df70a76dd5723f2d426b40bffe83ac49 <af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276; version=d642b012df70a76dd5723f2d426b40bffe83ac49 <f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6; version=d642b012df70a76dd5723f2d426b40bffe83ac49 <f9747a7521a48afded5bff2faf1f2dcfff48c577

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.4Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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