CVE-2026-52935

Kernel-memory disclosure via partial-send state reuse

Published Jun 24, 2026 · Updated Jun 24, 2026

An out-of-bounds read in Linux Kernel allows local users to disclose kernel memory through a crafted ESP-in-TCP send. espintcp_sendmsg() reinitializes emsg->skmsg and reuses ctx->partial after a blocking flush reports success while the prior transfer still owns that state, attaching a stale offset to the new message. Exploitation requires local low-privileged access to drive an ESP-in-TCP socket, retain a pending partial send by filling the TCP send buffer, and issue another send.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Linux Kernel allows local users to disclose kernel memory through a crafted ESP-in-TCP send. espintcp_sendmsg() reinitializes emsg->skmsg and reuses ctx->partial after a blocking flush reports success while the prior transfer still owns that state, attaching a stale offset to the new message. Exploitation requires local low-privileged access to drive an ESP-in-TCP socket, retain a pending partial send by filling the TCP send buffer, and issue another send.

The record

CVE
CVE-2026-52935
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=5.6
  2. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <1777ceac4bea5e568a5ad44b7f9bb219c1db21b6
  3. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <37487d55bf3300e3d2c1368da5c2bd3e3834ea4f
  4. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6564e9c7af7e1dc7bfe7f3093b728abe484d7630
  5. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3
  6. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <aa82a078f70f7ff88ba7d1017134e79d1ac140f2
  7. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ba21439302db9a82fe4edbed1e38a97271529421
  8. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <c381039ade2e161ab08c0eda73c4f8b9a7115928
  9. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <1777ceac4bea5e568a5ad44b7f9bb219c1db21b6; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <37487d55bf3300e3d2c1368da5c2bd3e3834ea4f; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6564e9c7af7e1dc7bfe7f3093b728abe484d7630; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <aa82a078f70f7ff88ba7d1017134e79d1ac140f2; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ba21439302db9a82fe4edbed1e38a97271529421; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <c381039ade2e161ab08c0eda73c4f8b9a7115928; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990

Published CVSS scores

6.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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