CVE-2026-53355Network attack vector

Kernel compromise via stale RDS send pointer

Published Jul 1, 2026 · Updated Jul 1, 2026

Use-after-free in the Linux Kernel RDS/IB setup path allows remote attackers to corrupt kernel memory through connection requests. The rds_ib_setup_qp() unwind frees i_sends without nulling it when i_recvs allocation fails, so later teardown reuses and frees the stale send-ring pointer. Reachability requires an RDS/IB listener and the intervening allocation failure under resource pressure; resulting corruption can disclose kernel memory, alter execution, or crash the host.

CVSS severity9.8
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel RDS/IB setup path allows remote attackers to corrupt kernel memory through connection requests. The rds_ib_setup_qp() unwind frees i_sends without nulling it when i_recvs allocation fails, so later teardown reuses and frees the stale send-ring pointer. Reachability requires an RDS/IB listener and the intervening allocation failure under resource pressure; resulting corruption can disclose kernel memory, alter execution, or crash the host.

The record

CVE
CVE-2026-53355
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, CWE-825, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=13099ee9c7d54b0a25f6c8397675aed99e9cfa45
  2. Affected versionversion=3.18.74 <3.19
  3. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <1d4ec754ee3871f7e3670c67bb0298c9c5760926
  4. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <20cf0fb715c41111469577e85e35d15f099473e0
  5. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <27040bbca289a704eafcacca167d310c6ce2b1bc
  6. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <29d940026dce39e3018dab6f67c9427249321270
  7. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <2c5e5e4a5970c41f16e3ad801a78719ed5d5c71b
  8. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <66cccec111421a10efdc2c74499d15b93e7acae5
  9. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <e7cf30aa5f1fc6c2a86df65df8b731df20e44d79
  10. Affected versionversion=3b12f73a5c2977153f28a224392fd4729b50d1dc <f16ad421a4e3e7db2d14bdf3b16f583bc4f3b30a
  11. Affected versionversion=4.11
  12. Affected versionversion=4.1.46 <4.2
  13. Affected versionversion=4.4.91 <4.5
  14. Affected versionversion=4.9.54 <4.10
  15. Affected versionversion=5c6712ab4efb6cf60e16719ab6bcaface9cc268c
  16. Affected versionversion=75a12b2fa80c2e4cc40a9f9305f95899850b7426
  17. Affected versionversion=c9459693fae9a1bf3f51f3db98617f694112e897

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=13099ee9c7d54b0a25f6c8397675aed99e9cfa45; version=3.18.74 <3.19; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <1d4ec754ee3871f7e3670c67bb0298c9c5760926; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <20cf0fb715c41111469577e85e35d15f099473e0; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <27040bbca289a704eafcacca167d310c6ce2b1bc; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <29d940026dce39e3018dab6f67c9427249321270; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <2c5e5e4a5970c41f16e3ad801a78719ed5d5c71b; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <66cccec111421a10efdc2c74499d15b93e7acae5; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <e7cf30aa5f1fc6c2a86df65df8b731df20e44d79; version=3b12f73a5c2977153f28a224392fd4729b50d1dc <f16ad421a4e3e7db2d14bdf3b16f583bc4f3b30a; version=4.11; version=4.1.46 <4.2; version=4.4.91 <4.5; version=4.9.54 <4.10; version=5c6712ab4efb6cf60e16719ab6bcaface9cc268c; version=75a12b2fa80c2e4cc40a9f9305f95899850b7426; version=c9459693fae9a1bf3f51f3db98617f694112e897

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8kernel.orgCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-825Expired Pointer Dereference
T1210Exploitation of Remote Services

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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