VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-89528: Linux kernel · svcrdma: Reject Read lists that exceed the page budget

Affects Linux kernelSource CVE Database V5

Not known to be exploited · CVSS 7.5 High · fixed in e70fdb121171c3eb0ac34eb545721828cd737717 : patch Linux kernel soon.

Data as of 26 Oct 2026, 19:47 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS

0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers can reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-10-16.

Patch

Available – fixed in e70fdb121171c3eb0ac34eb545721828cd737717, beb4e9801f6362436102acc4cc5304b7324f9365, 465f511f59a0fa7a80d5d1073c4b24f28ea38f58 +2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 026d958b38c628a1b4ced534808945365e2747a5, < e70fdb121171c3eb0ac34eb545721828cd737717	Fixed in e70fdb121171c3eb0ac34eb545721828cd737717
LinuxLinux	Affected ≥ 026d958b38c628a1b4ced534808945365e2747a5, < beb4e9801f6362436102acc4cc5304b7324f9365	Fixed in beb4e9801f6362436102acc4cc5304b7324f9365
LinuxLinux	Affected ≥ 026d958b38c628a1b4ced534808945365e2747a5, < 465f511f59a0fa7a80d5d1073c4b24f28ea38f58	Fixed in 465f511f59a0fa7a80d5d1073c4b24f28ea38f58
LinuxLinux	Affected ≥ 026d958b38c628a1b4ced534808945365e2747a5, < 1a3af2262cb384112ef38632de4690682be528b4	Fixed in 1a3af2262cb384112ef38632de4690682be528b4
LinuxLinux	Affected ≥ 026d958b38c628a1b4ced534808945365e2747a5, < 0ca487abb3bdf581851664b5db21f364caf57682	Fixed in 0ca487abb3bdf581851664b5db21f364caf57682
LinuxLinux	Affected =4.13	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel. The vulnerability is resolved by rejecting Read lists that exceed the page budget at decode time. Users should update to a fixed Linux kernel version that includes the patches identified by the commit hashes in the established facts. No additional mitigation is required beyond applying the official fix.

Description

CVE-2026-89528 is a high-severity vulnerability in the Linux kernel's svcrdma component where the system fails to properly reject Read lists that exceed the allocated page budget. This can lead to a NULL pointer dereference during DMA mapping, causing a denial of service. The flaw arises because multiple Read segments can cumulatively exceed the rq_pages array budget, bypassing runtime guards. The issue has been fixed by validating the total page count across all Read segments at decode time and rejecting messages that would overflow the page budget.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 19:47 UTC

Technical details

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