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NVD / CVE Program· CNA Linux

CVE-2023-53539: RDMA/rxe: Fix incomplete state save in rxe_requester

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 255c0e60e1d16874fc151358d94bc8df661600dd, 2f2a6422287fe29f9343247d77b645100ece0652, 5d122db2ff80cd2aed4dcd630befb56b51ddf947.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 255c0e60e1d16874fc151358d94bc8df661600dd, 2f2a6422287fe29f9343247d77b645100ece0652, 5d122db2ff80cd2aed4dcd630befb56b51ddf947 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix incomplete state save in rxe_requester If a send packet is dropped by the IP layer in rxe_requester() the call to rxe_xmit_packet() can fail with err == -EAGAIN. To recover, the state of the wqe is restored to the state before the packet was sent so it can be resent. However, the routines that save and restore the state miss a significnt part of the variable state in the wqe, the dma struct which is used to process through the sge table. And, the state is not saved before the packet is built which modifies the dma struct. Under heavy stress testing with many QPs on a fast node sending large messages to a slow node dropped packets are observed and the resent packets are corrupted because the dma struct was not restored. This patch fixes this behavior and allows the test cases to succeed.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 4, 2025
Updated
Aug 5, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.8.1 and later · before 6.1.53
  • linux linux kernel6.2 and later · before 6.4.16
  • linux linux kernel6.5 and later · before 6.5.3
  • linux linux kernel4.8

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.8affected
    • 3050b99850247695cb07a5c15265afcc08bcf400 and later · before 70518f3aaf5a059b691867d7d2d46b999319656aaffected · git
    • 3050b99850247695cb07a5c15265afcc08bcf400 and later · before 2f2a6422287fe29f9343247d77b645100ece0652affected · git
    • 3050b99850247695cb07a5c15265afcc08bcf400 and later · before 255c0e60e1d16874fc151358d94bc8df661600ddaffected · git
    • 3050b99850247695cb07a5c15265afcc08bcf400 and later · before 5d122db2ff80cd2aed4dcd630befb56b51ddf947affected · git
    • before 4.8not affected · semver
    • 6.1.53 and later · up to and including 6.1.*not affected · semver
    • 6.4.16 and later · up to and including 6.4.*not affected · semver
    • 6.5.3 and later · up to and including 6.5.*not affected · semver
    • 6.6 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.89.1.el8_104.18.0-553.89.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.89.1.rt7.430.el8_104.18.0-553.89.1.rt7.430.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-53536Oct 4, 2025 · blk-crypto: make blk_crypto_evict_key() more robust
    31Monitor
  • ← EarlierCVE-2023-53537Oct 4, 2025 · f2fs: fix to avoid use-after-free for cached IPU bio
    31Monitor
  • Later →CVE-2023-53541Oct 4, 2025 · mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux255c0e60e1d16874fc151358d94bc8df661600ddVendor (CNA)
Linux Linux2f2a6422287fe29f9343247d77b645100ece0652Vendor (CNA)
Linux Linux5d122db2ff80cd2aed4dcd630befb56b51ddf947Vendor (CNA)
Linux Linux70518f3aaf5a059b691867d7d2d46b999319656aVendor (CNA)
almalinux:bpftool4.18.0-553.89.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.89.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.89.1.rt7.430.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.55-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.78.1.150600.12.34.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.89.1.rt7.430.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+28

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records