Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-46043: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv

Noroxi assessment

Priority: Monitor (action score 36/100)

  • 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: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 2c0d71ef12f46c57d37bc571f3f2797db7eb50cc, 2fd4f8b749309a61c3f3f88ee8891d94f79e1240, 5fedefec757192dcaad29a664ac332c7601be144; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.

Low priority for now. Upgrade to Linux Linux 2c0d71ef12f46c57d37bc571f3f2797db7eb50cc, 2fd4f8b749309a61c3f3f88ee8891d94f79e1240, 5fedefec757192dcaad29a664ac332c7601be144; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.1
NVD has not scored this yet; the score shown is the CNA’s.

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.

Follow CVE-2026-46043

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.86
  • linux linux kernel6.13 and later · before 6.18.27
  • linux linux kernel6.19 and later · before 7.0.4

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
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before c4376c672c3648d5bdc31dfffc329d07164f93c4affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 5fedefec757192dcaad29a664ac332c7601be144affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 2c0d71ef12f46c57d37bc571f3f2797db7eb50ccaffected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 2fd4f8b749309a61c3f3f88ee8891d94f79e1240affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before f83519a4c122c9c7a850a2197648a9ff4c67c520affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 9b924f3a26b21330a837cfe72e819b6393bbeeaaaffected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before e8ee0e792d475b1067c199ef0af1b6221fa6f43daffected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 7244491dab347f648e661da96dc0febadd9daec3affected · git
    • before 4.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.166.1.el8_104.18.0-553.166.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.166.1.rt7.507.el8_104.18.0-553.166.1.rt7.507.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-2026-46038May 27, 2026 · net: qrtr: ns: Free the node during ctrl_cmd_bye()
    22Monitor
  • ← EarlierCVE-2026-46040May 27, 2026 · inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails
    22Monitor
  • Later →CVE-2026-46044May 27, 2026 · ipmi:ssif: Clean up kthread on errors
    22Monitor

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 Linux2c0d71ef12f46c57d37bc571f3f2797db7eb50ccVendor (CNA)
Linux Linux2fd4f8b749309a61c3f3f88ee8891d94f79e1240Vendor (CNA)
Linux Linux5fedefec757192dcaad29a664ac332c7601be144Vendor (CNA)
Linux Linux7244491dab347f648e661da96dc0febadd9daec3Vendor (CNA)
Linux Linux9b924f3a26b21330a837cfe72e819b6393bbeeaaVendor (CNA)
Linux Linuxc4376c672c3648d5bdc31dfffc329d07164f93c4Vendor (CNA)
Linux Linuxe8ee0e792d475b1067c199ef0af1b6221fa6f43dVendor (CNA)
Linux Linuxf83519a4c122c9c7a850a2197648a9ff4c67c520Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.49.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-687.49.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+18

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.

  • CVE-2026-460390 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-4632513 days apartRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
    39Monitor
  • CVE-2026-4334119 days apartnet/ipv6: ioam6: prevent schema length wraparound in trace fill
    39Monitor
  • CVE-2026-3163333 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-3164933 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-3165933 days apartbatman-adv: reject oversized global TT response buffers
    39Monitor

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records