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NVD / CVE Program· CNA Linux

CVE-2026-31546: net: bonding: fix NULL deref in bond_debug_rlb_hash_show

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.12% (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 017d674cf6930e9586a29ee808c7ca09d1396d07, 0a3f8cd3f370247ded14d38d216b49dd30eade76, 19f0fd87df0e5746b24f5caa465a66a8c6e6e241; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 017d674cf6930e9586a29ee808c7ca09d1396d07, 0a3f8cd3f370247ded14d38d216b49dd30eade76, 19f0fd87df0e5746b24f5caa465a66a8c6e6e241; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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: net: bonding: fix NULL deref in bond_debug_rlb_hash_show rlb_clear_slave intentionally keeps RLB hash-table entries on the rx_hashtbl_used_head list with slave set to NULL when no replacement slave is available. However, bond_debug_rlb_hash_show visites client_info->slave without checking if it's NULL. Other used-list iterators in bond_alb.c already handle this NULL-slave state safely: - rlb_update_client returns early on !client_info->slave - rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance compare slave values before visiting - lb_req_update_subnet_clients continues if slave is NULL The following NULL deref crash can be trigger in bond_debug_rlb_hash_show: [ 1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41) [ 1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286 [ 1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204 [ 1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078 [ 1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000 [ 1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0 [ 1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8 [ 1.294864] FS: 0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000 [ 1.295239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0 [ 1.295897] Call Trace: [ 1.296134] seq_read_iter (fs/seq_file.c:231) [ 1.296341] seq_read (fs/seq_file.c:164) [ 1.296493] full_proxy_read (fs/debugfs/file.c:378 (discriminator 1)) [ 1.296658] vfs_read (fs/read_write.c:572) [ 1.296981] ksys_read (fs/read_write.c:717) [ 1.297132] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) [ 1.297325] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Add a NULL check and print "(none)" for entries with no assigned slave.

Published
Apr 24, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th percentile

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.

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

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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

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

    • 2.6.38affected
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 19f0fd87df0e5746b24f5caa465a66a8c6e6e241affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before edacf1613f7b26423ebfa8b2892e7453c4235354affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 2ec2c777f357a83c3d503d8d9370c90b60f0ae63affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 0a3f8cd3f370247ded14d38d216b49dd30eade76affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 017d674cf6930e9586a29ee808c7ca09d1396d07affected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466caffected · git
    • caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 and later · before 605b52497bf89b3b154674deb135da98f916e390affected · git
    • before 2.6.38not affected · semver
Affected versions · NVD (9)

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

  • linux linux kernel2.6.38.1 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.20
  • linux linux kernel6.19 and later · before 6.19.10
  • linux linux kernel2.6.38
  • linux linux kernel7.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.35.1.160000.2.166.12.0-160000.35.1.160000.2.16
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.35.16.12.0-160000.35.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.35.16.12.0-160000.35.1
SUSE:Linux Enterprise High Availability Extension 16.0kernel-defaultbefore 6.12.0-160000.35.16.12.0-160000.35.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_16before 1-150700.15.3.21-150700.15.3.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_16before 1-150700.1.5.21-150700.1.5.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.60.1.150700.17.35.46.4.0-150700.53.60.1.150700.17.35.4
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1

+22

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-2026-31544Apr 24, 2026 · firmware: arm_scmi: Fix NULL dereference on notify error path
    22Monitor
  • ← EarlierCVE-2026-31545Apr 24, 2026 · NFC: nxp-nci: allow GPIOs to sleep
    22Monitor
  • Later →CVE-2026-31547Apr 24, 2026 · drm/xe: Fix missing runtime PM reference in ccs_mode_store
    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 Linux017d674cf6930e9586a29ee808c7ca09d1396d07Vendor (CNA)
Linux Linux0a3f8cd3f370247ded14d38d216b49dd30eade76Vendor (CNA)
Linux Linux19f0fd87df0e5746b24f5caa465a66a8c6e6e241Vendor (CNA)
Linux Linux2ec2c777f357a83c3d503d8d9370c90b60f0ae63Vendor (CNA)
Linux Linux605b52497bf89b3b154674deb135da98f916e390Vendor (CNA)
Linux Linux6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4Vendor (CNA)
Linux Linuxec9762f0df2f9fbe3f40a3bfa8aab8b2f721466cVendor (CNA)
Linux Linuxedacf1613f7b26423ebfa8b2892e7453c4235354Vendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.35.1.160000.2.16 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.35.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.35.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.35.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.35.1 · SUSE:Linux Enterprise High Availability Extension 16.0Package registry (OSV)
suse:kernel-default-base6.4.0-47.1.21.24 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-docs6.12.0-160000.35.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-47.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.35.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.35.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

+4

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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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)

CWE-476 · NULL Pointer Dereference

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.

References

Show all references (10 more)

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

All records