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NVD / CVE Program· CNA Linux

CVE-2022-49904: net, neigh: Fix null-ptr-deref in neigh_table_clear()

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: 0.20% (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 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0, 1c89642e7f2b7ecc9635610653f5c2f0276c0051, 2b45d6d0c41cb9593868e476681efb1aae5078a1.

Low priority for now. Upgrade to Linux Linux 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0, 1c89642e7f2b7ecc9635610653f5c2f0276c0051, 2b45d6d0c41cb9593868e476681efb1aae5078a1 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, neigh: Fix null-ptr-deref in neigh_table_clear() When IPv6 module gets initialized but hits an error in the middle, kenel panic with: KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 10th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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 kernel4.14.292 and later · before 4.14.299
  • linux linux kernel4.19.257 and later · before 4.19.265
  • linux linux kernel5.4.212 and later · before 5.4.224
  • linux linux kernel5.10.141 and later · before 5.10.154
  • linux linux kernel5.15.65 and later · before 5.15.78
  • linux linux kernel5.19.7 and later · before 6.0.8
  • linux linux kernel6.1

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

    • 2dd5ed474115150d8175825bc3b56c6385c3a83b, 6.0affected
    • 9bbaed571c4bf1b62ac8703cb359dc090efc3455 and later · before 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0affected · git
    • 05fdce1ae744dee43c9181fd063c9c0db4f777f2 and later · before b736592de2aa53aee2d48d6b129bc0c892007bbeaffected · git
    • 51be9dd391fd25872b95708a0250f2f7722d2d8e and later · before b49f6b2f21f543d4dc88fb7b1ec2adccb822f27caffected · git
    • c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 and later · before 1c89642e7f2b7ecc9635610653f5c2f0276c0051affected · git
    • db6fa03d80ab076238fc806c9925d1f8b9639d1b and later · before 2b45d6d0c41cb9593868e476681efb1aae5078a1affected · git
    • 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 and later · before a99a8ec4c62180c889482a2ff6465033e0743458affected · git
    • 66ba215cb51323e4e55e38fd5f250e0fae0cbc94 and later · before f8017317cb0b279b8ab98b0f3901a2e0ac880dadaffected · git
    • 4.14.292 and later · before 4.14.299affected · semver
    • 4.19.257 and later · before 4.19.265affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.8-16.0.8-1

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-2022-49902May 1, 2025 · block: Fix possible memory leak for rq_wb on add_disk failure
    22Monitor
  • ← EarlierCVE-2022-49903May 1, 2025 · ipv6: fix WARNING in ip6_route_net_exit_late()
    22Monitor
  • Later →CVE-2022-49906May 1, 2025 · ibmvnic: Free rwi on reset success
    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 Linux0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0Vendor (CNA)
Linux Linux1c89642e7f2b7ecc9635610653f5c2f0276c0051Vendor (CNA)
Linux Linux2b45d6d0c41cb9593868e476681efb1aae5078a1Vendor (CNA)
Linux Linux4.14.299Vendor (CNA)
Linux Linux4.19.265Vendor (CNA)
Linux Linux5.10.154Vendor (CNA)
Linux Linux5.15.78Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux5.4.224Vendor (CNA)
Linux Linuxa99a8ec4c62180c889482a2ff6465033e0743458Vendor (CNA)
Linux Linuxb49f6b2f21f543d4dc88fb7b1ec2adccb822f27cVendor (CNA)
Linux Linuxb736592de2aa53aee2d48d6b129bc0c892007bbeVendor (CNA)
Linux Linuxf8017317cb0b279b8ab98b0f3901a2e0ac880dadVendor (CNA)
debian:linux6.0.8-1 · Debian:12Package registry (OSV)

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)

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records