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NVD / CVE Program· CNA Linux

CVE-2022-49768: 9p: trans_fd/p9_conn_cancel: drop client lock earlier

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: 0.39% (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 4.14.300, 4.19, 4.9.334.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 4.14.300, 4.19, 4.9.334 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: 9p: trans_fd/p9_conn_cancel: drop client lock earlier syzbot reported a double-lock here and we no longer need this lock after requests have been moved off to local list: just drop the lock earlier.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Aug 5, 2026
EPSS
0.3% · 33th 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 · 0.3%

CNA vs NVD score

NVD
5.5
CNA · Linux
7.5
2.0 point gap

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

Follow CVE-2022-49768

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 kernel4.9.127 and later · before 4.9.334
  • linux linux kernel4.14.70 and later · before 4.14.300
  • linux linux kernel4.18.8 and later · before 4.19.267
  • linux linux kernel4.20 and later · before 5.4.225
  • linux linux kernel5.5 and later · before 5.10.156
  • linux linux kernel5.11 and later · before 5.15.80
  • linux linux kernel5.16 and later · before 6.0.10

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

    • 91ca7c5644c370dc5132b1db1aea81416a4b2181, 4.19affected
    • eb1ca07f4343b4e58b97e792a85d5ba1ba103f5d and later · before 82825dbf393f7c7979d462f9609a15bde8092b3faffected · git
    • 4cd195263e420311d31451cc053fde8037f326f1 and later · before e3031280fe4eaf61a09e60823331f81f321be8e1affected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before fec1406f5e7ab20b71f6d231792b0040e3300aafaffected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before 96760723aae1b45f733f702abb4333137143909faffected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before f14858bc77c567e089965962877ee726ffad0556affected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before a4f1a01b2e81378fce9ca528d4d8a049e4b58fcdaffected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before 612c977f5d481f551d03d83d0aef588845c1300caffected · git
    • 9f476d7c540cb57556d3cc7e78704e6cd5100f5f and later · before 52f1c45dde9136f964d63a77d19826c8a74e2c7faffected · git
    • 4.9.127 and later · before 4.9.334affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.10-16.0.10-1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.269.14.12.14-122.269.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_71before 1-8.3.11-8.3.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.269.14.12.14-122.269.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.269.14.12.14-122.269.1

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-2022-49766May 1, 2025 · netlink: Bounds-check struct nlmsgerr creation
    22Monitor
  • ← EarlierCVE-2022-49767May 1, 2025 · 9p/trans_fd: always use O_NONBLOCK read/write
    22Monitor
  • Later →CVE-2022-49769May 1, 2025 · gfs2: Check sb_bsize_shift after reading superblock
    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 Linux4.14.300Vendor (CNA)
Linux Linux4.19Vendor (CNA)
Linux Linux4.9.334Vendor (CNA)
Linux Linux52f1c45dde9136f964d63a77d19826c8a74e2c7fVendor (CNA)
Linux Linux612c977f5d481f551d03d83d0aef588845c1300cVendor (CNA)
Linux Linux82825dbf393f7c7979d462f9609a15bde8092b3fVendor (CNA)
Linux Linux96760723aae1b45f733f702abb4333137143909fVendor (CNA)
Linux Linuxa4f1a01b2e81378fce9ca528d4d8a049e4b58fcdVendor (CNA)
Linux Linuxe3031280fe4eaf61a09e60823331f81f321be8e1Vendor (CNA)
Linux Linuxf14858bc77c567e089965962877ee726ffad0556Vendor (CNA)
Linux Linuxfec1406f5e7ab20b71f6d231792b0040e3300aafVendor (CNA)
debian:linux6.0.10-1 · Debian:12Package registry (OSV)
suse:kernel-default4.12.14-122.269.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.269.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.269.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_711-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-667 · Improper Locking

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.

Change log

  1. 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