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NVD / CVE Program· CNA Linux

CVE-2022-49307: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()

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: 0.29% (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 078212ad15dbd88840c82c97f12c93d83703c8fd, 1ceb4ca9543a8a788febf6bc8dad2e605e172d5e, 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d.

Low priority for now. Upgrade to Linux Linux 078212ad15dbd88840c82c97f12c93d83703c8fd, 1ceb4ca9543a8a788febf6bc8dad2e605e172d5e, 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d 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: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat: [ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] <TASK> [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] Fix this by checking whether the 'info->netdev' is a null pointer first.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 21th 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.

Follow CVE-2022-49307

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 kernelbefore 4.9.318
  • linux linux kernel4.10 and later · before 4.14.283
  • linux linux kernel4.15 and later · before 4.19.247
  • linux linux kernel4.20 and later · before 5.4.198
  • linux linux kernel5.5 and later · before 5.10.122
  • linux linux kernel5.11 and later · before 5.15.47
  • linux linux kernel5.16 and later · before 5.17.15
  • linux linux kernel5.18 and later · before 5.18.4

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

    • 2.6.16affected
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0daffected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before 078212ad15dbd88840c82c97f12c93d83703c8fdaffected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before ba08cbc5b53e151d0acf1930fb526fc65b7f3e65affected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before f6e07eb7ebec53ffe81fc2489589320fbe4a6b75affected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before d68d5e68b7f64de7170f8e04dd9b995c36b2c71caffected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before 8a95696bdc0e13f8980f05b54a3b9081963d1256affected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before ddd67751ab86c6a65f95c35293c42f85a42ac05daffected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before 1ceb4ca9543a8a788febf6bc8dad2e605e172d5eaffected · git
    • 705b6c7b34f2621f95f606d0e683daa10cdb8eb9 and later · before 689ca31c542687709ba21ec2195c1fbce34fd029affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.5-15.18.5-1

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-2022-49305Feb 26, 2025 · drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop()
    22Monitor
  • ← EarlierCVE-2022-49306Feb 26, 2025 · usb: dwc3: host: Stop setting the ACPI companion
    22Monitor
  • Later →CVE-2022-49308Feb 26, 2025 · extcon: Modify extcon device to be created after driver data is set
    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 Linux078212ad15dbd88840c82c97f12c93d83703c8fdVendor (CNA)
Linux Linux1ceb4ca9543a8a788febf6bc8dad2e605e172d5eVendor (CNA)
Linux Linux50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0dVendor (CNA)
Linux Linux689ca31c542687709ba21ec2195c1fbce34fd029Vendor (CNA)
Linux Linux8a95696bdc0e13f8980f05b54a3b9081963d1256Vendor (CNA)
Linux Linuxba08cbc5b53e151d0acf1930fb526fc65b7f3e65Vendor (CNA)
Linux Linuxd68d5e68b7f64de7170f8e04dd9b995c36b2c71cVendor (CNA)
Linux Linuxddd67751ab86c6a65f95c35293c42f85a42ac05dVendor (CNA)
Linux Linuxf6e07eb7ebec53ffe81fc2489589320fbe4a6b75Vendor (CNA)
debian:linux5.18.5-1 · 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 (8 more)

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

All records