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NVD / CVE Program· CNA Linux

CVE-2022-49940: tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()

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: 0.23% (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 309aea4b6b813f6678c3a547cfd7fe3a76ffa976, 5.15.66, 5.19.

Low priority for now. Upgrade to Linux Linux 309aea4b6b813f6678c3a547cfd7fe3a76ffa976, 5.15.66, 5.19 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: n_gsm: add sanity check for gsm->receive in gsm_receive_buf() A null pointer dereference can happen when attempting to access the "gsm->receive()" function in gsmld_receive_buf(). Currently, the code assumes that gsm->recieve is only called after MUX activation. Since the gsmld_receive_buf() function can be accessed without the need to initialize the MUX, the gsm->receive() function will not be set and a NULL pointer dereference will occur. Fix this by avoiding the call to "gsm->receive()" in case the function is not initialized by adding a sanity check. Call Trace: <TASK> gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 tiocsti drivers/tty/tty_io.c:2293 [inline] tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 18, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 14th 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%

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  • 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

Affected versions

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

  • linux linux kernel5.15.61 and later · before 5.15.66
  • linux linux kernel5.18.18 and later · before 5.19
  • linux linux kernel5.19.2 and later · before 5.19.8
  • linux linux kernel6.0

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

    • 2dc1be365a70699f7dda92fd9e48b84546086070affected
    • b8faa754b523a845facdc83120b2ecd290d7fa6d and later · before 5a82cf64f8ad63caf6bf115642ce44ddbc64311eaffected · git
    • dfa9b6d34aac2154b5e926d7a7a061123bf137c6 and later · before 309aea4b6b813f6678c3a547cfd7fe3a76ffa976affected · git
    • 5e59c010c6862da329db17acca086afd8bea1aa8 and later · before 5aa37f9510345a812c0998bcbbc4d88d1dcc4d8baffected · git
    • 01aecd917114577c423f07cec0d186ad007d76fc and later · before f16c6d2e58a4c2b972efcf9eb12390ee0ba3befbaffected · git
    • 5.18.18 and later · before 5.19affected · semver
    • 5.15.61 and later · before 5.15.66affected · semver
    • 5.19.2 and later · before 5.19.8affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.19.11-15.19.11-1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-abi-stablelistsbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfobefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-develbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-docbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-modulesbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-modules-extrabefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-toolsbefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-tools-debuginfobefore 0:4.18.0-553.el8_100:4.18.0-553.el8_10
Red Hat:enterprise_linux:8::baseoskernel-tools-libsbefore 0:4.18.0-553.el8_100:4.18.0-553.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-2022-49938Jun 18, 2025 · cifs: fix small mempool leak in SMB2_negotiate()
    22Monitor
  • ← EarlierCVE-2022-49939Jun 18, 2025 · binder: fix UAF of ref->proc caused by race condition
    28Monitor
  • Later →CVE-2022-49942Jun 18, 2025 · wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected
    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 Linux309aea4b6b813f6678c3a547cfd7fe3a76ffa976Vendor (CNA)
Linux Linux5.15.66Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux5.19.8Vendor (CNA)
Linux Linux5a82cf64f8ad63caf6bf115642ce44ddbc64311eVendor (CNA)
Linux Linux5aa37f9510345a812c0998bcbbc4d88d1dcc4d8bVendor (CNA)
Linux Linuxf16c6d2e58a4c2b972efcf9eb12390ee0ba3befbVendor (CNA)
debian:linux5.19.11-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:kernel0:4.18.0-553.123.1.el8_10.cloud.0.1 · Rocky Linux:8Package registry (OSV)
suse:kernel-64kb5.14.21-150500.55.113.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-default5.14.21-150500.55.113.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-default-base5.14.21-150500.55.113.1.150500.6.53.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-docs5.14.21-150500.55.113.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_281-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build5.14.21-150500.55.113.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-rt5.14.21-150500.13.100.2 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-source5.14.21-150500.55.113.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-source-rt5.14.21-150500.13.100.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

+2

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-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 (3 more)

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

All records