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NVD / CVE Program· CNA Linux

CVE-2022-50728: s390/lcs: Fix return type of lcs_start_xmit()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.28% (FIRST EPSS).
  • Fixed version: Linux Linux 20022d551f2064a194d8e0acb6cd7a85094a17b2, 5ad774fb823c24bbeb21a15a67103ea7a6f5b928, 69669820844f81a77b6db24b86581320ae4d17af.

Low priority for now. Upgrade to Linux Linux 20022d551f2064a194d8e0acb6cd7a85094a17b2, 5ad774fb823c24bbeb21a15a67103ea7a6f5b928, 69669820844f81a77b6db24b86581320ae4d17af 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: s390/lcs: Fix return type of lcs_start_xmit() With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals: drivers/s390/net/lcs.c:2090:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ drivers/s390/net/lcs.c:2097:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ ->ndo_start_xmit() in 'struct net_device_ops' expects a return type of 'netdev_tx_t', not 'int'. Adjust the return type of lcs_start_xmit() to match the prototype's to resolve the warning and potential CFI failure, should s390 select ARCH_SUPPORTS_CFI_CLANG in the future.

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 21th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 2.6.32affected
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before 7b4da3fcd513b8e67823eb80da37aad99b3339c1affected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before d49cc2b705711fb8fb849e7c660929b2100360b7affected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before e684215d8a903752e2b0cc946517fb61e57a880aaffected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before 20022d551f2064a194d8e0acb6cd7a85094a17b2affected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before ebc3c77785dc8b5b626309c0032a38fbb139287aaffected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before 5ad774fb823c24bbeb21a15a67103ea7a6f5b928affected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before 69669820844f81a77b6db24b86581320ae4d17afaffected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before cda74cdc280ba35c8993e7517bac5c257ff36f18affected · git
    • dc1f8bf68b311b1537cb65893430b6796118498a and later · before bb16db8393658e0978c3f0d30ae069e878264fa3affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.290.14.12.14-122.290.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_76before 1-8.7.11-8.7.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.290.14.12.14-122.290.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.290.14.12.14-122.290.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-50726Dec 24, 2025 · net/mlx5: Fix possible use-after-free in async command interface
    31Monitor
  • ← EarlierCVE-2022-50727Dec 24, 2025 · scsi: efct: Fix possible memleak in efct_device_init()
    0Monitor
  • Later →CVE-2022-50729Dec 24, 2025 · ksmbd: Fix resource leak in ksmbd_session_rpc_open()
    0Monitor

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 Linux20022d551f2064a194d8e0acb6cd7a85094a17b2Vendor (CNA)
Linux Linux5ad774fb823c24bbeb21a15a67103ea7a6f5b928Vendor (CNA)
Linux Linux69669820844f81a77b6db24b86581320ae4d17afVendor (CNA)
Linux Linux7b4da3fcd513b8e67823eb80da37aad99b3339c1Vendor (CNA)
Linux Linuxbb16db8393658e0978c3f0d30ae069e878264fa3Vendor (CNA)
Linux Linuxcda74cdc280ba35c8993e7517bac5c257ff36f18Vendor (CNA)
Linux Linuxd49cc2b705711fb8fb849e7c660929b2100360b7Vendor (CNA)
Linux Linuxe684215d8a903752e2b0cc946517fb61e57a880aVendor (CNA)
Linux Linuxebc3c77785dc8b5b626309c0032a38fbb139287aVendor (CNA)
debian:linux6.1.4-1 · Debian:12Package registry (OSV)
suse:kernel-default4.12.14-122.290.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.290.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.290.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_761-8.7.1 · 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.

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.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (8 more)

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

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