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

Deferred
AliasesUBUNTU-CVE-2022-50728DEBIAN-CVE-2022-50728
Published 24-12-2025Last modified 11-05-2026

Vulnerability summary

CVE-2022-50728 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 5
RHSA-2023:6583RHSA-2023:7077SUSE-SU-2026:0263-1SUSE-SU-2026:0316-1SUSE-SU-2026:0317-1SUSE-SU-2026:0411-1

Timeline

  1. 24-12-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu122 products
  • linuxAll versions (No fix recorded) | < 4.15.0-208.220 | < 5.4.0-144.161 | < 5.15.0-69.76
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1153.166 | < 5.4.0-1097.105 | < 5.15.0-1033.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.4-1
Linux1 product
  • linux≥ dc1f8bf68b311b1537cb65893430b6796118498a, < 7b4da3fcd513b8e67823eb80da37aad99b3339c1 | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < d49cc2b705711fb8fb849e7c660929b2100360b7 | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < e684215d8a903752e2b0cc946517fb61e57a880a | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < 20022d551f2064a194d8e0acb6cd7a85094a17b2 | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < ebc3c77785dc8b5b626309c0032a38fbb139287a | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < 5ad774fb823c24bbeb21a15a67103ea7a6f5b928 | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < 69669820844f81a77b6db24b86581320ae4d17af | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < cda74cdc280ba35c8993e7517bac5c257ff36f18 | ≥ dc1f8bf68b311b1537cb65893430b6796118498a, < bb16db8393658e0978c3f0d30ae069e878264fa3 | 2.6.32

3 vendors · 124 products

References

12 links
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