7.8

CVE-2022-49907: net: mdio: fix undefined behavior in bit shift for __mdiobus_register

Analyzed
AliasesUBUNTU-CVE-2022-49907DEBIAN-CVE-2022-49907
Published 01-05-2025Last modified 11-05-2026

Vulnerability summary

CVE-2022-49907 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.23%
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 1 · Related 1
SUSE-SU-2025:01983-1

Timeline

  1. 01-05-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: mdio: fix undefined behavior in bit shift for __mdiobus_register Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c __mdiobus_register+0x49d/0x4e0 fixed_mdio_bus_init+0xd8/0x12d do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu112 products
  • linuxAll versions (No fix recorded) | < 4.15.0-206.217 | < 5.4.0-139.156 | < 5.15.0-60.66
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1151.164 | < 5.4.0-1096.104 | < 5.15.0-1030.34
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7 | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 7006176a3c863e3e353ce1b8a349ef5bb1b9320e | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < a3fafc974be37319679f36dc4e7cca7db1e02973 | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 4954b5359eb141499492fadfab891e28905509e2 | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 634f066d02bdb22a26da7deb0c7617ab1a65fc9d | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 985a88bf0b27193522bba7856b1763f428cef19d | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0 | ≥ 4fd5f812c23c7deee6425f4a318e85c317cd1d6c, < 40e4eb324c59e11fcb927aa46742d28aba6ecb8a | 2.6.28
  • linux_kernel≥ 2.6.28, < 4.9.333 | ≥ 4.10, < 4.14.299 | ≥ 4.15, < 4.19.265 | ≥ 4.20, < 5.4.224 | ≥ 5.5, < 5.10.154 | ≥ 5.11, < 5.15.78 | ≥ 5.16, < 6.0.8 | 6.1:rc1 | 6.1:rc2 | 6.1:rc3
Debian1 product
  • linux< 6.0.8-1

3 vendors · 115 products

References

12 links
Show all 12 references