Riskcovery

CVE-2022-50212

netfilter: nf_tables: do not allow CHAIN_ID to refer to another table

State
Published
Severity
7.8 High
Published
Jun 18, 2025
Updated
Aug 5, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: do not allow CHAIN_ID to refer to another table

When doing lookups for chains on the same batch by using its ID, a chain from a different table can be used. If a rule is added to a table but refers to a chain in a different table, it will be linked to the chain in table2, but would have expressions referring to objects in table1.

Then, when table1 is removed, the rule will not be removed as its linked to a chain in table2. When expressions in the rule are processed or removed, that will lead to a use-after-free.

When looking for chains by ID, use the table that was used for the lookup by name, and only return chains belonging to that same table.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 837830a4b439bfeb86c70b0115c280377c84714b to before 9e7dcb88ec8e85e4a8ad0ea494ea2f90f32d2583Affected
  • 837830a4b439bfeb86c70b0115c280377c84714b to before 91501513016903077f91033fa5d2aa26cac399b2Affected
  • 837830a4b439bfeb86c70b0115c280377c84714b to before 0f49613a213d918af790c1276f79da741968de11Affected
  • 837830a4b439bfeb86c70b0115c280377c84714b to before 58e863f64ee3d0879297e5e53b646e4b91e59620Affected
  • 837830a4b439bfeb86c70b0115c280377c84714b to before 95f466d22364a33d183509629d0879885b4f547eAffected
LinuxLinux
  • 5.9Affected
  • before 5.9Not affected
  • 5.10.137 through 5.10.*Not affected
  • 5.15.61 through 5.15.*Not affected
  • 5.18.18 through 5.18.*Not affected
  • 5.19.2 through 5.19.*Not affected
  • 6.0 and laterNot affected

References

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