Linux: Out-of-bounds Read
CVE-2026-46037 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions b3a88fc5ae024d43c5ecf653f3bbe837e4a6dc99, 93df2af4f491de33827550b9d420f01808c0706b, 92e7c209036dcc0e8ffdf806fdfd3645b263bea5 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.51% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to b3a88fc5ae024d43c5ecf653f3bbe837e4a6dc99 or 93df2af4f491de33827550b9d420f01808c0706b or 92e7c209036dcc0e8ffdf806fdfd3645b263bea5 or bc64a66e0b9ad937d3d49934242ee62b01ba9a94, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.15.209 or 6.1.175 or 6.6.140 or 6.12.86, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, b3a88fc5ae024d43c5ecf653f3bbe837e4a6dc99; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, 93df2af4f491de33827550b9d420f01808c0706b; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, 92e7c209036dcc0e8ffdf806fdfd3645b263bea5; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, bc64a66e0b9ad937d3d49934242ee62b01ba9a94; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, c2178ff1c70ebfc2ab9651b230c58a34683db759; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1; d329ea5bd8845f0b196bf41b18b6173340d6e0e4 up to, but not including, 67bf002a2d7387a6312138210d0bd06e3cf4879b; 5.13 | b3a88fc5ae024d43c5ecf653f3bbe837e4a6dc99, 93df2af4f491de33827550b9d420f01808c0706b, 92e7c209036dcc0e8ffdf806fdfd3645b263bea5, bc64a66e0b9ad937d3d49934242ee62b01ba9a94, c2178ff1c70ebfc2ab9651b230c58a34683db759, d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) | V3.1.6 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) | V3.1.6 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) | V3.1.6 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) | V3.1.6 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | all versions | Not stated |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) | V3.1.6 and later; V3.1.7 and later | Not stated |
| Linux | Linux Kernel | 5.13 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.86; 6.13 up to, but not including, 6.18.27; 6.19 up to, but not including, 7.0.4 | 5.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: validate reply type before using icmp_pointers Extended echo replies use ICMP_EXT_ECHOREPLY as the outbound reply type. That value is outside the range covered by icmp_pointers[], which only describes the traditional ICMP types up to NR_ICMP_TYPES. Avoid consulting icmp_pointers[] for reply types outside that range, and use array_index_nospec() for the remaining in-range lookup. Normal ICMP replies keep their existing behavior unchanged.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/67bf002a2d7387a6312138210d0bd06e3cf4879b
- git.kernel.org/stable/c/92e7c209036dcc0e8ffdf806fdfd3645b263bea5
- git.kernel.org/stable/c/93df2af4f491de33827550b9d420f01808c0706b
- git.kernel.org/stable/c/b3a88fc5ae024d43c5ecf653f3bbe837e4a6dc99
- git.kernel.org/stable/c/bc64a66e0b9ad937d3d49934242ee62b01ba9a94
- git.kernel.org/stable/c/c2178ff1c70ebfc2ab9651b230c58a34683db759
- git.kernel.org/stable/c/d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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