Linux: Out-of-bounds Read
CVE-2026-31395 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8, b7c7a275447c6d4bf4a36a134682e2e4e20efd4b, 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 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 0.12% 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 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8 or b7c7a275447c6d4bf4a36a134682e2e4e20efd4b or 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.18.20 or 6.19.10, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 up to, but not including, 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8; 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 up to, but not including, b7c7a275447c6d4bf4a36a134682e2e4e20efd4b; 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 up to, but not including, 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3; 6.13 | 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8, b7c7a275447c6d4bf4a36a134682e2e4e20efd4b, 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 |
| Linux | Linux Kernel | 6.13 up to, but not including, 6.18.20; 6.19 up to, but not including, 6.19.10; 7.0 | 6.18.20, 6.19.10 |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler The ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in bnxt_async_event_process() uses a firmware-supplied 'type' field directly as an index into bp->bs_trace[] without bounds validation. The 'type' field is a 16-bit value extracted from DMA-mapped completion ring memory that the NIC writes directly to host RAM. A malicious or compromised NIC can supply any value from 0 to 65535, causing an out-of-bounds access into kernel heap memory. The bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte and writes to bs_trace->last_offset and bs_trace->wrapped, leading to kernel memory corruption or a crash. Fix by adding a bounds check and defining BNXT_TRACE_MAX as DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently defined firmware trace types (0x0 through 0xc).
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: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 8.1 High severity
- 8.2 High severity
- 9.1 Critical severity
- 7.5 High severity
- 8.2 High severity
- 7.5 High severity
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