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Linux KernelOperating system · Linux

CVE-2023-1077

HIGH · 7.0 CVSS v3.1 Published 2023-03-27
Fix available
A fix is available. Upgrade to 4.19.293 / 5.4.235 or later.
See remediation →
72/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, pick_next_rt_entity() may return a type confused entry, not detected by the BUG_ON condition, as the confused entry will not be NULL, but list_head.The buggy error condition would lead to a type confused entry with the list head,which would then be used as a type confused sched_rt_entity,causing memory corruption.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-843

A resource is accessed as one type when it was actually allocated as another, so the code misreads memory layout — in interpreters and language runtimes this is frequently a direct path to code execution. It often arises from unchecked casts on attacker-influenced objects. The fix is strict type checks before casts and memory-safe access patterns.

General guidance for the type confusion class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 2.6.25, < 4.19.293>= 4.20, < 5.4.235>= 5.5, < 5.10.173>= 5.11, < 5.15.99>= 5.16, < 6.1.16>= 6.2, < 6.2.3
Debian LinuxOperating system
Affected:= 10.0
A700s FirmwareOperating system
Affected:all versions
8300 FirmwareOperating system
Affected:all versions
8700 FirmwareOperating system
Affected:all versions
A400 FirmwareOperating system
Affected:all versions
C400 FirmwareOperating system
Affected:all versions
H300s FirmwareOperating system
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.19.293 / 5.4.235 / 5.10.173 or later
Fixed in 4.19.2935.4.2355.10.173
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel: upgrade to 4.19.293+/5.4.235+/5.10.173+/5.15.99+ depending on your branch; Debian 10: apply latest Debian LTS kernel update

  1. Identify the currently running Linux kernel version using 'uname -r'
  2. Check if your kernel version falls within the affected ranges: < 4.19.293, < 5.4.235, < 5.10.173, or < 5.15.99
  3. For Linux Kernel: Upgrade to kernel version 4.19.293 or later (for 4.19.x), 5.4.235 or later (for 5.4.x), 5.10.173 or later (for 5.10.x), or 5.15.99 or later (for 5.15.x)
  4. For Debian 10 (Buster): Apply Debian kernel security updates from the Debian security repository
  5. For router firmware products (A700s, 8300, 8700, A400, C400, H300s): Contact the device vendor for firmware updates containing the kernel fix
  6. Reboot the system after applying the kernel update
Caveat Kernel upgrades may require system reboot and could have compatibility implications with proprietary kernel modules or specific hardware drivers

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-1077 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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