Linux: Update kernel to 6.18.26

[sairon]

• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.25
• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.26

Summary by CodeRabbit

• Chores
  • Updated Linux kernel version from 6.18.24 to 6.18.26 across all supported platforms and devices, including home automation systems, development boards, and virtual appliances. Documentation updated to reflect kernel version changes.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR updates the mainline Linux kernel version from 6.18.24 to 6.18.26 across documentation and buildroot configuration files for multiple hardware platforms including generic aarch64/x86-64 architectures, Home Assistant Green, Khadas VIM3, ODROID variants, and Open Virtual Appliance.

Changes

Cohort / File(s)	Summary
Documentation Documentation/kernel.md	Updated kernel version references in the mainline Linux documentation table from 6.18.24 to 6.18.26 for five target platforms.
Buildroot Generic Platform Configs buildroot-external/configs/generic_aarch64_defconfig, buildroot-external/configs/generic_x86_64_defconfig	Updated BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE from 6.18.24 to 6.18.26 for generic x86-64 and aarch64 architectures.
Buildroot ODROID Platform Configs buildroot-external/configs/odroid_c2_defconfig, buildroot-external/configs/odroid_c4_defconfig, buildroot-external/configs/odroid_m1_defconfig, buildroot-external/configs/odroid_m1s_defconfig, buildroot-external/configs/odroid_n2_defconfig	Updated BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE from 6.18.24 to 6.18.26 for all ODROID variants (C2, C4, M1, M1S, N2).
Buildroot Other Platform Configs buildroot-external/configs/green_defconfig, buildroot-external/configs/khadas_vim3_defconfig, buildroot-external/configs/ova_defconfig	Updated BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE from 6.18.24 to 6.18.26 for Home Assistant Green, Khadas VIM3, and Open Virtual Appliance platforms.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A kernel bump, from point two-four, to point two-six today,
Consistent updates across the board, no breaking change in play,
Nine platforms unified, one version strong and true,
Documentation dancing in sync—a rabbit's work shines through! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Linux: Update kernel to 6.18.26' directly and clearly summarizes the main change—updating the Linux kernel version across multiple board configurations from 6.18.24 to 6.18.26.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-linux-6.18.26

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Review rate limit: 7/8 reviews remaining, refill in 7 minutes and 30 seconds.}

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@buildroot-external/configs/generic_aarch64_defconfig`:
- Line 21: The kernel version string is incorrect: update the
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE setting from "6.18.26" to the released
"6.18.25" so the build uses the actual LTS kernel; locate the
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE line in the config and replace the value
accordingly.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: fa8fac75-25d2-4004-9e81-957754023c72

📥 Commits

Reviewing files that changed from the base of the PR and between 01f1f8a and 73422bb.

📒 Files selected for processing (11)

• Documentation/kernel.md
• buildroot-external/configs/generic_aarch64_defconfig
• buildroot-external/configs/generic_x86_64_defconfig
• buildroot-external/configs/green_defconfig
• buildroot-external/configs/khadas_vim3_defconfig
• buildroot-external/configs/odroid_c2_defconfig
• buildroot-external/configs/odroid_c4_defconfig
• buildroot-external/configs/odroid_m1_defconfig
• buildroot-external/configs/odroid_m1s_defconfig
• buildroot-external/configs/odroid_n2_defconfig
• buildroot-external/configs/ova_defconfig

[coderabbitai]

⚠️ Potential issue | 🔴 Critical

🧩 Analysis chain

🌐 Web query:

Does Linux kernel version 6.18.26 exist and are there any security advisories for it?

💡 Result:

No, Linux kernel version 6.18.26 does not exist. The latest stable release for the 6.18 series (LTS) as of 2026-04-30 is 6.18.25, released on 2026-04-27. kernel.org lists up to ChangeLog-6.18.24 in the directory index, with announcements for 6.18.18, 6.18.20, 6.18.25, but no mention of 6.18.26 in changelogs, LWN announcements, git tags, or searches. No security advisories exist for it, as it has not been released.

Citations:

• 1: https://www.kernel.org/pub/linux/kernel/v6.x/
• 2: https://www.kernel.org/
• 3: https://lwn.net/Articles/1069969/
• 4: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.24
• 5: https://lwn.net/Articles/1062865/
• 6: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.17
• 7: https://git.sceen.net/linux/linux-stable.git/tag/?h=v6.18.6
• 8: https://git.sceen.net/linux/linux-stable.git/tag/?h=v6.18.25

---

Update kernel version to 6.18.25 — 6.18.26 does not exist.

Linux kernel version 6.18.26 has not been released. The latest stable release in the 6.18 series (LTS) is 6.18.25, released on April 27, 2026. Update BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE to "6.18.25".

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@buildroot-external/configs/generic_aarch64_defconfig` at line 21, The kernel
version string is incorrect: update the BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE
setting from "6.18.26" to the released "6.18.25" so the build uses the actual
LTS kernel; locate the BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE line in the config
and replace the value accordingly.