Update Microsoft.WSL.Kernel to 6.18.26.1 by chessturo · Pull Request #40161 · microsoft/WSL

chessturo · 2026-04-10T22:05:56Z

Updated Microsoft.WSL.Kernel package version from 6.6.114.1-1 to 6.18.20.3-1.

Release rolling-lts/wsl/6.18.20.3
Update to stable kernel version v6.18.20
New x86 and ARM64 configs including:
- CONFIG_ANON_VMA_NAME
- Various options for CAN support
- CONFIG_INPUT_JOYDEV
- CONFIG_USB_MON
- F2FS support
- ExFAT support
Configs added to ARM64 already present on x86
- FAT support
Fewer out of tree patches. Sets of patches now included from upstream:
- Virtio PMEM support for PCI BAR addresses (feature/hvlite_virtio_pmem/6.6)
- ICTIMESYNCFLAG_SYNC support (fix/hv_utils_clock/6.6)

Closes: #7747, #11994, #11503, #8231, #11801, #11285

Copilot

Pull request overview

Updates the WSL kernel NuGet dependency to ship a newer rolling-lts kernel release, aligning the repo’s build inputs with kernel v6.18.20 and the associated configuration/patch set described in the PR metadata.

Changes:

Bump Microsoft.WSL.Kernel package version from 6.6.114.1-1 to 6.18.20.1-1.

OneBlue · 2026-04-11T00:58:18Z

Updated this branch since the build break in master has been resolved

benhillis · 2026-04-11T21:23:39Z

Strange, a bunch of errors around importing distributions. I'll try to get a local repro.

Copilot

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

Copilot

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Copilot

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Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

benhillis

This is looking good, but let's hold off on merging 6.18 until we promote the current 2.7.X WSL package to GA.

Copilot

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

cscnk52 · 2026-05-01T03:37:50Z

Sorry to bother you, but I suggest updating the version to 6.18.22 or later to avoid the copy fail (CVE-2026-31431) affecting newer kernels.

Copilot

Pull request overview

Copilot reviewed 18 out of 26 changed files in this pull request and generated 4 comments.

Copilot · 2026-05-01T15:30:22Z

  </data>
  <data name="MessageWslcNoSessionsFound" xml:space="preserve">
-    <value>No WSLC sessions found.</value>
+    <value>WSLA-istuntoja ei löytynyt.</value>


This string uses "WSLA" (likely a typo) while other related strings and the product name use "WSLC". Please correct this to "WSLC" to avoid confusing users (and keep the acronym consistent across locales).

Suggested change

<value>WSLA-istuntoja ei löytynyt.</value>

<value>WSLC-istuntoja ei löytynyt.</value>

Copilot · 2026-05-01T15:30:22Z

  </data>
  <data name="MessageWslcInvalidImage" xml:space="preserve">
-    <value>Invalid image: '{}'</value>
+    <value>Ogiltig bild ''{}''</value>


The value wraps the placeholder with doubled single quotes (''{}''), which will likely render with two quote characters in UI. If the intent is to quote the inserted value, this should typically be a single pair of quotes around the placeholder (matching en-US: "Invalid image: '{}'"), or no quotes at all.

Suggested change

<value>Ogiltig bild ''{}''</value>

<value>Ogiltig bild '{}'</value>

Copilot · 2026-05-01T15:30:22Z

  </data>
  <data name="MessagePathNotAbsolute" xml:space="preserve">
-    <value>Path is not absolute: '{}'</value>
+    <value>Sökvägen är inte absolut: ''{}''</value>


This value also uses doubled single quotes (''{}''), which will likely render as double quotes in UI. Consider using a single quoted placeholder (e.g., "'{}'") or matching the en-US punctuation pattern for consistency.

Suggested change

<value>Sökvägen är inte absolut: ''{}''</value>

<value>Sökvägen är inte absolut: '{}'</value>

Adjust eventfd size validation, lxtfs writev, and mount option format expectations to match 6.18 kernel behavior. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The kernel now outputs cache=0x5 (hex) instead of cache=5 (decimal) in /proc/mounts for 9p filesystems. Update the ExpectMount patterns in WSLCTests::WindowsMounts and WSLCTests::GPU to match the new format. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

janderssonse · 2026-05-08T10:20:27Z

Sorry to bother you, but I suggest updating the version to 6.18.22 or later to avoid the copy fail (CVE-2026-31431) affecting newer kernels.

I think a lot of MS enterprise users would expect an new sharp release (2.7.4? - not a pre-release - containing that fix.

benhillis · 2026-05-11T18:05:28Z

Sorry to bother you, but I suggest updating the version to 6.18.22 or later to avoid the copy fail (CVE-2026-31431) affecting newer kernels.

Sorry to bother you, but I suggest updating the version to 6.18.22 or later to avoid the copy fail (CVE-2026-31431) affecting newer kernels.

I think a lot of MS enterprise users would expect an new sharp release (2.7.4? - not a pre-release - containing that fix.

Yes we will be rolling out a version with the new 6.18 kernel (which includes the copy-fail CVE fix) soon.

chessturo requested a review from a team as a code owner April 10, 2026 22:05

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Comment thread test/windows/UnitTests.cpp

Comment thread test/linux/unit_tests/lxtfs.c

Comment thread test/linux/unit_tests/lxtfs.c

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from 2a21f7b to 80c362e Compare April 20, 2026 23:46

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Comment thread packages.config Outdated

Comment thread test/linux/unit_tests/lxtfs.c Outdated

github-code-quality Bot found potential problems Apr 21, 2026

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Comment thread src/windows/wslsettings/Views/Settings/SettingsApplyHelper.cs Fixed

benhillis changed the title ~~Update Microsoft.WSL.Kernel to 6.18.20.1~~ Apr 21, 2026

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from 3d2c733 to c304a6e Compare April 21, 2026 20:20

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from f785e6e to 3be1194 Compare April 23, 2026 16:22

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from 3be1194 to 6108599 Compare April 23, 2026 18:27

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chessturo force-pushed the user/chessturo/6.18.20.1-update branch from 6108599 to c26f8dd Compare April 29, 2026 23:26

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from c26f8dd to a0228f8 Compare May 1, 2026 03:15

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benhillis force-pushed the user/chessturo/6.18.20.1-update branch from 5728d8d to cf7307e Compare May 1, 2026 16:25

chessturo and others added 3 commits May 7, 2026 15:17

Update Microsoft.WSL.Kernel to 6.18.26.1-1

7c45f10

Update tests for Linux 6.18 kernel behavior changes

c0d595a

Adjust eventfd size validation, lxtfs writev, and mount option format expectations to match 6.18 kernel behavior. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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chessturo force-pushed the user/chessturo/6.18.20.1-update branch from cf7307e to 2c0521d Compare May 7, 2026 22:17

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Merge branch 'master' into user/chessturo/6.18.20.1-update

6f28b44

benhillis changed the title ~~Update Microsoft.WSL.Kernel to 6.18.20.3~~ May 8, 2026

benhillis approved these changes May 8, 2026

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benhillis merged commit 4b41584 into master May 8, 2026
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benhillis deleted the user/chessturo/6.18.20.1-update branch May 8, 2026 17:45

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Update Microsoft.WSL.Kernel to 6.18.26.1#40161

Update Microsoft.WSL.Kernel to 6.18.26.1#40161
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chessturo commented Apr 10, 2026 •

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	<value>WSLA-istuntoja ei löytynyt.</value>
	<value>WSLC-istuntoja ei löytynyt.</value>

	<value>Ogiltig bild ''{}''</value>
	<value>Ogiltig bild '{}'</value>

	<value>Sökvägen är inte absolut: ''{}''</value>
	<value>Sökvägen är inte absolut: '{}'</value>

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