CVE-2026-23352: In the Linux kernel, the following vulnerability has been resolved: x86/efi: defer freeing of boot services m

Q: How do I fix CVE-2026-23352?

linux kernel: upgrade to 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-23352 being exploited?

CVE-2026-23352 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23352 affect?

CVE-2026-23352 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: x86/efi: defer freeing of boot services memory efi_free_boot_services() frees memory occupied by EFI_BOOT_SERVICES_CODE and EFI_BOOT_SERVICES_DATA using memblock_free_lat

Q: How urgent is CVE-2026-23352?

Priority 25/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-23352 is a medium-severity flaw (CVSS 5.5) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: x86/efi: defer freeing of boot services memory efi_free_boot_services() frees memory occupied by EFI_BOOT_SERVICES_CODE and EFI_BOOT_SERVICES_DATA using memblock_free_late(). There are two issue with that: memblock_free_late() should be used for memory allocated with memblock_alloc() while the memory reserved with memblock_reserve() should be freed with free_reserved_area().

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-401
Published	2026-03-25
Last modified	2026-10-15

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-25 11:16 UTCPublished CVE record published
2026-10-15 02:18 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 3.0.1 and < 5.10.253 · >= 5.11 and < 5.15.203 · >= 5.16 and < 6.1.167 · >= 6.2 and < 6.6.130 · >= 6.7 and < 6.12.77 · >= 6.13 and < 6.18.17 · >= 6.19 and < 6.19.7 · 2.6.39.1

Fixed in: 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23352?

linux kernel: upgrade to 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7. Exact commands for each OS are on this page.

Is CVE-2026-23352 being exploited?

CVE-2026-23352 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23352 affect?

CVE-2026-23352 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: x86/efi: defer freeing of boot services memory efi_free_boot_services() frees memory occupied by EFI_BOOT_SERVICES_CODE and EFI_BOOT_SERVICES_DATA using memblock_free_lat

How urgent is CVE-2026-23352?

Priority 25/100. On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

CVE-2026-98114 MEDIUM 5.5 UPGRADE In the Linux kernel, the following vulnerability has been resolved: ksmbd: propagate DACL parsing errors par
CVE-2026-98116 HIGH 7.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Serialize PCM mmap with buffer
CVE-2026-98117 HIGH 7.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix potential UAF/KASAN warni
CVE-2026-98118 HIGH 7.1 UPGRADE In the Linux kernel, the following vulnerability has been resolved: netfs: Fix readahead synchronisation issu
CVE-2026-63947 HIGH 8.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: fix missing length check

References

← Back to latest CVEs