CVE-2025-39841: In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix buffer free/clear order i

Q: How do I fix CVE-2025-39841?

linux kernel: upgrade to 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2025-39841 being exploited?

CVE-2025-39841 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-2025-39841 affect?

CVE-2025-39841 affects linux kernel, debian linux. Severity is critical (CVSS 9.8). In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix buffer free/clear order in deferred receive path Fix a use-after-free window by correcting the buffer release sequence in the deferred receive path. The c

Q: How urgent is CVE-2025-39841?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This month

CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2025-39841 is a critical-severity flaw (CVSS 9.8) affecting linux kernel, debian linux. 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: scsi: lpfc: Fix buffer free/clear order in deferred receive path Fix a use-after-free window by correcting the buffer release sequence in the deferred receive path. The code freed the RQ buffer first and only then cleared the context pointer under the lock. Concurrent paths (e.g., ABTS and the repost path) also inspect and release the same pointer under the lock, so the old ord

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-787
Published	2025-09-19
Last modified	2026-10-19

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

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-19 16:15 UTCPublished CVE record published
2026-10-19 21:10 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 5.1 and < 5.4.299 · >= 5.5 and < 5.10.243 · >= 5.11 and < 5.15.192 · >= 5.16 and < 6.1.151 · >= 6.2 and < 6.6.105 · >= 6.7 and < 6.12.46 · >= 6.13 and < 6.16.6 · 6.17 rc1

Fixed in: 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6

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.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · pipx · FIXED · 1.18.9-1.fc46 · FEDORA-2026-95305954ab · source

sudo dnf upgrade --advisory=FEDORA-2026-95305954ab

Fedora ELN · libisds · FIXED · 0.11.2-19.eln159 · FEDORA-2026-bf61b68668 · source

sudo dnf upgrade --advisory=FEDORA-2026-bf61b68668

Debian 12 · linux · FIXED · 6.1.153-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.153-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · linux · FIXED · 6.12.48-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.48-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · kernel · FIXED · kernel-6.12.0-55.40.1.el10_0

sudo dnf upgrade --advisory=RHSA-2025:18318 rpm -q kernel

RHEL 8 · kernel-rt · FIXED · kernel-rt-4.18.0-553.81.1.rt7.422.el8_10

sudo dnf upgrade --advisory=RHSA-2025:19103 rpm -q kernel-rt

RHEL 8 · kernel · FIXED · kernel-4.18.0-553.81.1.el8_10

sudo dnf upgrade --advisory=RHSA-2025:19102 rpm -q kernel

RHEL 8.2 Advanced Update Support · kernel · FIXED · kernel-4.18.0-193.178.1.el8_2

sudo dnf upgrade --advisory=RHSA-2025:23445 rpm -q kernel

RHEL 8.4 Advanced Mission Critical Update Support · kernel · FIXED · kernel-4.18.0-305.182.1.el8_4

sudo dnf upgrade --advisory=RHSA-2025:23463 rpm -q kernel

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-2025-39841?

linux kernel: upgrade to 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-39841 being exploited?

CVE-2025-39841 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-2025-39841 affect?

CVE-2025-39841 affects linux kernel, debian linux. Severity is critical (CVSS 9.8). In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix buffer free/clear order in deferred receive path Fix a use-after-free window by correcting the buffer release sequence in the deferred receive path. The c

How urgent is CVE-2025-39841?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Linux kernel vulnerabilities · Debian vulnerabilities

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References

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