CVE-2025-21736: nilfs2: fix possible int overflows in nilfs_fiemap()

Q: What is the severity of CVE-2025-21736?

CVE-2025-21736 is classified as a medium severity vulnerability.

Q: How do I fix CVE-2025-21736?

To fix CVE-2025-21736, update your Linux kernel to the latest version where this vulnerability has been resolved.

Q: What impact does CVE-2025-21736 have on affected systems?

CVE-2025-21736 may lead to potential integer overflows that could affect system stability and security.

Q: Which versions of the Linux kernel are affected by CVE-2025-21736?

CVE-2025-21736 affects specific versions of the Linux kernel, particularly those that implement nilfs2 file system operations.

Q: Is CVE-2025-21736 exploitable remotely?

CVE-2025-21736 is not typically considered a remotely exploitable vulnerability, requiring local access to the affected system.

Published Feb 27, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix possible int overflows in nilfsfiemap()

Since nilfsbmaplookupcontig() in nilfsfiemap() calculates its result by being prepared to go through potentially maxblocks == INTMAX blocks, the value in n may experience an overflow caused by left shift of blkbits.

While it is extremely unlikely to occur, play it safe and cast right hand expression to wider type to mitigate the issue.

Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.

Affected Software

218 affected componentsFixes available

Linux Kernel

Linux Linux kernel>=2.6.38<6.1.129

Linux Linux kernel>=6.2<6.6.78

Linux Linux kernel>=6.7<6.12.14

Linux Linux kernel>=6.13<6.13.3

Microsoft cbl2 kernel 5.15.182.1-1

Patch available

Microsoft azl3 kernel 6.6.78.1-3

Patch available

Microsoft cbl2 kernel 5.15.179.1-1

Patch available

Microsoft azl3 kernel 6.6.64.2-9

Patch available

Microsoft cbl2 kernel 5.15.182.1-1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

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ubuntu/linux-aws-5.0*

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ubuntu/linux-gcp-fips<5.4.0-1149.158+fips1

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ubuntu/linux-aws-fips*

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ubuntu/linux-aws-5.19*

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ubuntu/linux-azure<5.15.0-1089.98

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ubuntu/linux-gkeop<5.15.0-1066.74

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ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-64.67~22.04.1

6.8.0-64.67~22.04.1

ubuntu/linux-ibm<5.15.0-1076.79

5.15.0-1076.79

ubuntu/linux-ibm-6.8<6.8.0-1029.29~22.04.1

6.8.0-1029.29~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1079.85

5.15.0-1079.85

ubuntu/linux-kvm<5.15.0-1080.85

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5.15.0-1078.81

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

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6.8.0-64.67~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

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ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1084.91+fips1

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ubuntu/linux-azure-fips<5.15.0-1089.98+fips1

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ubuntu/linux-fips<5.15.0-140.150+fips1

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5.15.0-1083.92+fips1

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6.8.0-1032.34

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6.11.0-1015.15~24.04.1

ubuntu/linux-gke<6.8.0-1028.32

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ubuntu/linux-gkeop<6.8.0-1015.17

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ubuntu/linux-ibm<6.8.0-1029.29

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6.8.0-1031.34.1

ubuntu/linux-nvidia-tegra<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-oem-6.11<6.11.0-1022.22

6.11.0-1022.22

ubuntu/linux-oem-6.8<6.8.0-1031.31

6.8.0-1031.31

ubuntu/linux-oracle<6.8.0-1029.30

6.8.0-1029.30

ubuntu/linux-raspi<6.8.0-1031.35

6.8.0-1031.35

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-xilinx<6.8.0-1017.18

6.8.0-1017.18

ubuntu/linux-raspi-realtime<6.8.0-2026.27

6.8.0-2026.27

ubuntu/linux-realtime<6.8.1-1025.26

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ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1146.156~18.04.1
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Fixed in 5.4.0-1151.158~18.04.1
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Fixed in 5.4.0-1149.158~18.04.1
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Fixed in 5.4.0-216.236~18.04.1
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Fixed in 5.4.0-1092.97~18.04.1
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Fixed in 5.4.0-1144.154~18.04.1
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Fixed in 5.4.0-1129.142~18.04.1
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Fixed in 5.4.0-216.236
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Fixed in 5.4.0-1146.156
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Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1084.91~20.04.1
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Fixed in 5.4.0-1151.158
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Fixed in 5.15.0-1089.98~20.04.1
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Fixed in 5.4.0-1105.112
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Fixed in 5.4.0-1149.158
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Fixed in 5.15.0-1083.92~20.04.1
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Fixed in 5.4.0-1092.97
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Fixed in 5.15.0-1076.79~20.04.1
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Fixed in 5.15.0-1079.85~20.04.1
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Fixed in 5.4.0-1133.142
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Fixed in 5.15.0-140.150~20.04.1
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Fixed in 5.4.0-1144.154
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Fixed in 5.15.0-1081.87~20.04.1
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Fixed in 5.4.0-1129.142
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Fixed in 5.15.0-1079.83~20.04.1
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Fixed in 5.4.0-1064.68
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Fixed in 5.15.0-142.152~20.04.1
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Fixed in 5.4.0-1051.54
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Fixed in 5.15.0-1039.39~20.04.1
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Fixed in 5.4.0-1146.156+fips1
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Fixed in 5.4.0-1151.158+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1120.130
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Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.158+fips1
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Fixed in 5.15.0-140.150
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Fixed in 5.15.0-1084.91
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Fixed in 6.8.0-1032.34~22.04.1
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Fixed in 5.15.0-1089.98
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Fixed in 6.8.0-1034.39~22.04.1
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Fixed in 5.15.0-1089.98.1
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Fixed in 5.15.0-1083.92
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Fixed in 6.8.0-1033.35~22.04.1
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Fixed in 5.15.0-1081.87
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Fixed in 5.15.0-1066.74
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Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-64.67~22.04.1
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Fixed in 5.15.0-1076.79
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Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1029.29~22.04.1
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Fixed in 5.15.0-1079.85
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1080.85
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Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-140.150
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Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-64.67.1~22.04.1
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Fixed in 5.15.0-1078.79
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Fixed in 6.8.0-1031.34~22.04.1
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Fixed in 5.15.0-1037.37
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Fixed in 5.15.0-1026.26
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Fixed in 5.15.0-1081.87
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Fixed in 6.8.0-1029.30~22.04.1
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Fixed in 5.15.0-1078.81
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Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-64.67~22.04.1
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Fixed in 5.15.0-1050.54
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Fixed in 5.15.0-1066.68
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Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1077.79
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1084.93
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Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1025.26~22.04.1
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Fixed in 5.15.0-1084.91+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1089.98+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-140.150+fips1
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Fixed in 5.15.0-1083.92+fips1
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Fixed in 6.8.0-64.67
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Fixed in 6.8.0-1032.34
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Fixed in 6.8.0-1034.39
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Fixed in 6.11.0-1015.15~24.04.1
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Fixed in 6.8.0-1022.23
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Fixed in 6.8.0-1033.35
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Fixed in 6.11.0-1015.15~24.04.1
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Fixed in 6.8.0-1028.32
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Fixed in 6.8.0-1015.17
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Fixed in 6.11.0-26.26~24.04.1
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Fixed in 6.8.0-1029.29
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Fixed in 6.8.0-64.67.1
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Fixed in 6.11.0-1014.15~24.04.1
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Fixed in 6.8.0-1031.34
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Fixed in 6.11.0-1010.10
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Fixed in 6.8.0-1031.34.1
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Fixed in 6.8.0-1008.8
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Fixed in 6.11.0-1022.22
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Fixed in 6.8.0-1031.31
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Fixed in 6.8.0-1029.30
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Fixed in 6.8.0-1031.35
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Fixed in 6.8.0-1017.18
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Fixed in 6.8.0-2026.27
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Fixed in 6.8.1-1025.26
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Fixed in 6.8.0-78.78+fips1
Compensating control
In nilfs_fiemap(), cast the right-hand expression used for the block-count calculation in nilfs_bmap_lookup_contig() to a wider type to prevent integer overflow from left-shifting by blkbits.

Event History

Feb 27, 2025

CVE Published

via MITRE·02:12 AM

Data Sourced

via MITRE·02:12 AM

Description

Data Sourced

via OSV·03:15 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·03:15 AM

RemedyDescriptionSeverityWeaknessAffected Software

Mar 14, 2025

Data Sourced

via Microsoft·07:00 AM

DescriptionSeverityWeakness

Data Sourced

via Microsoft·07:00 AM

Affected Software

Frequently Asked Questions

What is the severity of CVE-2025-21736?

CVE-2025-21736 is classified as a medium severity vulnerability.

How do I fix CVE-2025-21736?

To fix CVE-2025-21736, update your Linux kernel to the latest version where this vulnerability has been resolved.

What impact does CVE-2025-21736 have on affected systems?

CVE-2025-21736 may lead to potential integer overflows that could affect system stability and security.

Which versions of the Linux kernel are affected by CVE-2025-21736?

CVE-2025-21736 affects specific versions of the Linux kernel, particularly those that implement nilfs2 file system operations.

Is CVE-2025-21736 exploitable remotely?

CVE-2025-21736 is not typically considered a remotely exploitable vulnerability, requiring local access to the affected system.

CVE-2025-21736: nilfs2: fix possible int overflows in nilfs_fiemap()

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2025-21736?

How do I fix CVE-2025-21736?

What impact does CVE-2025-21736 have on affected systems?

Which versions of the Linux kernel are affected by CVE-2025-21736?

Is CVE-2025-21736 exploitable remotely?

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