CVE-2022-49708

Local system crash via truncated ext4 allocation

Published Feb 26, 2025 · Updated May 23, 2026

Reachable assertion in the Linux kernel ext4 allocator allows local users to crash the system through crafted filesystem activity. After request-size truncation, ext4_mb_normalize_request calculates the wrong block-group start, allowing ext4_mb_use_inode_pa to produce a nonpositive extent length that reaches BUG_ON in ext4_mb_mark_diskspace_used. The path requires local activity on a mounted ext4 filesystem with a small block-group size and interrupts the entire system when the kernel assertion fires.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel ext4 allocator allows local users to crash the system through crafted filesystem activity. After request-size truncation, ext4_mb_normalize_request calculates the wrong block-group start, allowing ext4_mb_use_inode_pa to produce a nonpositive extent length that reaches BUG_ON in ext4_mb_mark_diskspace_used. The path requires local activity on a mounted ext4 filesystem with a small block-group size and interrupts the entire system when the kernel assertion fires.

The record

CVE
CVE-2022-49708
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.10.107 <3.11
  2. Affected versionversion=3.12.72 <3.13
  3. Affected versionversion=3.16.44 <3.17
  4. Affected versionversion=3.2.89 <3.3
  5. Affected versionversion=37cf4ab1ba60c30ca9fd0fe3b9993b24cb87886a
  6. Affected versionversion=4.10.2 <4.11
  7. Affected versionversion=4.11
  8. Affected versionversion=4.1.40 <4.2
  9. Affected versionversion=4.4.53 <4.5
  10. Affected versionversion=4.9.14 <4.9.320
  11. Affected versionversion=75f37dab088eb84ff25a49e59371f01ea3f44aa7
  12. Affected versionversion=8774c73cf6963310395823ed7077ea12943ea0f3
  13. Affected versionversion=98f58e05231f835dfb09359e3b5e3a886fe8f189
  14. Affected versionversion=c1664e9bcf6291c0ceb8599f57c8cf493526abe6
  15. Affected versionversion=c4fbdc0124799f1772f4d886b7f2e1a6f881d195
  16. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <5707d721d1819db57dba57b1d4623034fcb32047
  17. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f
  18. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <887a3e9ad4b8309a2266bce7ae749b2bf1f7a687
  19. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <90f0f9d45dff0128c0fca0d2358c4153b024afa6
  20. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a08f789d2ab5242c07e716baf9a835725046be89
  21. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a37c1359714da42517dd19d36fc3c4d17edba832
  22. Affected versionversion=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a6b31616e5afe1d3972cb0682a373e50597faf5c
  23. Affected versionversion=f213db429b883a2d5403de0b1ce92fb7d7ee979e
  24. Affected versionversion=fc6c2da174edd7a7b760b12c60d432d300e05cca <6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10.107 <3.11; version=3.12.72 <3.13; version=3.16.44 <3.17; version=3.2.89 <3.3; version=37cf4ab1ba60c30ca9fd0fe3b9993b24cb87886a; version=4.10.2 <4.11; version=4.11; version=4.1.40 <4.2; version=4.4.53 <4.5; version=4.9.14 <4.9.320; version=75f37dab088eb84ff25a49e59371f01ea3f44aa7; version=8774c73cf6963310395823ed7077ea12943ea0f3; version=98f58e05231f835dfb09359e3b5e3a886fe8f189; version=c1664e9bcf6291c0ceb8599f57c8cf493526abe6; version=c4fbdc0124799f1772f4d886b7f2e1a6f881d195; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <5707d721d1819db57dba57b1d4623034fcb32047; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <6fdaf31ad5f3d3afab744dfd9a8b0d9142aa881f; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <887a3e9ad4b8309a2266bce7ae749b2bf1f7a687; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <90f0f9d45dff0128c0fca0d2358c4153b024afa6; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a08f789d2ab5242c07e716baf9a835725046be89; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a37c1359714da42517dd19d36fc3c4d17edba832; version=cd648b8a8fd5071d232242d5ee7ee3c0815776af <a6b31616e5afe1d3972cb0682a373e50597faf5c; version=f213db429b883a2d5403de0b1ce92fb7d7ee979e; version=fc6c2da174edd7a7b760b12c60d432d300e05cca <6880fb2e64331b9fdc85d3f32b1d7e81ad8703f1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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