CVE-2025-68295

Service interruption via unreleased CIFS domain allocation

Published Dec 16, 2025 · Updated Dec 16, 2025

Memory leak in the Linux CIFS client in affected kernel branches allows local users to deplete kernel memory through credentialed SMB access. In cifs_construct_tcon(), cifs_set_cifscreds() duplicates the supplied domain into ctx->domainname, but the function exits without freeing that allocation. Reachability requires a multiuser CIFS mount with domain= configured, a cifscreds entry, and filesystem metadata access; repeated leaks can interrupt service by exhausting memory.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux CIFS client in affected kernel branches allows local users to deplete kernel memory through credentialed SMB access. In cifs_construct_tcon(), cifs_set_cifscreds() duplicates the supplied domain into ctx->domainname, but the function exits without freeing that allocation. Reachability requires a multiuser CIFS mount with domain= configured, a cifscreds entry, and filesystem metadata access; repeated leaks can interrupt service by exhausting memory.

The record

CVE
CVE-2025-68295
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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=1456d3cea31114137fabf1110d20a2e2c6d6060f
  2. Affected versionversion=16764d7486d02b1699ae16e91d7a577602398b17
  3. Affected versionversion=325fa2a6729b74b2806b31725940cb54658515e5
  4. Affected versionversion=5.3
  5. Affected versionversion=8db988a982908b7bff76e095000adabf9c29698b
  6. Affected versionversion=904847402bd74a28164bd4d8da082d1eace7c190
  7. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <3184b6a5a24ec9ee74087b2a550476f386df7dc2
  8. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <3dd546e867e94c2f954bca45a961b6104ba708b6
  9. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <a67e91d5f446e455dd9201cdd6e865f7078d251d
  10. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <d146e96fef876492979658dce644305de35878d4
  11. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <f15288c137d960836277d0e3ecc62de68e52f00f
  12. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <f62ffdfb431bdfa4b6d24233b7fd830eca0b801e
  13. Affected versionversion=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <ff8f9bd1c46ee02d5558293915d42e82646d5ee9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1456d3cea31114137fabf1110d20a2e2c6d6060f; version=16764d7486d02b1699ae16e91d7a577602398b17; version=325fa2a6729b74b2806b31725940cb54658515e5; version=5.3; version=8db988a982908b7bff76e095000adabf9c29698b; version=904847402bd74a28164bd4d8da082d1eace7c190; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <3184b6a5a24ec9ee74087b2a550476f386df7dc2; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <3dd546e867e94c2f954bca45a961b6104ba708b6; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <a67e91d5f446e455dd9201cdd6e865f7078d251d; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <d146e96fef876492979658dce644305de35878d4; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <f15288c137d960836277d0e3ecc62de68e52f00f; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <f62ffdfb431bdfa4b6d24233b7fd830eca0b801e; version=f2aee329a68f5a907bcff11a109dfe17c0b41aeb <ff8f9bd1c46ee02d5558293915d42e82646d5ee9

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS: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

T1499.004Application or System Exploitation

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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