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Vulnerabilities

Vulnerability · CVE-2025-39847

In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without rel

Published Sep 19, 2025 · catalog updated May 12, 2026 · Linux Linux

Check if you run it

No confirmed exploitation is on record for CVE-2025-39847. EPSS is 0.16%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.16%
Remediation
Version ranges on file
Affected products
vendor Linux Linux b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c <9ca6a040f76c0b149293e430dabab446f3fc8ab7

In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kfree_skb(skb); When pad_compress_skb() returns NULL, the reference to the old skb is lost and kfree_skb(skb) ends up doing nothing, leading to a memory leak. Align pad_compress_skb() semantics with realloc(): only free the old skb if allocation and compression succeed. At the call site, use the new_skb variable so the o

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c <9ca6a040f76c0b149293e430dabab446f3fc8ab7b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c <9ca6a040f76c0b149293e430dabab446f3fc8ab7

How to fix CVE-2025-39847

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-39847. EPSS is 0.16%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c <9ca6a040f76c0b149293e430dabab446f3fc8ab7 b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c <9ca6a040f76c0b149293e430dabab446f3fc8ab7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 19, 2025 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kfree_skb(skb); When pad_compress_skb() returns NULL, the reference to the old skb is lost and kfree_skb(skb) ends up doin

  2. May 12, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kfree_skb(skb); When pad_compress_skb() returns NULL, the reference to the old skb is lost and kfree_skb(skb) ends up doin

Sources

  • CVE.orgVulnerability recordCVE-2025-39847

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-39847

    30-day exploitation probability 0.16%

    first.org
  • EUVDVulnerability recordEUVD-2025-30353

    In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kf

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.