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Vulnerabilities

Vulnerability · CVE-2026-99030

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadabl

Published Oct 23, 2026 · catalog updated Oct 25, 2026 · In the Linux kernel,

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-99030. EPSS is 0.46%. Act only if a listed version of In the Linux kernel, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In the Linux kernel,).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Advisory link
Affected products
Debian:13 linux · Debian:14 linux

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending packet, or a driver's TX bounce buffer in skb_copy_and_csum_dev(). Neither buffer is zeroed beforehand, so whatever was in memory there gets sent. Zero the part of the buffer we didn't fill. The checksum usually won't match the data any more, so the receiver will usually drop the packet, but either way it no longer carries anything it shouldn't. Only zero for a positive @len, a negative one from a broken caller must not turn into a huge memset().

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.

  • Debian:13 linux0 → 6.12.113-1
  • Debian:14 linux0 → 7.2.11-1

How to fix CVE-2026-99030

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-2026-99030. EPSS is 0.46%. Act only if a listed version of In the Linux kernel, is installed.

Which versions are affected?

Compare what you have installed with 0 → 6.12.113-1, 0 → 7.2.11-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

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

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · Tenable CVE Database

    Detected

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending pack

  2. Oct 25, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    linux fixed in 6.12.113-1; linux fixed in 7.2.11-1

  3. Oct 25, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    linux fixed in 6.12.113-1

  4. Oct 25, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    linux fixed in 7.2.11-1

  5. Oct 25, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending pack

Sources

  • CVE.orgVulnerability recordCVE-2026-99030

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-99030

    30-day exploitation probability 0.46%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-99030
    osv.dev
  • Tenable CVE DatabaseVulnerability recordCVE-2026-99030

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending pack

    tenable.com
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-99030

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • Trivy Vulnerability DBOct 25, 2026
  • OpenSSF OSV / OSV ScannerOct 25, 2026
  • Tenable CVE DatabaseOct 25, 2026
  • CVE.orgOct 23, 2026