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CVE detail

CVE-2026-43284

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().

CVSS 8.8 · HighBuzz score 65.33 public exploit repository references

Buzz score

Why this CVE is surfacing

Buzz score total 65.3

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 30.0 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 15.3
Mention score
30.0
77 evidence mentions in the snapshot
Diversity score
20.0
15 sources across 6 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
15.3
3 repos · best confidence 0.99
Best PoC traction
2
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
2
within the 30d window
Peak daily
1
highest bucket

Evidence

Source links by recency

Newest mentions first
77 source links · newest first

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

3 repository references · best confidence 0.99 · max 2 stars
  • krisiasty/vcheckMedium confidence
    githubRepository topic discovery2 starsDiscovered Jul 13, 2026, 10:51 AM
  • AK777177/Dirty-Frag-AnalysisHigh confidence
    githubDiscovery source unavailable2 starsDiscovered Jul 9, 2026, 1:19 AM
  • V4bel/dirtyfragHigh confidence
    githubNVD Exploit reference0 starsDiscovered Jul 14, 2026, 12:21 PM

    NVD labels the source link as Exploit; this is not independent verification of the repository's code.

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