8.1

CVE-2026-98239: linux

CVSS: 8.1v3.1HighReceived
AliasesUBUNTU-CVE-2026-98239DEBIAN-CVE-2026-98239
Published 06-10-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-98239 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.8% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12131-1

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: lan743x: fix RX checksum use-after-free lan743x_rx_process_buffer() adds each non-first receive buffer to the head skb's frag_list. On the last descriptor, lan743x_rx_trim_skb() linearizes the head and frees the fragment skb metadata. The checksum-success path then writes ip_summed through the local skb pointer, which still points to the final fragment. This causes a use-after-free write when a packet spans more than one receive buffer. Set ip_summed on the surviving head skb instead. Multi-buffer receive can occur after a live MTU increase because existing ring entries keep their old buffer size until they are replenished. A KUnit test invoking lan743x_rx_process_buffer() with a two-buffer packet produced a one-byte KASAN use-after-free write before this change. The same test passed after the change. The driver object also builds with W=1. This was not tested on physical LAN743x hardware.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

06-10-202621-10-2026
EPSS score
0.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu142 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.113-1 | < 7.2.8-1
Linux1 product
  • linux≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < 0e52886c4324c9897c2c62f92be3dc8316cee67e | ≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < a58024835c704419bb46d2a34e5223f65605f958 | ≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < 6fe5c3a2503983abb431d93faeadfc7f5e6a7e33 | ≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < 5c216bfa9fb7b36804485e67975e9c98055b31ef | ≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < 161a403c8625e152de03d1da22bbf9cda6dc9f9f | ≥ cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a, < a9ce4053dc945c5372dedba5017ee675b30dc0c5 | 6.1

3 vendors · 144 products

References

10 links