7.8

CVE-2026-46323: net: gro: don't merge zcopy skbs

Modified
AliasesRHSA-2026:44270UBUNTU-CVE-2026-46323DEBIAN-CVE-2026-46323
Published 09-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-46323 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · -0.07 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 134 · Related 126
OPENSUSE-SU-2026:11014-1OPENSUSE-SU-2026:21555-1RHSA-2026:27708RHSA-2026:27731RHSA-2026:27735RHSA-2026:36018

Showing 100 of 134.

Timeline

  1. 09-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.07 pp

From 0.20% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu132 products
  • linux< 6.8.0-124.124 | < 6.17.0-35.35 | < 7.0.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1057.60 | < 6.17.0-1017.17 | < 7.0.0-1006.6
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Redhat65 products
  • kernel< 0:6.12.0-211.38.1.el10_2
  • kernel-64k< 0:6.12.0-211.38.1.el10_2
  • kernel-64k-core< 0:6.12.0-211.38.1.el10_2
  • kernel-64k-debug< 0:6.12.0-211.38.1.el10_2
  • kernel-64k-debug-core< 0:6.12.0-211.38.1.el10_2
Linux2 products
  • linux≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d | ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 1f9c828556416fbe3f49386708ce999fc4d4da06 | ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 479084ae0e1d9cb7929cb4298d35623de189f80a | ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < e334cbf3388fd9334503a778a82d9e9f14dd2f71 | ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 44bea2032af0425e4ce6d26a8af0ede79db49ec1 | ≥ 753f1ca4e1e50248a1b760c9774d6d6b354562cc, < 4db79a322db8c97f7b73b8a347395ef4d685eb40 | 6.0
  • linux_kernel≥ 6.0, < 6.1.176 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1

4 vendors · 200 products · Showing 200 of 225

References

46 links
Show all 46 references