7.8

CVE-2026-80977: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-80977DEBIAN-CVE-2026-80977
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80977 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
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-2026:11805-1

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't touch shared zerocopy state in skb_tx_error() skb_tx_error() completes the zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears SKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone shares, while the caller only owns the reference it is about to drop. Through a clone it tells the producer its pages are free and drops SKBFL_SHARED_FRAG for an skb that is still in flight. Open vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC: clone_execute() sends a skb_clone() into ovs_dp_process_packet() while do_execute_actions() keeps forwarding the original, and skb_clone() does not privatise the frags here -- skb_orphan_frags() returns early on SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker from the packet still being forwarded, and a later local ESP delivery decrypts in place over frags it does not own privately. Skip it for a cloned skb. Nothing is lost: skb_release_data() clears the zerocopy state once the last reference to the shared data goes.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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

Ubuntu169 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)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 6493165034bca14033bf49c9cec7b45e97a91497 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < b4452349dcf4d561e13be768d5d278de58248930 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 363c4252ffc473a0203e91b83ede5519dfb8bd07 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 6ec22afc82a3cae07ade0a6ec361ae2532128ff5 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 15aa81b390d401abf4b8211042470e9e92e3b7fb | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 288f9970670841044ab030104fa6b6ed159949d0 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 0370da114a9bc044e248b85c6809d1b5e0c1f7f9 | ≥ 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < f66bdb1cc0fcd227a062378f8be0b5873aa5600a | 3.8

3 vendors · 172 products

References

13 links
Show all 13 references