CVE-2026-80793: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-80793DEBIAN-CVE-2026-80793
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80793 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.19%
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 12 · Related 11
MGASA-2026-0506OPENSUSE-SU-2026:11773-1OPENSUSE-SU-2026:22091-1SUSE-SU-2026:24179-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: reject undersized MTUs in ip_do_fragment() ip_do_fragment() subtracts the IPv4 header length from the effective MTU and passes the resulting payload MTU to ip_frag_next(). If the effective MTU is smaller than hlen + 8, ip_frag_next() rounds the fragment payload length down to zero. The fragmentation state then never makes forward progress: state->left, state->ptr and state->offset stay unchanged while ip_do_fragment() keeps allocating and transmitting header-only fragments until the softlockup detector fires. This is reproducible with a route installed using "mtu lock 20", but it is also reproducible without route MTU lock, for example by forwarding a packet to a device whose MTU is 20. Fix it in ip_do_fragment() by rejecting mtu < hlen + 8 with -EMSGSIZE, matching the existing IPv6 fragmentation check.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.19%

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
  • linux< 6.1.187-1 | < 6.12.107-1 | < 7.1.12-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a716a64a4ba68cd46f2745fba2b1099fe8e0aa59 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 515b6816ba0c12d8415c88e5f41e6ec029e35cfa | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 74ce7389f8f562d39015f59a00ef7ad6acd37803 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b0ea911453ce7210e8200a07a94d2458bd1e6430 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 36e0741833bd823866f8cb9f112f37cea1a70b60 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d9d1a676b033acabf8e5645f730486d1f8204a3f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3556beb8ca86677af2aca5bfbed6f8e790fccc83 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c8a74adccaf028223054633b532593101dfcc581 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c0726f0caf8c6b3208552949e17d23634a2f3129 | 2.6.12

3 vendors · 172 products

References

14 links
Show all 14 references