9.8

CVE-2026-64089: linux

CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-64089DEBIAN-CVE-2026-64089
Published 19-07-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-64089 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 44.9% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.55%
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 43 · Related 43
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23241-1SUSE-SU-2026:23244-1SUSE-SU-2026:23881-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer. In batadv_send_my_tt_response(), last_changeset_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized. Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_my_tt_response().

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

0.00 pp

From 0.55% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.55%

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

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < 6314089acf0ddf64376fdc0b1420695504c73f52 | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < 55dc41fe8821e9a849e147255ad572bc933a9d15 | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < c424e8519ac78eac5d9f4eecf06208a0d619ec14 | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < 22d59c72f4a47ffec121d0610f70d0d70c3c11c8 | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < eb235472b52ef36981c5aad330485eaf2382c53b | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < 179eb62506a02d00370bd6478898cb632e10986c | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < d29abf70c665730e249d2ec8e1402095ae26bcee | ≥ a73105b8d4c765d9ebfb664d0a66802127d8e4c7, < fc92cdfcb295cefa4344d71a527d61b638b7bfc4 | 3.1
  • linux_kernel≥ 3.1, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 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

3 vendors · 170 products

References

44 links
Show all 44 references