01 Record

CVE-2026-31657

batman-adv: hold claim backbone gateways by reference

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

batman-adv: hold claim backbone gateways by reference

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 33.8% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-24 14:45Z6 MO AGO

Last updated

2026-10-19 18:56Z10 DAYS AGO

Reserved

2026-03-09

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416Use After FreeVariant
CWE-476NULL Pointer DereferenceBase
CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

c9c15816b39ec8be4871d49fc93d2df155c4e357b800b9fd32a60939c59ec505

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux23721387c409087fd3b97e274f34d3ddc0970b74 to < 5202f071b367ffbc8e279fc7a00db14f5e587f52, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 69d1ce9c72eca91203ffdb8d08bacd511100aec6, 23721387c409087fd3b97e274f34d3ddc0970b74 to < f4858832ddef2f39f21e30b7226bbcd3c4b2bc96, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 2f55b58b5a0bbed192d60c444a45a49cdf1b545f, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 7962b522222628596ca9ecc8722efc95367aadbd, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 4dee4c0688443aaf5bbec74aa203c851d1d53c35, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 1f2dc36c297d27733f1b380ea644cf15a361bd7b, 23721387c409087fd3b97e274f34d3ddc0970b74 to < 82d8701b2c930d0e96b0dbc9115a218d791cb0d2, 3.5—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
git.kernel.orghttps://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
git.kernel.orghttps://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
git.kernel.orghttps://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
git.kernel.orghttps://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
git.kernel.orghttps://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
git.kernel.orghttps://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
git.kernel.orghttps://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2

07 Fixed in

Debian 12

linux
Fixed in 6.1.170-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.85-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.19.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.