01 Record

CVE-2026-64047

net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring

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

View raw JSON

02 Description

net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring

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

0.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 43.5% 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

2026-07-19 15:39Z3 MO AGO

Last updated

2026-10-19 20:28Z9 DAYS AGO

Reserved

2026-07-19

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-191Integer Underflow (Wrap or Wraparound)Base
CWE-193Off-by-one ErrorBase

Data version

5.2

Document digest

239ccd727454a64ed3a997e4a3f896b2a55ac5dd5f894e8dab808448eb7493e6

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 73963a375885d5ccb7def39fd0b4f542e0f343dd, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 47110c3a9ac247b688657337f5981efcfcb240dc, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 84158c2997159df4a0d70cd9c46774512d32a522, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 131ef12057d92b77b636321b7849c69222405a97, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 66339b71f105e6f83e0da3b9583d95077534fe1d, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < eca989eab4b2599dcb02f72140a7c08f08838520, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 2fb0dc7e0099686c4e9d2732745d8a31b18c3628, 9aaaa56845a06aeabdd597cbe19492dc01f281ec to < 285943c6e7ca309bbea84b253745154241d9788a, d529d6c9f7e3aaeac13c4948f79799ccb825f29d, 5.4.14 to < 5.5, 5.5—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd
git.kernel.orghttps://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc
git.kernel.orghttps://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522
git.kernel.orghttps://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97
git.kernel.orghttps://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d
git.kernel.orghttps://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520
git.kernel.orghttps://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628
git.kernel.orghttps://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a

07 Fixed in

Debian 12

linux
Fixed in 6.1.176-1

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

Debian 13

linux
Fixed in 6.12.94-1

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

Debian 14

linux
Fixed in 7.0.12-1

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