01 Record

CVE-2026-80603

netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read

CriticalPUBLISHEDCNA: Linux

CNA base score9.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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02 Description

netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read

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

0.59% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 48.2% of scored records. A rank, not a probability.

NVD base score

9.1 (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:N

NVD analysis status

Received. NVD last modified this record on 2026-10-16.

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

2026-08-28 06:48Z2 MO AGO

Last updated

2026-10-16 19:26Z12 DAYS AGO

Reserved

2026-08-26

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

CWE-125Out-of-bounds ReadBase
CWE-193Off-by-one ErrorBase

Data version

5.2

Document digest

477a09ac12ffafc4c70613c8ab602a2bc26451ca926fdf8f0b932aaa25a884f5

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 437e0a3854b3a44ec15afa9ab88ec215adf3a2fd, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2b70f61f569bb29acb380e6f616a1bbdee15668f, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2393f0bd7a467ad475598f3a5b9de27ca36e3037, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < aff589556ed772cb1c0c2d7b4d91ec45c0c39416, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < eeef3b81f449560653662df2dde6f6fe247c5365, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a, 2.6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/abb8c32b88ea3f46beb68c34fe9a3ac8ed664e7e
git.kernel.orghttps://git.kernel.org/stable/c/437e0a3854b3a44ec15afa9ab88ec215adf3a2fd
git.kernel.orghttps://git.kernel.org/stable/c/910c33e4a8c046c3cc1fa5a465a4d41a1bb398f1
git.kernel.orghttps://git.kernel.org/stable/c/2b70f61f569bb29acb380e6f616a1bbdee15668f
git.kernel.orghttps://git.kernel.org/stable/c/2393f0bd7a467ad475598f3a5b9de27ca36e3037
git.kernel.orghttps://git.kernel.org/stable/c/aff589556ed772cb1c0c2d7b4d91ec45c0c39416
git.kernel.orghttps://git.kernel.org/stable/c/eeef3b81f449560653662df2dde6f6fe247c5365
git.kernel.orghttps://git.kernel.org/stable/c/ef6400ca25a13fd6dedbe8ef4a1d0979bbbfe88a

07 Fixed in

Debian 12

linux
Fixed in 6.1.180-1

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

Debian 13

linux
Fixed in 6.12.100-1

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

Debian 14

linux
Fixed in 7.1.5-1

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