01 Record

CVE-2026-89662

NFSD: Prevent lock owner use-after-free during client teardown

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

NFSD: Prevent lock owner use-after-free during client teardown

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

0.69% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 52.3% 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

Received. 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

2026-09-11 19:45Z1 MO AGO

Last updated

2026-10-19 08:50Z10 DAYS AGO

Reserved

2026-09-11

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-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

f0661fbb2420d63095029a4738172d39ddad01279a68aed59ae2fff887be4e78

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux68ef3bc3166468678d5e1fdd216628c35bd1186f to < 42d7954b0a1907d4ef122aef94561952a033cdc3, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < b8bad5a11416b26cc7fd4b18fba46d75ff636558, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < 1ce74d1b7770e69735e8f8e509807af4ff9c8ee7, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < a6ead6fff3a7d03e49845f048f7000a2e0d34431, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < 4804c58f73a80d12df1de323bf97a164f6ee8743, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < 8cf4ff0a7c083dd5e0067f517d63979b74b66649, 68ef3bc3166468678d5e1fdd216628c35bd1186f to < 5e2fa29d223a9a1e6a948e40b109d09081d1decd, e294c4c2d33b7307a89cdf31bec08a112d6a9297, 797bfd05d4040fbf766198b3cfcc1838002cc890, 0f44e9da465ea259b6c9f31a627f3c50a16e1679, 4.9.91 to < 4.10, 4.14.31 to < 4.15, 4.15.14 to < 4.16, 4.16—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/42d7954b0a1907d4ef122aef94561952a033cdc3
git.kernel.orghttps://git.kernel.org/stable/c/bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a
git.kernel.orghttps://git.kernel.org/stable/c/b8bad5a11416b26cc7fd4b18fba46d75ff636558
git.kernel.orghttps://git.kernel.org/stable/c/1ce74d1b7770e69735e8f8e509807af4ff9c8ee7
git.kernel.orghttps://git.kernel.org/stable/c/a6ead6fff3a7d03e49845f048f7000a2e0d34431
git.kernel.orghttps://git.kernel.org/stable/c/4804c58f73a80d12df1de323bf97a164f6ee8743
git.kernel.orghttps://git.kernel.org/stable/c/8cf4ff0a7c083dd5e0067f517d63979b74b66649
git.kernel.orghttps://git.kernel.org/stable/c/5e2fa29d223a9a1e6a948e40b109d09081d1decd

07 Fixed in

Debian 12

linux
Fixed in 6.1.190-1
linux-6.12
Fixed in 6.12.111-1~deb12u1

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

Debian 13

linux
Fixed in 6.12.111-1

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

Debian 14

linux
Fixed in 7.2.6-1

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