8.8

CVE-2026-98171: linux

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-98171DEBIAN-CVE-2026-98171
Published 06-10-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-98171 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12131-1

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs Fix several related bounds checking and pointer lifecycle issues in receive_encrypted_standard()'s handling of compound encrypted frames: - Clear next_buffer after assigning it to server->bigbuf. A stale next_buffer pointer can lead to a use-after-free on subsequent error paths. - Update pdu_length to the decrypted plaintext size (buf_size). Using the pre-decryption length allows NextCommand to point into stale ciphertext residue. - Reject next_cmd values smaller than MID_HEADER_SIZE(server). - Fix an integer overflow in the upper bound check by verifying pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the trailing slice is large enough for a header.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

06-10-202621-10-2026
EPSS score
0.51%

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

Ubuntu165 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.113-1 | < 7.2.8-1
Linux1 product
  • linux≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 72eaef1f37a3b6bec11c342736834dc3707be3e4 | ≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 491e33144dee872cffda207f6fcb09260728f803 | ≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 8749946579708ea0d339034bb7f423a67dbe89cf | ≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 96c436e4b010711452b2872558938f4ef276492a | ≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 858d5ac22cb889266993e7670f9f0c4f4aeedd78 | ≥ b24df3e30cbf48255db866720fb71f14bf9d2f39, < 05762c5bc1cfdcac36747994fde2c04387a457f1 | 4.19

3 vendors · 167 products

References

10 links