9.1

CVE-2026-46155: smb/client: fix out-of-bounds read in smb2_compound_op()

Modified
AliasesUBUNTU-CVE-2026-46155DEBIAN-CVE-2026-46155
Published 28-05-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-46155 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 41.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · -0.17 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 10
OPENSUSE-SU-2026:10954-1RHSA-2026:36018RHSA-2026:36541RHSA-2026:64767RHSA-2026:65708USN-8488-1

Timeline

  1. 28-05-2026
    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 out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

Decrease -0.17 pp

From 0.65% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu115 products
  • linuxAll versions (No fix recorded) | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 7449d736bbbd160c76b01b8fcdf72f58a8757d4b, < dffb44b2e06a2908e249f0f93156fc987eee1d1c | ≥ ea41367b2a602f602ea6594fc4a310520dcc64f4, < 9b3af35645ff9cd334edc130249f9a2fb2bea25f | ≥ ea41367b2a602f602ea6594fc4a310520dcc64f4, < 512d33bc8ea4ea5c19728ee118715f4b1f4d1926 | ≥ ea41367b2a602f602ea6594fc4a310520dcc64f4, < a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c | ≥ ea41367b2a602f602ea6594fc4a310520dcc64f4, < 8d09328dfda089675e4c049f3f256064a1d1996b | ≥ 6.6.32, < 6.6.140 | 6.9
  • linux_kernel≥ 6.6.32, < 6.6.140 | ≥ 6.9, < 6.12.88 | ≥ 6.13, < 6.18.30 | ≥ 6.19, < 7.0.7 | 7.1:rc1 | 7.1:rc2
Debian1 product
  • linux< 6.12.88-1 | < 7.0.7-1

3 vendors · 118 products

References

19 links
Show all 19 references