4.7

CVE-2026-43163: md/bitmap: fix GPF in write_page caused by resize race

Analyzed
AliasesUBUNTU-CVE-2026-43163DEBIAN-CVE-2026-43163
Published 06-05-2026Last modified 11-05-2026

Vulnerability summary

CVE-2026-43163 is a medium (CVSS 4.7) vulnerability in linux. EPSS estimates a 0.09% chance of exploitation in the next 30 days, higher than 0.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.7/10
010
Medium · v3.1 (NVD)
EPSS score
0.09%
0%100%
Low · 0.00 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 50 · Related 36
OPENSUSE-SU-2026:21910-1RHSA-2026:19568RHSA-2026:21209RHSA-2026:21706RHSA-2026:21745RHSA-2026:22334

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over `bitmap->storage.filemap` without locking, while the resize path frees that storage via md_bitmap_file_unmap(). `quiesce()` does not stop the md thread, allowing concurrent access to freed pages. Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.09%

Chance of exploitation in the next 30 days

Percentile

0%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.09% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-134.134
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < 140cc839fbeb1ddb33a8da8811b716d88d3905b7 | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8 | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < d3af62411e19752c663fe4f424dbf49d95a4cc7c | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < d92b8fac294b5f915c50e65ce4ae2262e53614ec | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < a437e3bf30e32846079e470c1ba5ee790bccdf89 | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < 9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < 5f73c8b33df9a605a591eab72d43a969600c1f8c | ≥ d60b479d177a5735b6b4db6ee5280ef6653f50e7, < 46ef85f854dfa9d5226b3c1c46493d79556c9589 | 3.5
  • linux_kernel≥ 3.5, < 5.10.252 | ≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1

3 vendors · 160 products

References

37 links
Show all 37 references