CVE-2026-90303: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-90303DEBIAN-CVE-2026-90303
Published 17-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-90303 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.7% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.22%
0%100%
Low · +0.01 pp in 30 days
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-2026:11893-1

Timeline

  1. 17-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

+0.01 pp

From 0.21% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.22%

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

Ubuntu169 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)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < ab14f07952adfe735d86a53518f8cd576dfd5892 | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 07e4d5380f2a844ab7a1b440dde350caf561cbb0 | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 2a14d7797a49a47bccd1a9327fd69da838dcb0dd | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 63e3c958a602d0896a101a897c2361878c266ca7 | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 59bbf86d0ff9373bfa033ca123c1e924f09f1eba | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < c71f9a56520b419e55d173052629f2324deb5549 | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 720408d98d9fb3c91a12090436734c8c61f04545 | ≥ 6d021b724481fbb908eb29384898deb9f00dfe70, < 1039bffd6ae9c75b42b7d148d6c1106134107b66 | 4.0

3 vendors · 172 products

References

13 links
Show all 13 references