5.5

CVE-2024-26785: iommufd: Fix protection fault in iommufd_test_syz_conv_iova

Analyzed
AliasesUBUNTU-CVE-2024-26785DEBIAN-CVE-2024-26785
Published 04-04-2024Last modified 11-05-2026

Vulnerability summary

CVE-2024-26785 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 13.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
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 6 · Related 5
RHSA-2024:9315SUSE-SU-2024:2802-1SUSE-SU-2024:2896-1SUSE-SU-2024:2973-1SUSE-SU-2025:20008-1SUSE-SU-2025:20028-1

Timeline

  1. 04-04-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix protection fault in iommufd_test_syz_conv_iova Syzkaller reported the following bug: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] Call Trace: lock_acquire lock_acquire+0x1ce/0x4f0 down_read+0x93/0x4a0 iommufd_test_syz_conv_iova+0x56/0x1f0 iommufd_test_access_rw.isra.0+0x2ec/0x390 iommufd_test+0x1058/0x1e30 iommufd_fops_ioctl+0x381/0x510 vfs_ioctl __do_sys_ioctl __se_sys_ioctl __x64_sys_ioctl+0x170/0x1e0 do_syscall_x64 do_syscall_64+0x71/0x140 This is because the new iommufd_access_change_ioas() sets access->ioas to NULL during its process, so the lock might be gone in a concurrent racing context. Fix this by doing the same access->ioas sanity as iommufd_access_rw() and iommufd_access_pin_pages() functions do.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.22% 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.

Ubuntu65 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 9227da7816dd1a42e20d41e2244cb63c205477ca, < fd4d5cd7a2e8f08357c9bfc0905957cffe8ce568 | ≥ 9227da7816dd1a42e20d41e2244cb63c205477ca, < fc719ecbca45c9c046640d72baddba3d83e0bc0b | ≥ 9227da7816dd1a42e20d41e2244cb63c205477ca, < cf7c2789822db8b5efa34f5ebcf1621bc0008d48 | 6.6
  • linux_kernel≥ 6.6, < 6.7.9 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3 | 6.8:rc4 | 6.8:rc5 | 6.8:rc6
Debian1 product
  • linux< 6.7.9-1

3 vendors · 68 products

References

7 links