CVE-2024-56568iommu/arm-smmu: Defer probe of clients after smmu device bound
- 4.7MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Defer probe of clients after smmu device bound Null pointer dereference occurs due to a race between smmu driver probe and client driver probe, when of_dma_configure() for client is called after the iommu_device_register() for smmu driver probe has executed but before the driver_bound() for smmu driver has been called. Following is how the race occurs: T1:Smmu device probe T2: Client device probe really_probe() arm_smmu_device_probe() iommu_device_register() really_probe() platform_dma_configure() of_dma_configure() of_dma_configure_id() of_iommu_configure() iommu_probe_device() iommu_init_device() arm_smmu_probe_device() arm_smmu_get_by_fwnode() driver_find_device_by_fwnode() driver_find_device() next_device() klist_next() /* null ptr assigned to smmu */ /* null ptr dereference while smmu->streamid_mask */ driver_bound() klist_add_tail() When this null smmu pointer is dereferenced later in arm_smmu_probe_device, the device crashes. Fix this by deferring the probe of the client device until the smmu device has bound to the arm smmu driver. [will: Add comment]
Timeline
ID reserved
By Linux
Published
- 17 months later
· 17 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Affected products
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < c2527d07c7e9cda2c6165d5edccf74752baac1b0
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < dc02407ea952e20c544a078a6be2e6f008327973
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < 4a9485918a042e3114890dfbe19839a1897f8b2c
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < 5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8
- affected 021bb8420d44cf56102d44fca9af628625e75482 – < 229e6ee43d2a160a1592b83aad620d6027084aad
- affected 4.9
- unaffected < 4.9
- unaffected 5.10.231 – ≤ 5.10.*
- unaffected 5.15.174 – ≤ 5.15.*
- unaffected 6.1.120 – ≤ 6.1.*
- unaffected 6.6.66 – ≤ 6.6.*
- unaffected 6.12.4 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References8
- https://git.kernel.org/stable/c/c2527d07c7e9cda2c6165d5edccf74752baac1b0 (opens in a new tab)
- https://git.kernel.org/stable/c/dc02407ea952e20c544a078a6be2e6f008327973 (opens in a new tab)
- https://git.kernel.org/stable/c/f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5 (opens in a new tab)
- https://git.kernel.org/stable/c/4a9485918a042e3114890dfbe19839a1897f8b2c (opens in a new tab)
- https://git.kernel.org/stable/c/5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8 (opens in a new tab)
- https://git.kernel.org/stable/c/229e6ee43d2a160a1592b83aad620d6027084aad (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-53216 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-56568)Record last updated .