Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5 swiotlb swiotlb_alloc_tlb vaddr allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.77

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. Affected is the function swiotlb_alloc_tlb of the component swiotlb. Such manipulation of the argument vaddr leads to allocation of resources. This vulnerability is listed as CVE-2026-90387. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. It has been rated as very critical. Affected by this issue is the function swiotlb_alloc_tlb of the component swiotlb. The manipulation of the argument vaddr with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: swiotlb: Preserve allocation virtual address for dynamic pools swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted pool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the atomic pool is backed by remapped virtual addresses, which are not the same as the direct-map addresses returned by phys_to_virt(). swiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address from the physical start address. For atomic-pool backed allocations this stores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes that address to dma_free_from_pool(), which will fail to recognize the chunk Pass the virtual address returned by the allocation path into swiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This keeps the pool free path using the same virtual address as the allocator.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-90387 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/17/2026). The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 68bf3ebd8e7020dae58e8aa14c7d482738bff9a8/45507dcb0847e96add4455274b12df0eca6590b4/35e0103177826430b5df888b1506239d41e76ab5/c1f4d7763cdf1b9e0d35c14aa6f52d0512a36319/57d29044d0f29a76c6ec0c112c8c7371d5608dc7 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 68bf3ebd8e7020dae58e8aa14c7d482738bff9a8/45507dcb0847e96add4455274b12df0eca6590b4/35e0103177826430b5df888b1506239d41e76ab5/c1f4d7763cdf1b9e0d35c14aa6f52d0512a36319/57d29044d0f29a76c6ec0c112c8c7371d5608dc7

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90387 (🔒)
GCVE (CVE): GCVE-0-2026-90387
GCVE (VulDB): GCVE-100-406988

Entryinfo

Created: 09/17/2026 22:25
Changes: 09/17/2026 22:25 (60)
Complete: 🔍
Cache ID: 216::103

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