dma-buf: heaps: Fix off-by-one in CMA heap fault handler
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-193 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.11 and later | 5.15.168, 6.1.111, 6.6.52, 6.10.11, 6.11 | Patch available | CNA |
- Linux VendorLinux Affected 5.11 and later Fixed in 5.15.168, 6.1.111, 6.6.52, 6.10.11, 6.11 Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.11 to before 5.15.168; 5.16 to before 6.1.111; 6.2 to before 6.6.52; 6.7 to before 6.10.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* | 6.11 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* | 6.11 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:* | 6.11 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:* | 6.11 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:* | 6.11 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:* | 6.11 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:* | 6.11 rc7 | Vulnerable | Linux |
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.11 to before 5.15.168; 5.16 to before 6.1.111; 6.2 to before 6.6.52; 6.7 to before 6.10.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* Versions 6.11 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* Versions 6.11 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:* Versions 6.11 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:* Versions 6.11 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:* Versions 6.11 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:* Versions 6.11 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:* Versions 6.11 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.168, 6.1.111, 6.6.52, 6.10.11, 6.11
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-46852
- 2026-10-03 Alias added: GHSA-5793-wfxr-j725
- 2026-11-03 CISA SSVC decision points changed
References
Patch 5
- https://git.kernel.org/stable/c/79cce5e81d20fa9ad553be439d665ac3302d3c95
- https://git.kernel.org/stable/c/84175dc5b2c932266a50c04e5ce342c30f817a2f
- https://git.kernel.org/stable/c/eb7fc8b65cea22f9038c52398c8b22849e9620ea
- https://git.kernel.org/stable/c/e79050882b857c37634baedbdcf7c2047c24cbff
- https://git.kernel.org/stable/c/ea5ff5d351b520524019f7ff7f9ce418de2dad87
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Sources
- CVE-2024-46852 · CVE Program
- CVE-2024-46852 · NVD
- FIRST EPSS
- GHSA-5793-wfxr-j725 · GitHub Advisory Database · CC BY 4.0
- CVE-2024-46852 · Red Hat security data · CC BY 4.0
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