CVE-2026-89818drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression 6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting the parser loop far past the end of the message BO. Triggering it additionally requires a ~4GiB mapping so that msg[1] survives the earlier "header does not fit in BO" check. Rewrite the test in division form, which is overflow-free by construction. Also update the message to reflect that msg is invalid.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 88411caee8f576d6b5abf6531232fcc0ce756dc5 before c2340281be4ddacb8c203e2bce59b126d1d6c4c8; from c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e before 6dceaeceaa7c8396339f3ea34b0110cb912ca61b; 7688143ca62edeecacb3ba0a2cea129dbd262a18 builds before 47799e1f893d47d8af231710a61065e3ec8a13e8; 63b51e8a9d54317d31cc3856c1e12407070d5fc2 builds before 7e28853c78c20bb8ba4c1dba702430cd05e09f76; from b193019860d61e92da395eae2011f2f6716b182f before 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3; from b193019860d61e92da395eae2011f2f6716b182f before 4d7390530853eb7befda9cc786e4c86e8ad7ac9e; f55552adb100eb54a6e6dabff4fbdc8679bd3fa0; 82c535eff05490c71153af57de9fe85502fcb5d5; and 11 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8
- https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b
- https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8
- https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76
- https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3
- https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.