How much/what hardware does the rowhammer DRAM bug affects?

Georgi Guninski guninski at
Fri Sep 18 00:03:42 PDT 2015

On Fri, Sep 18, 2015 at 06:54:58AM +0000, jim bell wrote:
>   From: Georgi Guninski <guninski at>
> On Wed, Sep 16, 2015 at 11:46:26PM -0400, grarpamp wrote:
> >
> >p. 32 of the PDF:
> >.– Simple ECC (e.g., SECDED) cannot prevent all errors
> >From wikipedia:  Tests show that simple ECC solutions, providing
> >single-error correction and double-error detection (SECDED)
> >capabilities, are not able to correct or detect all observed
> >disturbance errors because some of them include more than two flipped
> >bits per memory word.[1]:8[11]:32
> >
> But all single-bit and triple-bit errors are detectable by parity, and so are all double-bit errors using ECC. 
> Jim Bell  

AFAICT Rowhammer (non-weaponized) publicly appeared in:

Flipping Bits in Memory Without Accessing Them:
An Experimental Study of DRAM Disturbance Errors
(from 2014)

On p. 8:
Therefore, we conclude that SECDED is not failsafe against disturbance
Table 5. Uncorrectable multi-bit errors (in bold)

Consider publishing your claim as counterexample to the paper
(possibly on

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