Re: CVE-2025-39898: e1000e: fix heap overflow in e1000_set_eeprom

[Tony Nguyen <anthony.l.nguyen@intel.com>]

On 10/24/2025 4:26 AM, Greg Kroah-Hartman wrote:
> On Fri, Oct 24, 2025 at 12:53:44PM +0200, Steffen Jaeckel wrote:
>> Hi Greg,
>>
>> On 2025-10-01 09:43, Greg Kroah-Hartman wrote:
>>> From: Greg Kroah-Hartman <gregkh@kernel.org>
>>>
>>> Description
>>> ===========
>>>
>>> In the Linux kernel, the following vulnerability has been resolved:
>>>
>>> e1000e: fix heap overflow in e1000_set_eeprom
>>>
>>> Fix a possible heap overflow in e1000_set_eeprom function by adding
>>> input validation for the requested length of the change in the EEPROM.
>>> In addition, change the variable type from int to size_t for better
>>> code practices and rearrange declarations to RCT.
>>>
>>> The Linux kernel CVE team has assigned CVE-2025-39898 to this issue.
>>>
>>>
>>> Affected and fixed versions
>>> ===========================
>>>
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 5.4.299 with commit ea832ec0583e2398ea0c5ed8d902c923e16f53c4
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 5.10.243 with commit ce8829d3d44b8622741bccca9f4408bc3da30b2b
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 5.15.192 with commit 99a8772611e2d7ec318be7f0f072037914a1f509
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 6.1.151 with commit b48adcacc34fbbc49046a7ee8a97839bef369c85
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 6.6.105 with commit 50a84d5c814039ad2abe2748aec3e89324a548a7
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 6.12.46 with commit b370f7b1f470a8d5485cc1e40e8ff663bb55d712
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 6.16.6 with commit 0aec3211283482cfcdd606d1345e1f9acbcabd31
>>> 	Issue introduced in 2.6.24 with commit bc7f75fa97884d41efbfde1397b621fefb2550b4 and fixed in 6.17 with commit 90fb7db49c6dbac961c6b8ebfd741141ffbc8545
>>>
>>> [...]
>>
>> we believe that this CVE is invalid since the sole caller is
>> `net/ethtool/ioctl.c:ethtool_set_eeprom()`, which already does all the
>> necessary checks before invoking a driver specific implementation.
> 
> Great, will this commit then be reverted?  I'll go revoke this cve now,
> thanks for the review.

We'll prepare a revert for this.

Thanks,
Tony