Re: CVE-2023-52435: net: prevent mss overflow in skb_segment()

Re: CVE-2023-52435: net: prevent mss overflow in skb_segment()

[Vlastimil Babka]

On 2/20/24 19:06, Greg Kroah-Hartman wrote:
> The Linux kernel CVE team has assigned CVE-2023-52435 to this issue.
> 
> 
> Affected and fixed versions
> ===========================
> 
> 	Issue introduced in 4.8 with commit 3953c46c3ac7 and fixed in 6.6.11 with commit 95b3904a261a
> 	Issue introduced in 4.8 with commit 3953c46c3ac7 and fixed in 6.7 with commit 23d05d563b7e

Hello,

what is the advice for stable users of versions between 4.19 and 6.1? Are
they not affected?

Thanks,
Vlastimil

> 
> Please see https://www.kernel.org or a full list of currently supported
> kernel versions by the kernel community.
> 
> Unaffected versions might change over time as fixes are backported to
> older supported kernel versions.  The official CVE entry at
> 	https://cve.org/CVERecord/?id=CVE-2023-52435
> will be updated if fixes are backported, please check that for the most
> up to date information about this issue.
> 
> 
> Affected files
> ==============
> 
> The file(s) affected by this issue are:
> 	net/core/skbuff.c
> 
> 
> Mitigation
> ==========
> 
> The Linux kernel CVE team recommends that you update to the latest
> stable kernel version for this, and many other bugfixes.  Individual
> changes are never tested alone, but rather are part of a larger kernel
> release.  Cherry-picking individual commits is not recommended or
> supported by the Linux kernel community at all.  If however, updating to
> the latest release is impossible, the individual changes to resolve this
> issue can be found at these commits:
> 	https://git.kernel.org/stable/c/95b3904a261a9f810205da560e802cc326f50d77
> 	https://git.kernel.org/stable/c/23d05d563b7e7b0314e65c8e882bc27eac2da8e7
> 

Re: CVE-2023-52435: net: prevent mss overflow in skb_segment()

[Greg Kroah-Hartman]

On Wed, Feb 21, 2024 at 10:30:52AM +0100, Vlastimil Babka wrote:
> On 2/20/24 19:06, Greg Kroah-Hartman wrote:
> > The Linux kernel CVE team has assigned CVE-2023-52435 to this issue.
> > 
> > 
> > Affected and fixed versions
> > ===========================
> > 
> > 	Issue introduced in 4.8 with commit 3953c46c3ac7 and fixed in 6.6.11 with commit 95b3904a261a
> > 	Issue introduced in 4.8 with commit 3953c46c3ac7 and fixed in 6.7 with commit 23d05d563b7e
> 
> Hello,
> 
> what is the advice for stable users of versions between 4.19 and 6.1? Are
> they not affected?

They are affected, as the wording here states (and as the json values in
the CVE entry itself show in great detail if you want a machine-parsable
format to use)

The fixes for the other branches are in the next round of -rc kernels to
go out in an hour or so.

thanks,

greg k-h