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Bug#1136793: linux-image-7.0.4+deb13-amd64: ipv6 tempaddr renewal drops old address immediately

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On Sat, May 16, 2026 at 03:37:56AM +0200, Andreas Ferber wrote:
> Package: src:linux
> Version: 7.0.4-1~bpo13+1
> Severity: normal
> Tags: ipv6
> X-Debbugs-Cc: debian-amd64@lists.debian.org
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Hi,
> 
> this may be related to my other bug report about premature renewal of
> IPv6 temporary addresses (#1136792).
> 
> On my main LAN interface (br0) I have IPv6 privacy extensions enabled
> (sysctl net.ipv6.conf.br0.use_tempaddr=2). Since upgrading to this
> kernel (7.0.4; previous version was linux-image-6.19.14+deb13-amd64)
> when renewing temporary addresses the old addresses are dropped
> immediately. This kills any existing TCP connections that are still
> using the old address.
> 
> Expected behavior would be that upon tempaddr renewal the old addresses
> remain as deprecated addresses until their valid_lft runs out, thus
> keeping TCP connections alive that are still using an old address. An
> example from a different machine with an older Kernel:
> 
> 7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
>     link/ether <redacted> brd ff:ff:ff:ff:ff:ff
>     inet6 2a00:ffff:ffff:ffff:7608:e249:1da7:2ba4/64 scope global temporary dynamic
>        valid_lft 86392sec preferred_lft 14392sec
>     inet6 2a00:ffff:ffff:ffff:9701:191c:1d06:e160/64 scope global temporary deprecated dynamic
>        valid_lft 86392sec preferred_lft 0sec
>     inet6 2a00:ffff:ffff:ffff:d465:a610:62c7:85a5/64 scope global temporary deprecated dynamic
>        valid_lft 86392sec preferred_lft 0sec
>     inet6 2a00:ffff:ffff:ffff::42/64 scope global noprefixroute
>        valid_lft forever preferred_lft forever
>     inet6 2a00:ffff:ffff:ffff:bca8:fe25:a3dd:d224/64 scope global temporary deprecated dynamic
>        valid_lft 86392sec preferred_lft 0sec
> 
> Note that this issue has nothing to do with the short valid_lft for the
> public addresses (2a02:908:...) you can see in the network info below.
> The issue also affects the ULA addresses (fd40:..) which have a much
> longer lifetime, and I'm also seeing it on another machine in a
> different network where the public prefix has a longer lifetime as well.

Same questions here as in #1136792, specifically https://bugs.debian.org/1136792#10

Regards,
Salvatore

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Bug#1136793: linux-image-7.0.4+deb13-amd64: ipv6 tempaddr renewal drops old address immediately Salvatore Bonaccorso <carnil@debian.org> - 2026-05-16 08:30 +0200
  Processed: Re: Bug#1136793: linux-image-7.0.4+deb13-amd64: ipv6  tempaddr renewal drops old address immediately "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-16 08:30 +0200

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