This bug was fixed in the package linux-azure - 6.8.0-1040.46
---------------
linux-azure (6.8.0-1040.46) noble; urgency=medium
* noble/linux-azure: 6.8.0-1040.46 -proposed tracker (LP: #2125522)
* azure: backport "cifs: fix pagecache leak when do writepages"
(LP: #2122719)
- cifs: fix pagecache leak when do writepages
* azure: backport "hv_netvsc: Fix panic during namespace deletion with VF"
(LP: #2120803)
- hv_netvsc: Fix panic during namespace deletion with VF
* azure: backport various SMB multichannel fixes (LP: #2118807)
- cifs: reset connections for all channels when reconnect requested
- cifs: update dstaddr whenever channel iface is updated
- cifs: dns resolution is needed only for primary channel
- cifs: deal with the channel loading lag while picking channels
- cifs: serialize other channels when query server interfaces is pending
- cifs: do not disable interface polling on failure
- smb: client: fix potential deadlock when reconnecting channels
- smb: client: fix warning when reconnecting channel
* net: mana: Use page pool fragments for RX buffers instead of full pages to
improve memory efficiency (LP: #2121570)
- net: mana: Use page pool fragments for RX buffers instead of full pages
to improve memory efficiency.
linux-azure (6.8.0-1039.45) noble; urgency=medium
* noble/linux-azure: 6.8.0-1039.45 -proposed tracker (LP: #2125074)
[ Ubuntu: 6.8.0-85.85 ]
* noble/linux: 6.8.0-85.85 -proposed tracker (LP: #2125109)
* Packaging resync (LP: #1786013)
- [Packaging] resync git-ubuntu-log
* CVE-2025-38500
- xfrm: interface: fix use-after-free after changing collect_md xfrm
interface
* TLS socket disconnection causes various issues (LP: #2120516) //
CVE-2025-37756
- net: tls: explicitly disallow disconnect
* CVE-2025-38477
- net/sched: sch_qfq: Fix race condition on qfq_aggregate
- net/sched: sch_qfq: Avoid triggering might_sleep in atomic context in
qfq_delete_class
* CVE-2025-38618
- vsock: Do not allow binding to VMADDR_PORT_ANY
* CVE-2025-38617
- net/packet: fix a race in packet_set_ring() and packet_notifier()
* CVE-2025-37785
- ext4: fix OOB read when checking dotdot dir
-- John Cabaj <[email protected]> Tue, 23 Sep 2025 14:23:09
-0500
** Changed in: linux-azure (Ubuntu Noble)
Status: Fix Committed => Fix Released
** CVE added: https://cve.org/CVERecord?id=CVE-2025-37756
** CVE added: https://cve.org/CVERecord?id=CVE-2025-37785
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https://bugs.launchpad.net/bugs/2118807
Title:
azure: backport various SMB multichannel fixes
Status in linux-azure package in Ubuntu:
Fix Committed
Status in linux-azure source package in Noble:
Fix Released
Status in linux-azure source package in Plucky:
Fix Released
Bug description:
BugLink: https://bugs.launchpad.net/bugs/2118807
[Impact]
Users of the Azure kernel have been experiencing instabilities when using
SMB multichannel mounts, especially when the share migrates to a new
server.
[Fix]
Microsoft has pointed us to the following patches, all of which have
already been merged to mainline as well as several stable branches:
cifs: reset connections for all channels when reconnect requested (upstream
6.1, 6.6, 6.12, 6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1f396b9bfe39aaf55ea74a7005806164b236653d
cifs: update dstaddr whenever channel iface is updated (upstream 6.6, 6.12,
6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1846893991f3b4ec8a0cc12219ada153f0814d6
cifs: dns resolution is needed only for primary channel (upstream 6.6, 6.12,
6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4f60a053a2534c3e510ba0c1f8727566adf8317
cifs: deal with the channel loading lag while picking channels (upstream 6.6,
6.12, 6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d590b828b1fd9fa337047ae58fe1c4c6f43609
cifs: serialize other channels when query server interfaces is pending
(upstream 6.6, 6.12, 6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b5e3e6e28cf3853566ba5d816f79aba5be579158
cifs: do not disable interface polling on failure (upstream 6.6, 6.12, 6.15,
and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=42ca547b13a20e7cbb04fbdf8d5f089ac4bb35b7
smb: client: fix potential deadlock when reconnecting channels (upstream 6.6,
6.12, 6.15, and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=711741f94ac3cf9f4e3aa73aa171e76d188c0819
smb: client: fix warning when reconnecting channel (upstream 6.6, 6.12, 6.15,
and 6.16)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3bbe46716092d8ef6b0df4b95
6f585c5cd0fc78e
All patches above have been cleanly cherry-picked into the Noble/Plucky
linux-azure trees.
[Test plan]
Build tested only; Microsoft will validate the bug fix.
[Where problems could occur]
The changes here could cause errors when managing SMB filesystems with
channels connected to multiple different servers.
[Other info]
SF #00413632
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