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
** CVE added: https://cve.org/CVERecord?id=CVE-2025-38477
** CVE added: https://cve.org/CVERecord?id=CVE-2025-38500
** CVE added: https://cve.org/CVERecord?id=CVE-2025-38617
** CVE added: https://cve.org/CVERecord?id=CVE-2025-38618
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https://bugs.launchpad.net/bugs/2122719
Title:
azure: backport "cifs: fix pagecache leak when do writepages"
Status in linux-azure package in Ubuntu:
Fix Committed
Status in linux-azure source package in Noble:
Fix Released
Bug description:
BugLink: https://bugs.launchpad.net/bugs/2122719
[Impact]
A memory leak which was introduced in the smb.ko module by commit
f3dc1bdb6b0b ("cifs: Fix writeback data corruption") is causing
hangups on VMs due to memory starvation. This introduces a high risk
of data corruption for users running the 6.8 Azure kernel.
[Fix]
Backport the fix:
https://lore.kernel.org/linux-
cifs/[email protected]/
to the n:azure tree.
[Test plan]
Build tested only; Microsoft will validate the bug fix.
[Where problems could occur]
Issues with this patch could cause hangs/lockups during CIFS writeback
operations, particularly in systems with a high CPU count.
[Other info]
SF #00418307
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