CVE-2021-47342

In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible UAF when remounting r/o a mmp-protected file system After commit 618f003199c6 ("ext4: fix memory leak in ext4_fill_super"), after the file system is remounted read-only, there is a race where the kmmpd thread can exit, causing sbi->s_mmp_tsk to point at freed memory, which the call to ext4_stop_mmpd() can trip over. Fix this by only allowing kmmpd() to exit when it is stopped via ext4_stop_mmpd(). Bug-Report-Link: [email protected]

• CVE-url: https://ubuntu.com/security/CVE-2024-50180
  • fbdev: sisfb: Fix strbuf array overflow
• CVE-url: https://ubuntu.com/security/CVE-2023-52522
  • net: fix possible store tearing in neigh_periodic_work()
• CVE-url: https://ubuntu.com/security/CVE-2024-40911
  • wifi: cfg80211: Lock wiphy in cfg80211_get_station
• CVE-url: https://ubuntu.com/security/CVE-2024-43863
  • drm/vmwgfx: Fix a deadlock in dma buf fence polling
• CVE-url: https://ubuntu.com/security/CVE-2024-44931
  • gpio: prevent potential speculation leaks in gpio_device_get_desc()
• CVE-url: https://ubuntu.com/security/CVE-2024-23848
  • media: cec: cec-api: add locking in cec_release()
  • media: cec: core: avoid recursive cec_claim_log_addrs
• CVE-url: https://ubuntu.com/security/CVE-2024-50229
  • nilfs2: fix potential deadlock with newly created symlinks
• CVE-url: https://ubuntu.com/security/CVE-2024-50171
  • net: systemport: fix potential memory leak in bcm_sysport_xmit()
• CVE-url: https://ubuntu.com/security/CVE-2024-50233
  • staging: iio: frequency: ad9832: fix division by zero in ad9832_calc_freqreg()
• CVE-url: https://ubuntu.com/security/CVE-2024-50134
  • drm/vboxvideo: Replace fake VLA at end of vbva_mouse_pointer_shape with real VLA
• CVE-url: https://ubuntu.com/security/CVE-2024-44938
  • jfs: Fix shift-out-of-bounds in dbDiscardAG
• CVE-url: https://ubuntu.com/security/CVE-2024-50117
  • drm/amd: Guard against bad data for ATIF ACPI method
• CVE-url: https://ubuntu.com/security/CVE-2024-49902
  • jfs: check if leafidx greater than num leaves per dmap tree
• CVE-url: https://ubuntu.com/security/CVE-2023-52799
  • jfs: fix array-index-out-of-bounds in dbFindLeaf
• CVE-url: https://ubuntu.com/security/CVE-2024-49966
  • ocfs2: cancel dqi_sync_work before freeing oinfo
• CVE-url: https://ubuntu.com/security/CVE-2024-50267
  • USB: serial: io_edgeport: fix use after free in debug printk
• CVE-url: https://ubuntu.com/security/CVE-2024-50230
  • nilfs2: fix kernel bug due to missing clearing of checked flag
• CVE-url: https://ubuntu.com/security/CVE-2024-50302
  • HID: core: zero-initialize the report buffer
• CVE-url: https://ubuntu.com/security/CVE-2024-50278
  • dm cache: fix out-of-bounds access to the dirty bitset when resizing
  • dm cache: fix potential out-of-bounds access on the first resume
• CVE-url: https://ubuntu.com/security/CVE-2024-50234
  • wifi: iwlegacy: Clear stale interrupts before resuming device
• CVE-url: https://ubuntu.com/security/CVE-2024-50301
  • security/keys: fix slab-out-of-bounds in key_task_permission
• CVE-url: https://ubuntu.com/security/CVE-2024-50143
  • overflow: Add _must_check attribute to check*() helpers
  • compiler.h: drop fallback overflow checkers
  • overflow: Allow mixed type arguments
  • udf: fix uninit-value use in udf_get_fileshortad
• CVE-url: https://ubuntu.com/security/CVE-2024-53061
  • media: s5p-jpeg: prevent buffer overflows
• CVE-url: https://ubuntu.com/security/CVE-2024-57798
  • drm/dp-mst-helper: Remove hotplug callback
  • drm/dp_mst: Remove huge conditional in drm_dp_mst_handle_up_req()
  • drm/dp_mst: Refactor drm_dp_mst_handle_up_req()
  • drm/dp_mst: Rename drm_dp_add_port and drm_dp_update_port
  • drm/dp_mst: Handle UP requests asynchronously
  • drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()
• CVE-url: https://ubuntu.com/security/CVE-2023-52854
  • padata: make padata_do_parallel find alternate callback CPU
  • padata: allocate workqueue internally
  • crypto: pcrypt - remove padata cpumask notifier
  • padata, pcrypt: take CPU hotplug lock internally in padata_alloc_possible
  • padata: use separate workqueues for parallel and serial work
  • padata: unbind parallel jobs from specific CPUs
  • workqueue: Make…

• Bionic update: upstream stable patchset 2022-04-13 (LP: #1968932) // CVE- url: https://ubuntu.com/security/CVE-2022-23041
  • xen/gnttab: fix gnttab_end_foreign_access() without page specified
• Bionic update: upstream stable patchset 2023-01-20 (LP: #2003596) // CVE- url: https://ubuntu.com/security/CVE-2022-49850
  • nilfs2: fix deadlock in nilfs_count_free_blocks()
• CVE-url: https://ubuntu.com/security/CVE-2024-42305
  • ext4: check dot and dotdot of dx_root before making dir indexed
• CVE-url: https://ubuntu.com/security/CVE-2024-53168
  • sunrpc: fix one UAF issue caused by sunrpc kernel tcp socket
• CVE-url: https://ubuntu.com/security/CVE-2024-26915
  • drm/amdgpu: Add check to prevent IH overflow
  • drm/amdgpu: Reset IH OVERFLOW_CLEAR bit
• CVE-url: https://ubuntu.com/security/CVE-2024-56770
  • net/sched: netem: account for backlog updates from child qdisc
  • netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
• Bionic update: upstream stable patchset 2022-01-14 (LP: #1957957) // CVE- url: https://ubuntu.com/security/CVE-2021-47587
  • net: systemport: Add global locking for descriptor lifecycle
• Bionic update: upstream stable patchset 2021-06-01 (LP: #1930472) // CVE- url: https://ubuntu.com/security/CVE-2021-46959
  • spi: Fix use-after-free with devm_spi_alloc_*
• CVE-url: https://ubuntu.com/security/CVE-2024-26689
  • ceph: prevent use-after-free in encode_cap_msg()
• CVE-url: https://ubuntu.com/security/CVE-2024-53066
  • nfs: Fix KMSAN warning in decode_getfattr_attrs()
• CVE-url: https://ubuntu.com/security/CVE-2024-49944
  • sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start
• CVE-url: https://ubuntu.com/security/CVE-2024-50237
  • wifi: mac80211: do not pass a stopped vif to the driver in .get_txpower
• CVE-url: https://ubuntu.com/security/CVE-2024-46780
  • nilfs2: protect references to superblock parameters exposed in sysfs
• CVE-url: https://ubuntu.com/security/CVE-2024-53063
  • media: dvbdev: prevent the risk of out of memory access
  • media: dvbdev: fix the logic when DVB_DYNAMIC_MINORS is not set
• CVE-url: https://ubuntu.com/security/CVE-2021-47150
  • net: fec: fix the potential memory leak in fec_enet_init()
• CVE-url: https://ubuntu.com/security/CVE-2024-53140
  • netlink: terminate outstanding dump on socket close
• CVE-url: https://ubuntu.com/security/CVE-2025-21971
  • net_sched: Prevent creation of classes with TC_H_ROOT
• CVE-url: https://ubuntu.com/security/CVE-2023-52572
  • cifs: Fix UAF in cifs_demultiplex_thread()
• CVE-url: https://ubuntu.com/security/CVE-2025-37785
  • ext4: fix OOB read when checking dotdot dir
• Bionic update: upstream stable patchset 2021-07-14 (LP: #1936231) // CVE- url: https://ubuntu.com/security/CVE-2021-47277
  • kvm: avoid speculation-based attacks from out-of-range memslot accesses
• CVE-url: https://ubuntu.com/security/CVE-2022-49740
  • wifi: brcmfmac: Check the count value of channel spec to prevent out-of- bounds reads
• Bionic update: upstream stable patchset 2022-07-25 (LP: #1982782) // CVE- url: https://ubuntu.com/security/CVE-2022-49404
  • RDMA/hfi1: Fix potential integer multiplication overflow errors
• Bionic update: upstream stable patchset 2023-03-03 (LP: #2009237) // CVE- url: https://ubuntu.com/security/CVE-2022-49757
  • EDAC/highbank: Fix memory leak in highbank_mc_probe()
• Bionic update: upstream stable patchset 2022-07-25 (LP: #1982782) // CVE- url: https://ubuntu.com/security/CVE-2022-49395
  • um: Fix out-of-bounds read in LDT setup
• CVE-url: https://ubuntu.com/security/CVE-2022-49738
  • f2fs: fix to do sanity check on summary info
  • f2fs: should put a page when checking the summary info
  • f2fs: fix to do sanity check on i_extra_isize in is_alive()
• CVE-url:…

• ext4: fix possible UAF when remounting r/o a mmp-protected file system {CVE-2021-47342}
• ext4: fix memory leak in ext4_fill_super
• net: defer final 'struct net' free in netns dismantle {CVE-2024-56658}
• net/sched: sch_qfq: Fix race condition on qfq_aggregate {CVE-2025-38477}
• ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface() {CVE-2022-48701}
• fix: virtio-net: Add validation for used length {CVE-2021-47352}

• ext4: fix possible UAF when remounting r/o a mmp-protected file system {CVE-2021-47342}
• ext4: fix memory leak in ext4_fill_super
• net: defer final 'struct net' free in netns dismantle {CVE-2024-56658}
• net/sched: sch_qfq: Fix race condition on qfq_aggregate {CVE-2025-38477}
• ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface() {CVE-2022-48701}
• fix: virtio-net: Add validation for used length {CVE-2021-47352}

• ext4: fix possible UAF when remounting r/o a mmp-protected file system {CVE-2021-47342}
• ext4: fix memory leak in ext4_fill_super
• net: defer final 'struct net' free in netns dismantle {CVE-2024-56658}
• net/sched: sch_qfq: Fix race condition on qfq_aggregate {CVE-2025-38477}
• ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface() {CVE-2022-48701}
• fix: virtio-net: Add validation for used length {CVE-2021-47352}