{"id":"SUSE-SU-2021:0434-1","summary":"Security update for the Linux Kernel","details":"The SUSE Linux Enterprise 12 SP4 kernel was updated to receive various security and bugfixes.\n\n\nThe following security bugs were fixed:\n\n- CVE-2021-3348: Fixed a use-after-free in nbd_add_socket() that could be triggered by local attackers (with access to the nbd device) via an I/O request (bnc#1181504).\n- CVE-2021-3347: A use-after-free was discovered in the PI futexes during fault handling, allowing local users to execute code in the kernel (bnc#1181349).\n- CVE-2020-27835: A use-after-free in the infiniband hfi1 driver was found, specifically in the way user calls Ioctl after open dev file and fork. A local user could use this flaw to crash the system (bnc#1179878).\n- CVE-2020-25211: Fixed a buffer overflow in ctnetlink_parse_tuple_filter() which could be triggered by a local attackers by injecting conntrack netlink configuration (bnc#1176395).\n- CVE-2020-25639: Fixed a NULL pointer dereference via nouveau ioctl (bnc#1176846).\n- CVE-2020-29569: Fixed a potential privilege escalation and information leaks related to the PV block backend, as used by Xen (bnc#1179509).\n- CVE-2020-29568: Fixed a denial of service issue, related to processing watch events (bnc#1179508).\n- CVE-2020-0444: Fixed a bad kfree due to a logic error in audit_data_to_entry (bnc#1180027).\n- CVE-2020-0465: Fixed multiple missing bounds checks in hid-multitouch.c that could have led to local privilege escalation (bnc#1180029).\n- CVE-2020-0466: Fixed a use-after-free due to a logic error in do_epoll_ctl and ep_loop_check_proc of eventpoll.c (bnc#1180031).\n- CVE-2020-4788: Fixed an issue with IBM Power9 processors could have allowed a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances (bsc#1177666).\n- CVE-2020-15436: Fixed a use after free vulnerability in fs/block_dev.c which could have allowed local users to gain privileges or cause a denial of service (bsc#1179141).\n- CVE-2020-27068: Fixed an out-of-bounds read due to a missing bounds check in the nl80211_policy policy of nl80211.c (bnc#1180086).\n- CVE-2020-27777: Fixed a privilege escalation in the Run-Time Abstraction Services (RTAS) interface, affecting guests running on top of PowerVM or KVM hypervisors (bnc#1179107).\n- CVE-2020-27786: Fixed an out-of-bounds write in the MIDI implementation (bnc#1179601).\n- CVE-2020-27825: Fixed a race in the trace_open and buffer resize calls (bsc#1179960).\n- CVE-2020-29371: Fixed uninitialized memory leaks to userspace (bsc#1179429).\n- CVE-2020-29660: Fixed a locking inconsistency in the tty subsystem that may have allowed a read-after-free attack against TIOCGSID (bnc#1179745).\n- CVE-2020-29661: Fixed a locking issue in the tty subsystem that allowed a use-after-free attack against TIOCSPGRP (bsc#1179745).\n- CVE-2020-28974: Fixed a slab-out-of-bounds read in fbcon which could have been used by local attackers to read privileged information or potentially crash the kernel (bsc#1178589).\n- CVE-2020-28915: Fixed a buffer over-read in the fbcon code which could have been used by local attackers to read kernel memory (bsc#1178886).\n- CVE-2020-25669: Fixed a use-after-free read in sunkbd_reinit() (bsc#1178182).\n- CVE-2020-15437: Fixed a null pointer dereference which could have allowed local users to cause a denial of service(bsc#1179140).\n- CVE-2020-36158: Fixed a potential remote code execution in the Marvell mwifiex driver (bsc#1180559).\n- CVE-2020-28374: Fixed a Linux SCSI target issue (bsc#1178372).\n- CVE-2019-20934: Fixed a use-after-free in show_numa_stats() because NUMA fault statistics were inappropriately freed (bsc#1179663).\n\nThe following non-security bugs were fixed:\n\n- blk-mq: improve heavily contended tag case (bsc#1178198).\n- debugfs_lookup(): switch to lookup_one_len_unlocked() (bsc#1171979).\n- epoll: Keep a reference on files added to the check list (bsc#1180031).\n- fix regression in 'epoll: Keep a reference on files added to the check list' (bsc#1180031, git-fixes).\n- futex: Do not enable IRQs unconditionally in put_pi_state() (bsc#1149032).\n- futex: Ensure the correct return value from futex_lock_pi() (bsc#1181349 bsc#1149032).\n- futex: Fix incorrect should_fail_futex() handling (bsc#1181349).\n- futex: Handle faults correctly for PI futexes (bsc#1181349 bsc#1149032).\n- futex: Provide and use pi_state_update_owner() (bsc#1181349 bsc#1149032).\n- futex: Replace pointless printk in fixup_owner() (bsc#1181349 bsc#1149032).\n- futex: Simplify fixup_pi_state_owner() (bsc#1181349 bsc#1149032).\n- futex: Use pi_state_update_owner() in put_pi_state() (bsc#1181349 bsc#1149032).\n- HID: Fix slab-out-of-bounds read in hid_field_extract (bsc#1180052).\n- iommu/vt-d: Do not dereference iommu_device if IOMMU_API is not built (bsc#1181001, jsc#ECO-3191).\n- iommu/vt-d: Gracefully handle DMAR units with no supported address widths (bsc#1181001, jsc#ECO-3191).\n- kABI: Fix kABI for extended APIC-ID support (bsc#1181001, jsc#ECO-3191).\n- locking/futex: Allow low-level atomic operations to return -EAGAIN (bsc#1149032).\n- md/bitmap: fix memory leak of temporary bitmap (bsc#1163727).\n- md/bitmap: md_bitmap_get_counter returns wrong blocks (bsc#1163727).\n- md/bitmap: md_bitmap_read_sb uses wrong bitmap blocks (bsc#1163727).\n- md/cluster: block reshape with remote resync job (bsc#1163727).\n- md/cluster: fix deadlock when node is doing resync job (bsc#1163727).\n- md-cluster: Fix potential error pointer dereference in resize_bitmaps() (bsc#1163727).\n- md-cluster: fix rmmod issue when md_cluster convert bitmap to none (bsc#1163727).\n- md-cluster: fix safemode_delay value when converting to clustered bitmap (bsc#1163727).\n- md-cluster: fix wild pointer of unlock_all_bitmaps() (bsc#1163727).\n- Move upstreamed bt fixes into sorted section\n- nbd: Fix memory leak in nbd_add_socket (bsc#1181504).\n- net/x25: prevent a couple of overflows (bsc#1178590).\n- NFS: mark nfsiod as CPU_INTENSIVE (bsc#1177304).\n- rtmutex: Remove unused argument from rt_mutex_proxy_unlock() (bsc#1181349 bsc#1149032).\n- s390/dasd: fix hanging device offline processing (bsc#1144912).\n- scsi: ibmvfc: Avoid link down on FS9100 canister reboot (bsc#1176962 ltc#188304).\n- scsi: ibmvfc: Use compiler attribute defines instead of __attribute__() (bsc#1176962 ltc#188304).\n- SUNRPC: cache: ignore timestamp written to 'flush' file (bsc#1178036).\n- x86/apic: Fix x2apic enablement without interrupt remapping (bsc#1181001, jsc#ECO-3191).\n- x86/apic: Support 15 bits of APIC ID in IOAPIC/MSI where available (bsc#1181001, jsc#ECO-3191).\n- x86/ioapic: Handle Extended Destination ID field in RTE (bsc#1181001, jsc#ECO-3191).\n- x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID (bsc#1181001, jsc#ECO-3191).\n- x86/kvm: Reserve KVM_FEATURE_MSI_EXT_DEST_ID (bsc#1181001, jsc#ECO-3191).\n- x86/msi: Only use high bits of MSI address for DMAR unit (bsc#1181001, jsc#ECO-3191).\n- x86/tracing: Introduce a static key for exception tracing (bsc#1179895).\n- x86/traps: Simplify pagefault tracing logic (bsc#1179895).\n- xfrm: Fix memleak on xfrm state destroy (bsc#1158775).\n","modified":"2026-03-11T07:16:12.682512Z","published":"2021-02-11T08:49:30Z","related":["CVE-2019-20934","CVE-2020-0444","CVE-2020-0465","CVE-2020-0466","CVE-2020-15436","CVE-2020-15437","CVE-2020-25211","CVE-2020-25639","CVE-2020-25669","CVE-2020-27068","CVE-2020-27777","CVE-2020-27786","CVE-2020-27825","CVE-2020-27835","CVE-2020-28374","CVE-2020-28915","CVE-2020-28974","CVE-2020-29371","CVE-2020-29568","CVE-2020-29569","CVE-2020-29660","CVE-2020-29661","CVE-2020-36158","CVE-2020-4788","CVE-2021-3347","CVE-2021-3348"],"upstream":["CVE-2019-20934","CVE-2020-0444","CVE-2020-0465","CVE-2020-0466","CVE-2020-15436","CVE-2020-15437","CVE-2020-25211","CVE-2020-25639","CVE-2020-25669","CVE-2020-27068","CVE-2020-27777","CVE-2020-27786","CVE-2020-27825","CVE-2020-27835","CVE-2020-28374","CVE-2020-28915","CVE-2020-28974","CVE-2020-29371","CVE-2020-29568","CVE-2020-29569","CVE-2020-29660","CVE-2020-29661","CVE-2020-36158","CVE-2020-4788","CVE-2021-3347","CVE-2021-3348"],"references":[{"type":"ADVISORY","url":"https://www.suse.com/support/update/announcement/2021/suse-su-20210434-1/"},{"type":"REPORT","url":"https://bugzilla.suse.com/1144912"},{"type":"REPORT","url":"https://bugzilla.suse.com/1149032"},{"type":"REPORT","url":"https://bugzilla.suse.com/1158775"},{"type":"REPORT","url":"https://bugzilla.suse.com/1163727"},{"type":"REPORT","url":"https://bugzilla.suse.com/1171979"},{"type":"REPORT","url":"https://bugzilla.suse.com/1176395"},{"type":"REPORT","url":"https://bugzilla.suse.com/1176846"},{"type":"REPORT","url":"https://bugzilla.suse.com/1176962"},{"type":"REPORT","url":"https://bugzilla.suse.com/1177304"},{"type":"REPORT","url":"https://bugzilla.suse.com/1177666"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178036"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178182"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178198"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178372"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178589"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178590"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178684"},{"type":"REPORT","url":"https://bugzilla.suse.com/1178886"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179107"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179140"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179141"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179419"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179429"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179508"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179509"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179601"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179616"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179663"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179666"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179745"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179877"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179878"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179895"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179960"},{"type":"REPORT","url":"https://bugzilla.suse.com/1179961"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180008"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180027"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180028"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180029"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180030"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180031"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180032"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180052"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180086"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180559"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180562"},{"type":"REPORT","url":"https://bugzilla.suse.com/1180676"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181001"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181158"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181349"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181504"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181553"},{"type":"REPORT","url":"https://bugzilla.suse.com/1181645"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2019-20934"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-0444"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-0465"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-0466"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-15436"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-15437"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-25211"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-25639"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-25669"},{"type":"WEB","url":"https://www.suse.com/security/cve/CVE-2020-2706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