🛡️ SUSE-SU-2021:3877-1 — kernel-default (CVE-2021-0941 +3 more)

Security update for the Linux Kernel

The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• Unprivileged BPF has been disabled by default to reduce attack surface as too many security issues have happened in the past (jsc#SLE-22573)

You can reenable via systemctl setting /proc/sys/kernel/unprivileged_bpf_disabled to 0. (kernel.unprivileged_bpf_disabled = 0)

• CVE-2021-0941: In bpf_skb_change_head of filter.c, there is a possible out of bounds read due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation (bnc#1192045).
• CVE-2021-31916: An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module in the Linux kernel A bound check failure allowed an attacker with special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability (bnc#1192781).
• CVE-2021-20322: Make the ipv4 and ipv6 ICMP exception caches less predictive to avoid information leaks about UDP ports in use. (bsc#1191790)
• CVE-2021-34981: Fixed file refcounting in cmtp when cmtp_attach_device fails. (bsc#1191961)

The following non-security bugs were fixed:

• arm64: pgtable: make __pte_to_phys/__phys_to_pte_val inline functions (git-fixes).
• arm64/sve: Use correct size when reinitialising SVE state (git-fixes).
• bpf: Add kconfig knob for disabling unpriv bpf by default (jsc#SLE-22913)
• bpf: Disallow unprivileged bpf by default (jsc#SLE-22913).
• bpf: Fix potential race in tail call compatibility check (git-fixes).
• bpf: Move owner type, jited info into array auxiliary data (bsc#1141655).
• bpf: Use kvmalloc for map values in syscall (stable-5.14.16).
• btrfs: fix memory ordering between normal and ordered work functions (git-fixes).
• config: disable unprivileged BPF by default (jsc#SLE-22913)
• drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() (git-fixes).
• drm: fix spectre issue in vmw_execbuf_ioctl (bsc#1192802).
• EDAC/sb_edac: Fix top-of-high-memory value for Broadwell/Haswell (bsc#1114648).
• fuse: fix page stealing (bsc#1192718).
• gigaset: fix spectre issue in do_data_b3_req (bsc#1192802).
• hisax: fix spectre issues (bsc#1192802).
• hysdn: fix spectre issue in hycapi_send_message (bsc#1192802).
• i2c: synquacer: fix deferred probing (git-fixes).
• ibmvnic: check failover_pending in login response (bsc#1190523 ltc#194510).
• ibmvnic: do not stop queue in xmit (bsc#1192273 ltc#194629).
• ibmvnic: Process crqs after enabling interrupts (bsc#1192273 ltc#194629).
• infiniband: fix spectre issue in ib_uverbs_write (bsc#1192802).
• iwlwifi: fix spectre issue in iwl_dbgfs_update_pm (bsc#1192802).
• media: dvb_ca_en50221: prevent using slot_info for Spectre attacs (bsc#1192802).
• media: dvb_ca_en50221: sanity check slot number from userspace (bsc#1192802).
• media: wl128x: get rid of a potential spectre issue (bsc#1192802).
• mm/hugetlb: initialize hugetlb_usage in mm_init (bsc#1192906).
• mpt3sas: fix spectre issues (bsc#1192802).
• net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd() (bsc#1192802).
• osst: fix spectre issue in osst_verify_frame (bsc#1192802).
• prctl: allow to setup brk for et_dyn executables (git-fixes).
• printk/console: Allow to disable console output by using console='' or console=null (bsc#1192753).
• printk: handle blank console arguments passed in (bsc#1192753).
• printk: Remove printk.h inclusion in percpu.h (bsc#1192987).
• Revert 'ibmvnic: check failover_pending in login response' (bsc#1190523 ltc#194510).
• Revert 'x86/kvm: fix vcpu-id indexed array sizes' (git-fixes).
• scsi: be2iscsi: Fix an error handling path in beiscsi_dev_probe() (git-fixes).
• scsi: BusLogic: Fix missing pr_cont() use (git-fixes).
• scsi: core: Fix error handling of scsi_host_alloc() (git-fixes).
• scsi: core: Fix spelling in a source code comment (git-fixes).
• scsi: core: Only put parent device if host state differs from SHOST_CREATED (git-fixes).
• scsi: core: Put .shost_dev in failure path if host state changes to RUNNING (git-fixes).
• scsi: core: Retry I/O for Notify (Enable Spinup) Required error (git-fixes).
• scsi: csiostor: Add module softdep on cxgb4 (git-fixes).
• scsi: csiostor: Uninitialized data in csio_ln_vnp_read_cbfn() (git-fixes).
• scsi: dc395: Fix error case unwinding (git-fixes).
• scsi: FlashPoint: Rename si_flags field (git-fixes).
• scsi: iscsi: Fix iface sysfs attr detection (git-fixes).
• scsi: libsas: Use _safe() loop in sas_resume_port() (git-fixes).
• scsi: mpt3sas: Fix error return value in _scsih_expander_add() (git-fixes).
• scsi: qedf: Add pointer checks in qedf_update_link_speed() (git-fixes).
• scsi: qedf: Fix error codes in qedf_alloc_global_queues() (git-fixes).
• scsi: qe