In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock with fiemap and extent locking While working on the patchset to remove extent locking I got a lockdep splat with fiemap and pagefaulting with my new extent lock replacement lock. This deadlock exists with our normal code, we just don't have lockdep annotations with the extent locking so we've never noticed it. Since we're copying the fiemap extent to user space on every iteration we have the chance of pagefaulting. Because we hold the extent lock for the entire range we could mkwrite into a range in the file that we have mmap'ed. This would deadlock with the following stack trace [<0>] lock_extent+0x28d/0x2f0 [<0>] btrfs_page_mkwrite+0x273/0x8a0 [<0>] do_page_mkwrite+0x50/0xb0 [<0>] do_fault+0xc1/0x7b0 [<0>] __handle_mm_fault+0x2fa/0x460 [<0>] handle_mm_fault+0xa4/0x330 [<0>] do_user_addr_fault+0x1f4/0x800 [<0>] exc_page_fault+0x7c/0x1e0 [<0>] asm_exc_page_fault+0x26/0x30 [<0>] rep_movs_alternative+0x33/0x70 [<0>] _copy_to_user+0x49/0x70 [<0>] fiemap_fill_next_extent+0xc8/0x120 [<0>] emit_fiemap_extent+0x4d/0xa0 [<0>] extent_fiemap+0x7f8/0xad0 [<0>] btrfs_fiemap+0x49/0x80 [<0>] __x64_sys_ioctl+0x3e1/0xb50 [<0>] do_syscall_64+0x94/0x1a0 [<0>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 I wrote an fstest to reproduce this deadlock without my replacement lock and verified that the deadlock exists with our existing locking. To fix this simply don't take the extent lock for the entire duration of the fiemap. This is safe in general because we keep track of where we are when we're searching the tree, so if an ordered extent updates in the middle of our fiemap call we'll still emit the correct extents because we know what offset we were on before. The only place we maintain the lock is searching delalloc. Since the delalloc stuff can change during writeback we want to lock the extent range so we have a consistent view of delalloc at the time we're checking to see if we need to set the delalloc flag. With this patch applied we no longer deadlock with my testcase.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock with fiemap and
    extent locking While working on the patchset to remove extent locking I got a lockdep splat with fiemap
    and pagefaulting with my new extent lock replacement lock. This deadlock exists with our normal code, we
    just don't have lockdep annotations with the extent locking so we've never noticed it. Since we're copying
    the fiemap extent to user space on every iteration we have the chance of pagefaulting. Because we hold the
    extent lock for the entire range we could mkwrite into a range in the file that we have mmap'ed. This
    would deadlock with the following stack trace [<0>] lock_extent+0x28d/0x2f0 [<0>]
    btrfs_page_mkwrite+0x273/0x8a0 [<0>] do_page_mkwrite+0x50/0xb0 [<0>] do_fault+0xc1/0x7b0 [<0>]
    __handle_mm_fault+0x2fa/0x460 [<0>] handle_mm_fault+0xa4/0x330 [<0>] do_user_addr_fault+0x1f4/0x800 [<0>]
    exc_page_fault+0x7c/0x1e0 [<0>] asm_exc_page_fault+0x26/0x30 [<0>] rep_movs_alternative+0x33/0x70 [<0>]
    _copy_to_user+0x49/0x70 [<0>] fiemap_fill_next_extent+0xc8/0x120 [<0>] emit_fiemap_extent+0x4d/0xa0 [<0>]
    extent_fiemap+0x7f8/0xad0 [<0>] btrfs_fiemap+0x49/0x80 [<0>] __x64_sys_ioctl+0x3e1/0xb50 [<0>]
    do_syscall_64+0x94/0x1a0 [<0>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 I wrote an fstest to reproduce
    this deadlock without my replacement lock and verified that the deadlock exists with our existing locking.
    To fix this simply don't take the extent lock for the entire duration of the fiemap. This is safe in
    general because we keep track of where we are when we're searching the tree, so if an ordered extent
    updates in the middle of our fiemap call we'll still emit the correct extents because we know what offset
    we were on before. The only place we maintain the lock is searching delalloc. Since the delalloc stuff can
    change during writeback we want to lock the extent range so we have a consistent view of delalloc at the
    time we're checking to see if we need to set the delalloc flag. With this patch applied we no longer
    deadlock with my testcase. (CVE-2024-35784)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - btrfs: fix deadlock with fiemap and extent locking While working on the patchset to remove extent locking     I got a lockdep splat with fiemap and pagefaulting with my new extent lock replacement lock. This deadlock     exists with our normal code, we just don't have lockdep annotations with the extent locking so we've never     noticed it. Since we're copying the fiemap extent to user space on every iteration we have the chance of     pagefaulting. Because we hold the extent lock for the entire range we could mkwrite into a range in the     file that we have mmap'ed. This would deadlock with the following stack trace [<0>]     lock_extent+0x28d/0x2f0 [<0>] btrfs_page_mkwrite+0x273/0x8a0 [<0>] do_page_mkwrite+0x50/0xb0 [<0>]     do_fault+0xc1/0x7b0 [<0>] __handle_mm_fault+0x2fa/0x460 [<0>] handle_mm_fault+0xa4/0x330 [<0>]     do_user_addr_fault+0x1f4/0x800 [<0>] exc_page_fault+0x7c/0x1e0 [<0>] asm_exc_page_fault+0x26/0x30 [<0>]     rep_movs_alternative+0x33/0x70 [<0>] _copy_to_user+0x49/0x70 [<0>] fiemap_fill_next_extent+0xc8/0x120     [<0>] emit_fiemap_extent+0x4d/0xa0 [<0>] extent_fiemap+0x7f8/0xad0 [<0>] btrfs_fiemap+0x49/0x80 [<0>]
    __x64_sys_ioctl+0x3e1/0xb50 [<0>] do_syscall_64+0x94/0x1a0 [<0>] entry_SYSCALL_64_after_hwframe+0x6e/0x76     I wrote an fstest to reproduce this deadlock without my replacement lock and verified that the deadlock     exists with our existing locking. To fix this simply don't take the extent lock for the entire duration of     the fiemap. This is safe in general because we keep track of where we are when we're searching the tree,     so if an ordered extent updates in the middle of our fiemap call we'll still emit the correct extents     because we know what offset we were on before. The only place we maintain the lock is searching delalloc.
    Since the delalloc stuff can change during writeback we want to lock the extent range so we have a     consistent view of delalloc at the time we're checking to see if we need to set the delalloc flag. With     this patch applied we no longer deadlock with my testcase. (CVE-2024-35784)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote SUSE Linux SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:2135-1 advisory.

    The SUSE Linux Enterprise 15 SP6 Azure kernel was updated to receive various security bugfixes.

    The following security bugs were fixed:

    - CVE-2024-22099: Fixed a null-pointer-dereference in rfcomm_check_security (bsc#1219170).
    - CVE-2024-26764: Fixed IOCB_AIO_RW check in fs/aio before the struct aio_kiocb conversion (bsc#1222721).
    - CVE-2024-26862: Fixed packet annotate data-races around ignore_outgoing (bsc#1223111).
    - CVE-2024-26673: Fixed netfilter/nft_ct layer 3 and 4 protocol sanitization (bsc#1222368).
    - CVE-2023-0160: Fixed deadlock flaw in BPF that could allow a local user to potentially crash the system     (bsc#1209657).
    - CVE-2024-26993: Fixed fs/sysfs reference leak in sysfs_break_active_protection() (bsc#1223693).
    - CVE-2024-27013: Fixed tun limit printing rate when illegal packet received by tun device (bsc#1223745).
    - CVE-2024-27014: Fixed net/mlx5e to prevent deadlock while disabling aRFS (bsc#1223735).
    - CVE-2024-26948: Fixed drm/amd/display by adding dc_state NULL check in dc_state_release (bsc#1223664).
    - CVE-2024-27056: Fixed wifi/iwlwifi/mvm to ensure offloading TID queue exists (bsc#1223822).
    - CVE-2024-26960: Fixed mm/swap race between free_swap_and_cache() and swapoff() (bsc#1223655).
    - CVE-2023-52652: Fixed NTB for possible name leak in ntb_register_device() (bsc#1223686).
    - CVE-2024-23848: Fixed media/cec for possible use-after-free in cec_queue_msg_fh (bsc#1219104).
    - CVE-2024-26982: Fixed Squashfs inode number check not to be an invalid value of zero (bsc#1223634).
    - CVE-2024-26878: Fixed quota for potential NULL pointer dereference (bsc#1223060).
    - CVE-2024-26901: Fixed do_sys_name_to_handle() to use kzalloc() to prevent kernel-infoleak (bsc#1223198).
    - CVE-2024-26671: Fixed blk-mq IO hang from sbitmap wakeup race (bsc#1222357).
    - CVE-2024-26772: Fixed ext4 to avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()     (bsc#1222613).
    - CVE-2024-26906: Disallowed vsyscall page read for copy_from_kernel_nofault() (bsc#1223202).
    - CVE-2024-26816: Ignore relocations in .notes section when building with CONFIG_XEN_PV=y (bsc#1222624).
    - CVE-2024-26783: Fixed mm/vmscan bug when calling wakeup_kswapd() with a wrong zone index (bsc#1222615).
    - CVE-2024-26883: Fixed bpf stackmap overflow check on 32-bit arches (bsc#1223035).
    - CVE-2024-26884: Fixed bpf hashtab overflow check on 32-bit arches (bsc#1223189).
    - CVE-2024-26885: Fixed bpf DEVMAP_HASH overflow check on 32-bit arches (bsc#1223190).
    - CVE-2024-26882: Fixed net/ip_tunnel to make sure to pull inner header in ip_tunnel_rcv() (bsc#1223034).
    - CVE-2023-52645: Fixed pmdomain/mediatek race conditions with genpd (bsc#1223033).
    - CVE-2024-26836: Fixed platform/x86/think-lmi password opcode ordering for workstations (bsc#1222968).
    - CVE-2024-26601: Fixed ext4 buddy bitmap corruption via fast commit replay (bsc#1220342).
    - CVE-2024-26773: Fixed ext4 block allocation from corrupted group in ext4_mb_try_best_found()     (bsc#1222618).
    - CVE-2024-26807: Fixed spi/cadence-qspi NULL pointer reference in runtime PM hooks (bsc#1222801).
    - CVE-2024-26737: Fixed selftests/bpf racing between bpf_timer_cancel_and_free and bpf_timer_cancel     (bsc#1222557).
    - CVE-2024-26733: Fixed an overflow in arp_req_get() in arp (bsc#1222585).
    - CVE-2024-26684: Fixed net/stmmac/xgmac handling of DPP safety error for DMA channels (bsc#1222445).
    - CVE-2024-26704: Fixed a double-free of blocks due to wrong extents moved_len in ext4 (bsc#1222422).
    - CVE-2023-52591: Fixed a possible reiserfs filesystem corruption via directory renaming (bsc#1221044).
    - CVE-2023-52503: Fixed tee/amdtee use-after-free vulnerability in amdtee_close_session (bsc#1220915).
    - CVE-2024-26642: Fixed the set of anonymous timeout flag in netfilter nf_tables (bsc#1221830).
    - CVE-2024-26614: Fixed the initialization of accept_queue's spinlocks (bsc#1221293).
    - CVE-2024-25739: Fixed possible crash in create_empty_lvol() in drivers/mtd/ubi/vtbl.c (bsc#1219834).
    - CVE-2023-6270: Fixed a use-after-free issue in aoecmd_cfg_pkts (bsc#1218562).
    - CVE-2024-36030: Fix the double free in rvu_npc_freemem() (bsc#1225712)
    - CVE-2023-52698: Fix memory leak in netlbl_calipso_add_pass() (bsc#1224621)
    - CVE-2024-26860: Fix a memory leak when rechecking the data (bsc#1223077).
    - CVE-2023-52772: Fix use-after-free in unix_stream_read_actor() (bsc#1224989).
    - CVE-2024-27431: Zero-initialise xdp_rxq_info struct before running XDP program (bsc#1224718).
    - CVE-2024-35860: Support deferring bpf_link dealloc to after RCU grace period BPF link for some program     types (bsc#1224531).
    - CVE-2024-35964: Fix not validating setsockopt user input Check user input length before copying data     (bsc#1224581).
    - CVE-2023-0160: Prevent lock inversion deadlock in map delete elem  (bsc#1209657).
    - CVE-2024-35903: Fix IP after emitting call depth accounting Adjust the IP passed to `emit_patch` so it     calculates the correct offset for the CALL instruction if `x86_call_depth_emit_accounting` emits code     (bsc#1224493).
    - CVE-2024-35931: Skip do PCI error slot reset during RAS recovery (bsc#1224652).
    - CVE-2024-35877: Fix VM_PAT handling in COW mappings (bsc#1224525).
    - CVE-2024-35969: Fix race condition between ipv6_get_ifaddr and ipv6_del_addr (bsc#1224580)
    - CVE-2024-35852: Fix memory leak when canceling rehash work The rehash delayed work is rescheduled with a     delay if the number of credits at end of the work is not negative as supposedly it means that the     migration ended (bsc#1224502).
    - CVE-2024-36006: Fix incorrect list API usage (bsc#1224541).
    - CVE-2024-36007: Fix warning during rehash (bsc#1224543).
    - CVE-2024-35872: Fix GUP-fast succeeding on secretmem folios (bsc#1224530).
    - CVE-2024-35956: Fix qgroup prealloc rsv leak in subvolume operations (bsc#1224674)
    - CVE-2023-52771: Fix delete_endpoint() vs parent unregistration race  (bsc#1225007).
    - CVE-2024-27408: Add sync read before starting the  DMA transfer in remote setup (bsc#1224430).
    - CVE-2024-35943: Add a null pointer check to the omap_prm_domain_init devm_kasprintf()returns a pointer     to dynamically allocated memory which can be NULL upon failure (bsc#1224649).
    - CVE-2024-35921: Fix oops when HEVC init fails (bsc#1224477).
    - CVE-2023-52860: Use cpuhp_state_remove_instance_nocalls() for hisi_hns3_pmu uninit process     (bsc#1224936).
    - CVE-2024-35991: kABI workaround for struct idxd_evl (bsc#1224553).
    - CVE-2024-35854: Fix possible use-after-free during rehash (bsc#1224636).
    - CVE-2024-27418: Take ownership of skb in mctp_local_output (bsc#1224720)
    - CVE-2024-27417: Fix potential 'struct net' leak in inet6_rtm_getaddr() (bsc#1224721).
    - CVE-2024-35905: Protect against int overflow for stack access size (bsc#1224488).
    - CVE-2024-35917: Fix bpf_plt pointer arithmetic (bsc#1224481).
    - CVE-2023-52674: Add clamp() in scarlett2_mixer_ctl_put() to nsure the value passed to     scarlett2_mixer_ctl_put() is between 0 and SCARLETT2_MIXER_MAX_VALUE so we don't attempt to access outside     scarlett2_mixer_values[] (bsc#1224727).
    - CVE-2023-52680: Add missing error checks to *_ctl_get() because the *_ctl_get() functions which call     scarlett2_update_*() were not checking the return value (bsc#1224608).
    - CVE-2023-52692: Add missing error check to scarlett2_usb_set_config() scarlett2_usb_set_config() calls     scarlett2_usb_get() but was not checking the result (bsc#1224628).
    - CVE-2024-35944: Fix memcpy() run-time warning in dg_dispatch_as_host() Syzkaller hit 'WARNING in     dg_dispatch_as_host' bug (bsc#1224648).
    - CVE-2024-26923: Suppress false-positive lockdep splat for spin_lock()  in __unix_gc() (bsc#1223384).
    - CVE-2023-52659: Ensure input to pfn_to_kaddr() is treated as a 64-bit type (bsc#1224442).
    - CVE-2024-21823: Hardware logic with insecure de-synchronization in Intel(R) DSA and Intel(R) IAA for     some Intel(R) 4th or 5th generation Xeon(R) processors may have allowed an authorized user to potentially     enable denial of service via local access (bsc#1223625).
    - CVE-2024-26828: Fix underflow in parse_server_interfaces() (bsc#1223084).
    - CVE-2024-27395: Fix Use-After-Free in ovs_ct_exit Since kfree_rcu (bsc#1224098).
    - CVE-2023-52483: Perform route lookups under a RCU read-side lock (bsc#1220738).
    - CVE-2024-27396: Fix Use-After-Free in gtp_dellink (bsc#1224096).
    - CVE-2024-26632: Fix iterating over an empty bio with  bio_for_each_folio_all (bsc#1221635).
    - CVE-2024-27401: Ensure that packet_buffer_get respects the user_length provided. (bsc#1224181).
    - CVE-2024-26775: Avoid potential deadlock at set_capacity (bsc#1222627).
    - CVE-2024-26958: Fix UAF in direct writes (bsc#1223653).
    - CVE-2024-26643: Mark set as dead when unbinding anonymous set with timeout While the rhashtable set gc     runs asynchronously, a race allowed it to collect elements from anonymous sets with timeouts while it is     being released from the commit path. (bsc#1221829).
    - CVE-2023-52618: Check for unlikely string overflow (bsc#1221615).
    - CVE-2023-6238: Only privileged user could specify a small meta buffer and let the device perform larger     Direct Memory Access (DMA) into the same buffer, overwriting unrelated kernel memory, causing random     kernel crashes and memory corruption (bsc#1217384).
    - CVE-2024-26946: Use copy_from_kernel_nofault() to read from unsafe address Read from an unsafe address     with copy_from_kernel_nofault() in arch_adjust_kprobe_addr() because this function is used before checking     the address is in text or not (bsc#1223669).
    - CVE-2024-26945: Fix nr_cpus nr_iaa case If nr_cpus nr_iaa, the calculated cpus_per_iaa will be 0, which     causes a divide-by-0 in rebalance_wq_table() (bsc#1223732).
    - CVE-2024-26679: Read sk->sk_family once in inet_recv_error() inet_recv_error() is called without holding     the socket lock. IPv6 socket could mutate to IPv4 with IPV6_ADDRFORM socket option and trigger a KCSAN     warning (bsc#1222385).
    - CVE-2024-26791: Properly validate device names (bsc#1222793)
    - CVE-2023-52641: Add NULL ptr dereference checking at the end of attr_allocate_frame() (bsc#1222303)
    - CVE-2024-26726: Do not drop extent_map for free space inode on write error (bsc#1222532)
    - CVE-2024-27022: Defer linking file vma until vma is fully initialized (bsc#1223774).
    - CVE-2024-26899: Fix deadlock between bd_link_disk_holder and partition scan (bsc#1223045).
    - CVE-2024-26638: Always initialize struct msghdr completely (bsc#1221649).
    - CVE-2024-26909: Fix drm bridge use-after-free A recent DRM series purporting to simplify support     (bsc#1223143).
    - CVE-2024-26674: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups (bsc#1222378).
    - CVE-2024-26832: Fix missing folio cleanup in writeback race path (bsc#1223007).
    - CVE-2024-26844: Fix WARNING in _copy_from_iter (bsc#1223015).
    - CVE-2024-26774: Avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt     (bsc#1222622).
    - CVE-2024-26815: Properly check TCA_TAPRIO_TC_ENTRY_INDEX (bsc#1222635).
    - cve-2024-267600: Fix bio_put() for error case (bsc#1222596).
    - CVE-2024-26731: Fix NULL pointer dereference in sk_psock_verdict_data_ready() (bsc#1222371).
    - CVE-2024-26740: Use the backlog for mirred ingress (bsc#1222563).
    - CVE-2023-52640: Fix oob in ntfs_listxattr The length of name cannot exceed the space occupied by ea     (bsc#1222301).
    - CVE-2023-52631: Fix a NULL dereference bug (bsc#1222264).
    - CVE-2023-52458: Add check that partition length needs to be aligned  with block size (bsc#1220428).
    - CVE-2023-6270: Fix the potential use-after-free problem in aoecmd_cfg_pkts  (bsc#1218562).
    - CVE-2024-26805: Fix kernel-infoleak-after-free in __skb_datagram_iter (bsc#1222630).
    - CVE-2024-26991: Do not overflow lpage_info when checking attributes (bsc#1223695).

    - CVE-2024-26921: Preserve kabi for sk_buff (bsc#1223138).
    - CVE-2024-26925: Release mutex after nft_gc_seq_end from abort path (bsc#1223390).
    - CVE-2024-26822: Set correct id, uid and cruid for multiuser  automounts (bsc#1223011).
    - CVE-2023-52434: Fixed potential OOBs in smb2_parse_contexts()  (bsc#1220148).
    - CVE-2024-26928: Fixed potential UAF in cifs_debug_files_proc_show() (bsc#1223532).
    - CVE-2024-35999: Fixed missing lock when picking channel (bsc#1224550).
    - CVE-2024-35861: Fixed potential UAF in  cifs_signal_cifsd_for_reconnect() (bsc#1224766).
    - CVE-2024-35862: Fixed potential UAF in smb2_is_network_name_deleted()  (bsc#1224764).
    - CVE-2024-35863: Fixed potential UAF in is_valid_oplock_break() (bsc#1224763).
    - CVE-2024-35865: Fixed potential UAF in smb2_is_valid_oplock_break()  (bsc#1224668).
    - CVE-2024-35864: Fixed potential UAF in smb2_is_valid_lease_break()  (bsc#1224765).
    - CVE-2024-35867: Fixed potential UAF in cifs_stats_proc_show() (bsc#1224664).
    - CVE-2024-35868: Fixed potential UAF in cifs_stats_proc_write() (bsc#1224678).
    - CVE-2024-35866: Fixed potential UAF in cifs_dump_full_key()  (bsc#1224667).
    - CVE-2024-35869: Guarantee refcounted children from parent session  (bsc#1224679).
    - CVE-2024-35870: Fixed UAF in smb2_reconnect_server() (bsc#1224672).
    - CVE-2024-26692: Fixed regression in writes when non-standard maximum write  size negotiated     (bsc#1222464).
    - CVE-2024-27036: Fixed writeback data corruption (bsc#1223810).


Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
461254	Echo: linux: security update to 6.7.12-1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
461254	Echo: linux: security update to 6.7.12-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
239850	TencentOS Server 4: kernel (TSSA-2024:0980)	Nessus	Tencent Local Security Checks	Local	high
229563	Linux Distros Unpatched Vulnerability : CVE-2024-35784	Nessus	Misc.	Local	medium
206008	SUSE SLES15 Security Update : kernel (SUSE-SU-2024:2973-1)	Nessus	SuSE Local Security Checks	Local	high
200853	SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2024:2135-1)	Nessus	SuSE Local Security Checks	Local	high

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CVE-2024-35784

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