Message-ID: <2025121642-CVE-2025-68297-1f6e@gregkh>
Date: Tue, 16 Dec 2025 16:06:51 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68297: ceph: fix crash in process_v2_sparse_read() for encrypted directories

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

ceph: fix crash in process_v2_sparse_read() for encrypted directories

The crash in process_v2_sparse_read() for fscrypt-encrypted directories
has been reported. Issue takes place for Ceph msgr2 protocol in secure
mode. It can be reproduced by the steps:

sudo mount -t ceph :/ /mnt/cephfs/ -o name=admin,fs=cephfs,ms_mode=secure

(1) mkdir /mnt/cephfs/fscrypt-test-3
(2) cp area_decrypted.tar /mnt/cephfs/fscrypt-test-3
(3) fscrypt encrypt --source=raw_key --key=./my.key /mnt/cephfs/fscrypt-test-3
(4) fscrypt lock /mnt/cephfs/fscrypt-test-3
(5) fscrypt unlock --key=my.key /mnt/cephfs/fscrypt-test-3
(6) cat /mnt/cephfs/fscrypt-test-3/area_decrypted.tar
(7) Issue has been triggered

[  408.072247] ------------[ cut here ]------------
[  408.072251] WARNING: CPU: 1 PID: 392 at net/ceph/messenger_v2.c:865
ceph_con_v2_try_read+0x4b39/0x72f0
[  408.072267] Modules linked in: intel_rapl_msr intel_rapl_common
intel_uncore_frequency_common intel_pmc_core pmt_telemetry pmt_discovery
pmt_class intel_pmc_ssram_telemetry intel_vsec kvm_intel joydev kvm irqbypass
polyval_clmulni ghash_clmulni_intel aesni_intel rapl input_leds psmouse
serio_raw i2c_piix4 vga16fb bochs vgastate i2c_smbus floppy mac_hid qemu_fw_cfg
pata_acpi sch_fq_codel rbd msr parport_pc ppdev lp parport efi_pstore
[  408.072304] CPU: 1 UID: 0 PID: 392 Comm: kworker/1:3 Not tainted 6.17.0-rc7+
[  408.072307] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.17.0-5.fc42 04/01/2014
[  408.072310] Workqueue: ceph-msgr ceph_con_workfn
[  408.072314] RIP: 0010:ceph_con_v2_try_read+0x4b39/0x72f0
[  408.072317] Code: c7 c1 20 f0 d4 ae 50 31 d2 48 c7 c6 60 27 d5 ae 48 c7 c7 f8
8e 6f b0 68 60 38 d5 ae e8 00 47 61 fe 48 83 c4 18 e9 ac fc ff ff <0f> 0b e9 06
fe ff ff 4c 8b 9d 98 fd ff ff 0f 84 64 e7 ff ff 89 85
[  408.072319] RSP: 0018:ffff88811c3e7a30 EFLAGS: 00010246
[  408.072322] RAX: ffffed1024874c6f RBX: ffffea00042c2b40 RCX: 0000000000000f38
[  408.072324] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[  408.072325] RBP: ffff88811c3e7ca8 R08: 0000000000000000 R09: 00000000000000c8
[  408.072326] R10: 00000000000000c8 R11: 0000000000000000 R12: 00000000000000c8
[  408.072327] R13: dffffc0000000000 R14: ffff8881243a6030 R15: 0000000000003000
[  408.072329] FS:  0000000000000000(0000) GS:ffff88823eadf000(0000)
knlGS:0000000000000000
[  408.072331] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  408.072332] CR2: 000000c0003c6000 CR3: 000000010c106005 CR4: 0000000000772ef0
[  408.072336] PKRU: 55555554
[  408.072337] Call Trace:
[  408.072338]  <TASK>
[  408.072340]  ? sched_clock_noinstr+0x9/0x10
[  408.072344]  ? __pfx_ceph_con_v2_try_read+0x10/0x10
[  408.072347]  ? _raw_spin_unlock+0xe/0x40
[  408.072349]  ? finish_task_switch.isra.0+0x15d/0x830
[  408.072353]  ? __kasan_check_write+0x14/0x30
[  408.072357]  ? mutex_lock+0x84/0xe0
[  408.072359]  ? __pfx_mutex_lock+0x10/0x10
[  408.072361]  ceph_con_workfn+0x27e/0x10e0
[  408.072364]  ? metric_delayed_work+0x311/0x2c50
[  408.072367]  process_one_work+0x611/0xe20
[  408.072371]  ? __kasan_check_write+0x14/0x30
[  408.072373]  worker_thread+0x7e3/0x1580
[  408.072375]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[  408.072378]  ? __pfx_worker_thread+0x10/0x10
[  408.072381]  kthread+0x381/0x7a0
[  408.072383]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[  408.072385]  ? __pfx_kthread+0x10/0x10
[  408.072387]  ? __kasan_check_write+0x14/0x30
[  408.072389]  ? recalc_sigpending+0x160/0x220
[  408.072392]  ? _raw_spin_unlock_irq+0xe/0x50
[  408.072394]  ? calculate_sigpending+0x78/0xb0
[  408.072395]  ? __pfx_kthread+0x10/0x10
[  408.072397]  ret_from_fork+0x2b6/0x380
[  408.072400]  ? __pfx_kthread+0x10/0x10
[  408.072402]  ret_from_fork_asm+0x1a/0x30
[  408.072406]  </TASK>
[  408.072407] ---[ end trace 0000000000000000 ]---
[  408.072418] Oops: general protection fault, probably for non-canonical
address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
[  408.072984] KASAN: null-ptr-deref in range [0x0000000000000000-
0x0000000000000007]
[  408.073350] CPU: 1 UID: 0 PID: 392 Comm: kworker/1:3 Tainted: G        W
6.17.0-rc7+ #1 PREEMPT(voluntary)
[  408.073886] Tainted: [W]=WARN
[  408.074042] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.17.0-5.fc42 04/01/2014
[  408.074468] Workqueue: ceph-msgr ceph_con_workfn
[  408.074694] RIP: 0010:ceph_msg_data_advance+0x79/0x1a80
[  408.074976] Code: fc ff df 49 8d 77 08 48 c1 ee 03 80 3c 16 00 0f 85 07 11 00
00 48 ba 00 00 00 00 00 fc ff df 49 8b 5f 08 48 89 de 48 c1 ee 03 <0f> b6 14 16
84 d2 74 09 80 fa 03 0f 8e 0f 0e 00 00 8b 13 83 fa 03
[  408.075884] RSP: 0018:ffff88811c3e7990 EFLAGS: 00010246
[  408.076305] RAX: ffff8881243a6388 RBX: 0000000000000000 RCX: 0000000000000000
[  408.076909] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8881243a6378
[  408.077466] RBP: ffff88811c3e7a20 R08: 0000000000000000 R09: 00000000000000c8
[  408.078034] R10: ffff8881243a6388 R11: 0000000000000000 R12: ffffed1024874c71
[  408.078575] R13: dffffc0000000000 R14: ffff8881243a6030 R15: ffff8881243a6378
[  408.079159] FS:  0000000000000000(0000) GS:ffff88823eadf000(0000)
knlGS:0000000000000000
[  408.079736] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  408.080039] CR2: 000000c0003c6000 CR3: 000000010c106005 CR4: 0000000000772ef0
[  408.080376] PKRU: 55555554
[  408.080513] Call Trace:
[  408.080630]  <TASK>
[  408.080729]  ceph_con_v2_try_read+0x49b9/0x72f0
[  408.081115]  ? __pfx_ceph_con_v2_try_read+0x10/0x10
[  408.081348]  ? _raw_spin_unlock+0xe/0x40
[  408.081538]  ? finish_task_switch.isra.0+0x15d/0x830
[  408.081768]  ? __kasan_check_write+0x14/0x30
[  408.081986]  ? mutex_lock+0x84/0xe0
[  408.082160]  ? __pfx_mutex_lock+0x10/0x10
[  408.082343]  ceph_con_workfn+0x27e/0x10e0
[  408.082529]  ? metric_delayed_work+0x311/0x2c50
[  408.082737]  process_one_work+0x611/0xe20
[  408.082948]  ? __kasan_check_write+0x14/0x30
[  408.083156]  worker_thread+0x7e3/0x1580
[  408.083331]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[  408.083557]  ? __pfx_worker_thread+0x10/0x10
[  408.083751]  kthread+0x381/0x7a0
[  408.083922]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[  408.084139]  ? __pfx_kthread+0x10/0x10
[  408.084310]  ? __kasan_check_write+0x14/0x30
[  408.084510]  ? recalc_sigpending+0x160/0x220
[  408.084708]  ? _raw_spin_unlock_irq+0xe/0x50
[  408.084917]  ? calculate_sigpending+0x78/0xb0
[  408.085138]  ? __pfx_kthread+0x10/0x10
[  408.085335]  ret_from_fork+0x2b6/0x380
[  408.085525]  ? __pfx_kthread+0x10/0x10
[  408.085720]  ret_from_fork_asm+0x1a/0x30
[  408.085922]  </TASK>
[  408.086036] Modules linked in: intel_rapl_msr intel_rapl_common
intel_uncore_frequency_common intel_pmc_core pmt_telemetry pmt_discovery
pmt_class intel_pmc_ssram_telemetry intel_vsec kvm_intel joydev kvm irqbypass
polyval_clmulni ghash_clmulni_intel aesni_intel rapl input_leds psmouse
serio_raw i2c_piix4 vga16fb bochs vgastate i2c_smbus floppy mac_hid qemu_fw_cfg
pata_acpi sch_fq_codel rbd msr parport_pc ppdev lp parport efi_pstore
[  408.087778] ---[ end trace 0000000000000000 ]---
[  408.088007] RIP: 0010:ceph_msg_data_advance+0x79/0x1a80
[  408.088260] Code: fc ff df 49 8d 77 08 48 c1 ee 03 80 3c 16 00 0f 85 07 11 00
00 48 ba 00 00 00 00 00 fc ff df 49 8b 5f 08 48 89 de 48 c1 ee 03 <0f> b6 14 16
84 d2 74 09 80 fa 03 0f 8e 0f 0e 00 00 8b 13 83 fa 03
[  408.089118] RSP: 0018:ffff88811c3e7990 EFLAGS: 00010246
[  408.089357] RAX: ffff8881243a6388 RBX: 0000000000000000 RCX: 0000000000000000
[  408.089678] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8881243a6378
[  408.090020] RBP: ffff88811c3e7a20 R08: 0000000000000000 R09: 00000000000000c8
[  408.090360] R10: ffff8881243a6388 R11: 0000000000000000 R12: ffffed1024874c71
[  408.090687] R13: dffffc0000000000 R14: ffff8881243a6030 R15: ffff8881243a6378
[  408.091035] FS:  0000000000000000(0000) GS:ffff88823eadf000(0000)
knlGS:0000000000000000
[  408.091452] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  408.092015] CR2: 000000c0003c6000 CR3: 000000010c106005 CR4: 0000000000772ef0
[  408.092530] PKRU: 55555554
[  417.112915]
==================================================================
[  417.113491] BUG: KASAN: slab-use-after-free in
__mutex_lock.constprop.0+0x1522/0x1610
[  417.114014] Read of size 4 at addr ffff888124870034 by task kworker/2:0/4951

[  417.114587] CPU: 2 UID: 0 PID: 4951 Comm: kworker/2:0 Tainted: G      D W
6.17.0-rc7+ #1 PREEMPT(voluntary)
[  417.114592] Tainted: [D]=DIE, [W]=WARN
[  417.114593] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.17.0-5.fc42 04/01/2014
[  417.114596] Workqueue: events handle_timeout
[  417.114601] Call Trace:
[  417.114602]  <TASK>
[  417.114604]  dump_stack_lvl+0x5c/0x90
[  417.114610]  print_report+0x171/0x4dc
[  417.114613]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[  417.114617]  ? kasan_complete_mode_report_info+0x80/0x220
[  417.114621]  kasan_report+0xbd/0x100
[  417.114625]  ? __mutex_lock.constprop.0+0x1522/0x1610
[  417.114628]  ? __mutex_lock.constprop.0+0x1522/0x1610
[  417.114630]  __asan_report_load4_noabort+0x14/0x30
[  417.114633]  __mutex_lock.constprop.0+0x1522/0x1610
[  417.114635]  ? queue_con_delay+0x8d/0x200
[  417.114638]  ? __pfx___mutex_lock.constprop.0+0x10/0x10
[  417.114641]  ? __send_subscribe+0x529/0xb20
[  417.114644]  __mutex_lock_slowpath+0x13/0x20
[  417.114646]  mutex_lock+0xd4/0xe0
[  417.114649]  ? __pfx_mutex_lock+0x10/0x10
[  417.114652]  ? ceph_monc_renew_subs+0x2a/0x40
[  417.114654]  ceph_con_keepalive+0x22/0x110
[  417.114656]  handle_timeout+0x6b3/0x11d0
[  417.114659]  ? _raw_spin_unlock_irq+0xe/0x50
[  417.114662]  ? __pfx_handle_timeout+0x10/0x10
[  417.114664]  ? queue_delayed_work_on+0x8e/0xa0
[  417.114669]  process_one_work+0x611/0xe20
[  417.114672]  ? __kasan_check_write+0x14/0x30
[  417.114676]  worker_thread+0x7e3/0x1580
[  417.114678]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[  417.114682]  ? __pfx_sched_setscheduler_nocheck+0x10/0x10
[  417.114687]  ? __pfx_worker_thread+0x10/0x10
[  417.114689]  kthread+0x381/0x7a0
[  417.114692]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[  417.114694]  ? __pfx_kthread+0x10/0x10
[  417.114697]  ? __kasan_check_write+0x14/0x30
[  417.114699]  ? recalc_sigpending+0x160/0x220
[  417.114703]  ? _raw_spin_unlock_irq+0xe/0x50
[  417.114705]  ? calculate_sigpending+0x78/0xb0
[  417.114707]  ? __pfx_kthread+0x10/0x10
[  417.114710]  ret_from_fork+0x2b6/0x380
[  417.114713]  ? __pfx_kthread+0x10/0x10
[  417.114715]  ret_from_fork_asm+0x1a/0x30
[  417.114720]  </TASK>

[  417.125171] Allocated by task 2:
[  417.125333]  kasan_save_stack+0x26/0x60
[  417.125522]  kasan_save_track+0x14/0x40
[  417.125742]  kasan_save_alloc_info+0x39/0x60
[  417.125945]  __kasan_slab_alloc+0x8b/0xb0
[  417.126133]  kmem_cache_alloc_node_noprof+0x13b/0x460
[  417.126381]  copy_process+0x320/0x6250
[  417.126595]  kernel_clone+0xb7/0x840
[  417.126792]  kernel_thread+0xd6/0x120
[  417.126995]  kthreadd+0x85c/0xbe0
[  417.127176]  ret_from_fork+0x2b6/0x380
[  417.127378]  ret_from_fork_asm+0x1a/0x30

[  417.127692] Freed by task 0:
[  417.127851]  kasan_save_stack+0x26/0x60
[  417.128057]  kasan_save_track+0x14/0x40
[  417.128267]  kasan_save_free_info+0x3b/0x60
[  417.128491]  __kasan_slab_free+0x6c/0xa0
[  417.128708]  kmem_cache_free+0x182/0x550
[  417.128906]  free_task+0xeb/0x140
[  417.129070]  __put_task_struct+0x1d2/0x4f0
[  417.129259]  __put_task_struct_rcu_cb+0x15/0x20
[  417.129480]  rcu_do_batch+0x3d3/0xe70
[  417.129681]  rcu_core+0x549/0xb30
[  417.129839]  rcu_core_si+0xe/0x20
[  417.130005]  handle_softirqs+0x160/0x570
[  417.130190]  __irq_exit_rcu+0x189/0x1e0
[  417.130369]  irq_exit_rcu+0xe/0x20
[  417.130531]  sysvec_apic_timer_interrupt+0x9f/0xd0
[  417.130768]  asm_sysvec_apic_timer_interrupt+0x1b/0x20

[  417.131082] Last potentially related work creation:
[  417.131305]  kasan_save_stack+0x26/0x60
[  417.131484]  kasan_record_aux_stack+0xae/0xd0
[  417.131695]  __call_rcu_common+0xcd/0x14b0
[  417.131909]  call_rcu+0x31/0x50
[  417.132071]  delayed_put_task_struct+0x128/0x190
[  417.132295]  rcu_do_batch+0x3d3/0xe70
[  417.132478]  rcu_core+0x549/0xb30
[  417.132658]  rcu_core_si+0xe/0x20
[  417.132808]  handle_softirqs+0x160/0x570
[  417.132993]  __irq_exit_rcu+0x189/0x1e0
[  417.133181]  irq_exit_rcu+0xe/0x20
[  417.133353]  sysvec_apic_timer_interrupt+0x9f/0xd0
[  417.133584]  asm_sysvec_apic_timer_interrupt+0x1b/0x20

[  417.133921] Second to last potentially related work creation:
[  417.134183]  kasan_save_stack+0x26/0x60
[  417.134362]  kasan_record_aux_stack+0xae/0xd0
[  417.134566]  __call_rcu_common+0xcd/0x14b0
[  417.134782]  call_rcu+0x31/0x50
[  417.134929]  put_task_struct_rcu_user+0x58/0xb0
[  417.135143]  finish_task_switch.isra.0+0x5d3/0x830
[  417.135366]  __schedule+0xd30/0x5100
[  417.135534]  schedule_idle+0x5a/0x90
[  417.135712]  do_idle+0x25f/0x410
[  417.135871]  cpu_startup_entry+0x53/0x70
[  417.136053]  start_secondary+0x216/0x2c0
[  417.136233]  common_startup_64+0x13e/0x141

[  417.136894] The buggy address belongs to the object at ffff888124870000
                which belongs to the cache task_struct of size 10504
[  417.138122] The buggy address is located 52 bytes inside of
                freed 10504-byte region [ffff888124870000, ffff888124872908)

[  417.139465] The buggy address belongs to the physical page:
[  417.140016] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
pfn:0x124870
[  417.140789] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0
pincount:0
[  417.141519] memcg:ffff88811aa20e01
[  417.141874] anon flags:
0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff)
[  417.142600] page_type: f5(slab)
[  417.142922] raw: 0017ffffc0000040 ffff88810094f040 0000000000000000
dead000000000001
[  417.143554] raw: 0000000000000000 0000000000030003 00000000f5000000
ffff88811aa20e01
[  417.143954] head: 0017ffffc0000040 ffff88810094f040 0000000000000000
dead000000000001
[  417.144329] head: 0000000000000000 0000000000030003 00000000f5000000
ffff88811aa20e01
[  417.144710] head: 0017ffffc0000003 ffffea0004921c01 00000000ffffffff
00000000ffffffff
[  417.145106] head: ffffffffffffffff 0000000000000000 00000000ffffffff
0000000000000008
[  417.145485] page dumped because: kasan: bad access detected

[  417.145859] Memory state around the buggy address:
[  417.146094]  ffff88812486ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
fc
[  417.146439]  ffff88812486ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
fc
[  417.146791] >ffff888124870000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  417.147145]                                      ^
[  417.147387]  ffff888124870080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  417.147751]  ffff888124870100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  417.148123]
==================================================================

First of all, we have warning in get_bvec_at() because
cursor->total_resid contains zero value. And, finally,
we have crash in ceph_msg_data_advance() because
cursor->data is NULL. It means that get_bvec_at()
receives not initialized ceph_msg_data_cursor structure
because data is NULL and total_resid contains zero.

Moreover, we don't have likewise issue for the case of
Ceph msgr1 protocol because ceph_msg_data_cursor_init()
has been called before reading sparse data.

This patch adds calling of ceph_msg_data_cursor_init()
in the beginning of process_v2_sparse_read() with
the goal to guarantee that logic of reading sparse data
works correctly for the case of Ceph msgr2 protocol.

The Linux kernel CVE team has assigned CVE-2025-68297 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.6.119 with commit 5a3f3e39b18705bc578fae58abacc8ef93c15194
	Fixed in 6.12.61 with commit 47144748fbf12068ba4b82512098fe1ac748a2e9
	Fixed in 6.17.11 with commit 7d1b7de853f7d1eefd6d22949bcefc0c25186727
	Fixed in 6.18 with commit 43962db4a6f593903340c85591056a0cef812dfd

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-68297
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/ceph/messenger_v2.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/5a3f3e39b18705bc578fae58abacc8ef93c15194
	https://git.kernel.org/stable/c/47144748fbf12068ba4b82512098fe1ac748a2e9
	https://git.kernel.org/stable/c/7d1b7de853f7d1eefd6d22949bcefc0c25186727
	https://git.kernel.org/stable/c/43962db4a6f593903340c85591056a0cef812dfd

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