CVE-2026-43407 (GCVE-0-2026-43407)
Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-09 04:10
VLAI?
Title
libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
Summary
In the Linux kernel, the following vulnerability has been resolved:
libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
This patch fixes an out-of-bounds access in ceph_handle_auth_reply()
that can be triggered by a message of type CEPH_MSG_AUTH_REPLY. In
ceph_handle_auth_reply(), the value of the payload_len field of such a
message is stored in a variable of type int. A value greater than
INT_MAX leads to an integer overflow and is interpreted as a negative
value. This leads to decrementing the pointer address by this value and
subsequently accessing it because ceph_decode_need() only checks that
the memory access does not exceed the end address of the allocation.
This patch fixes the issue by changing the data type of payload_len to
u32. Additionally, the data type of result_msg_len is changed to u32,
as it is also a variable holding a non-negative length.
Also, an additional layer of sanity checks is introduced, ensuring that
directly after reading it from the message, payload_len and
result_msg_len are not greater than the overall segment length.
BUG: KASAN: slab-out-of-bounds in ceph_handle_auth_reply+0x642/0x7a0 [libceph]
Read of size 4 at addr ffff88811404df14 by task kworker/20:1/262
CPU: 20 UID: 0 PID: 262 Comm: kworker/20:1 Not tainted 6.19.2 #5 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: ceph-msgr ceph_con_workfn [libceph]
Call Trace:
<TASK>
dump_stack_lvl+0x76/0xa0
print_report+0xd1/0x620
? __pfx__raw_spin_lock_irqsave+0x10/0x10
? kasan_complete_mode_report_info+0x72/0x210
kasan_report+0xe7/0x130
? ceph_handle_auth_reply+0x642/0x7a0 [libceph]
? ceph_handle_auth_reply+0x642/0x7a0 [libceph]
__asan_report_load_n_noabort+0xf/0x20
ceph_handle_auth_reply+0x642/0x7a0 [libceph]
mon_dispatch+0x973/0x23d0 [libceph]
? apparmor_socket_recvmsg+0x6b/0xa0
? __pfx_mon_dispatch+0x10/0x10 [libceph]
? __kasan_check_write+0x14/0x30i
? mutex_unlock+0x7f/0xd0
? __pfx_mutex_unlock+0x10/0x10
? __pfx_do_recvmsg+0x10/0x10 [libceph]
ceph_con_process_message+0x1f1/0x650 [libceph]
process_message+0x1e/0x450 [libceph]
ceph_con_v2_try_read+0x2e48/0x6c80 [libceph]
? __pfx_ceph_con_v2_try_read+0x10/0x10 [libceph]
? save_fpregs_to_fpstate+0xb0/0x230
? raw_spin_rq_unlock+0x17/0xa0
? finish_task_switch.isra.0+0x13b/0x760
? __switch_to+0x385/0xda0
? __kasan_check_write+0x14/0x30
? mutex_lock+0x8d/0xe0
? __pfx_mutex_lock+0x10/0x10
ceph_con_workfn+0x248/0x10c0 [libceph]
process_one_work+0x629/0xf80
? __kasan_check_write+0x14/0x30
worker_thread+0x87f/0x1570
? __pfx__raw_spin_lock_irqsave+0x10/0x10
? __pfx_try_to_wake_up+0x10/0x10
? kasan_print_address_stack_frame+0x1f7/0x280
? __pfx_worker_thread+0x10/0x10
kthread+0x396/0x830
? __pfx__raw_spin_lock_irq+0x10/0x10
? __pfx_kthread+0x10/0x10
? __kasan_check_write+0x14/0x30
? recalc_sigpending+0x180/0x210
? __pfx_kthread+0x10/0x10
ret_from_fork+0x3f7/0x610
? __pfx_ret_from_fork+0x10/0x10
? __switch_to+0x385/0xda0
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
[ idryomov: replace if statements with ceph_decode_need() for
payload_len and result_msg_len ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < ea080b21092590122c3f971cf588932cdbf47847
(git)
Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < edc678e5cd11730a2834b43071d8923f05bc334d (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 6cee34d6669fe176b4259131adb1a145c939b472 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 8bb87547e92dcf0928ed763c60e0ac8d733c3656 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < ed024d2f4c79c0eb2464df0fb640610ac301f9a0 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < f9da5c1bbac5c8e33259fe00ed7347438fffa969 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 9f9e2297f45fc2d2524eb104c289d69ddef95665 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < b282c43ed156ae15ea76748fc15cd5c39dc9ab72 (git) |
|||||||
|
|||||||||
{
"containers": {
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{
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{
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"status": "unaffected",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
{
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},
{
"lessThanOrEqual": "6.18.*",
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"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
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"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()\n\nThis patch fixes an out-of-bounds access in ceph_handle_auth_reply()\nthat can be triggered by a message of type CEPH_MSG_AUTH_REPLY. In\nceph_handle_auth_reply(), the value of the payload_len field of such a\nmessage is stored in a variable of type int. A value greater than\nINT_MAX leads to an integer overflow and is interpreted as a negative\nvalue. This leads to decrementing the pointer address by this value and\nsubsequently accessing it because ceph_decode_need() only checks that\nthe memory access does not exceed the end address of the allocation.\n\nThis patch fixes the issue by changing the data type of payload_len to\nu32. Additionally, the data type of result_msg_len is changed to u32,\nas it is also a variable holding a non-negative length.\n\nAlso, an additional layer of sanity checks is introduced, ensuring that\ndirectly after reading it from the message, payload_len and\nresult_msg_len are not greater than the overall segment length.\n\nBUG: KASAN: slab-out-of-bounds in ceph_handle_auth_reply+0x642/0x7a0 [libceph]\nRead of size 4 at addr ffff88811404df14 by task kworker/20:1/262\n\nCPU: 20 UID: 0 PID: 262 Comm: kworker/20:1 Not tainted 6.19.2 #5 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nWorkqueue: ceph-msgr ceph_con_workfn [libceph]\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x76/0xa0\n print_report+0xd1/0x620\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? kasan_complete_mode_report_info+0x72/0x210\n kasan_report+0xe7/0x130\n ? ceph_handle_auth_reply+0x642/0x7a0 [libceph]\n ? ceph_handle_auth_reply+0x642/0x7a0 [libceph]\n __asan_report_load_n_noabort+0xf/0x20\n ceph_handle_auth_reply+0x642/0x7a0 [libceph]\n mon_dispatch+0x973/0x23d0 [libceph]\n ? apparmor_socket_recvmsg+0x6b/0xa0\n ? __pfx_mon_dispatch+0x10/0x10 [libceph]\n ? __kasan_check_write+0x14/0x30i\n ? mutex_unlock+0x7f/0xd0\n ? __pfx_mutex_unlock+0x10/0x10\n ? __pfx_do_recvmsg+0x10/0x10 [libceph]\n ceph_con_process_message+0x1f1/0x650 [libceph]\n process_message+0x1e/0x450 [libceph]\n ceph_con_v2_try_read+0x2e48/0x6c80 [libceph]\n ? __pfx_ceph_con_v2_try_read+0x10/0x10 [libceph]\n ? save_fpregs_to_fpstate+0xb0/0x230\n ? raw_spin_rq_unlock+0x17/0xa0\n ? finish_task_switch.isra.0+0x13b/0x760\n ? __switch_to+0x385/0xda0\n ? __kasan_check_write+0x14/0x30\n ? mutex_lock+0x8d/0xe0\n ? __pfx_mutex_lock+0x10/0x10\n ceph_con_workfn+0x248/0x10c0 [libceph]\n process_one_work+0x629/0xf80\n ? __kasan_check_write+0x14/0x30\n worker_thread+0x87f/0x1570\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n ? __pfx_try_to_wake_up+0x10/0x10\n ? kasan_print_address_stack_frame+0x1f7/0x280\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x396/0x830\n ? __pfx__raw_spin_lock_irq+0x10/0x10\n ? __pfx_kthread+0x10/0x10\n ? __kasan_check_write+0x14/0x30\n ? recalc_sigpending+0x180/0x210\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x3f7/0x610\n ? __pfx_ret_from_fork+0x10/0x10\n ? __switch_to+0x385/0xda0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\n[ idryomov: replace if statements with ceph_decode_need() for\n payload_len and result_msg_len ]"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-09T04:10:54.228Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ea080b21092590122c3f971cf588932cdbf47847"
},
{
"url": "https://git.kernel.org/stable/c/edc678e5cd11730a2834b43071d8923f05bc334d"
},
{
"url": "https://git.kernel.org/stable/c/6cee34d6669fe176b4259131adb1a145c939b472"
},
{
"url": "https://git.kernel.org/stable/c/8bb87547e92dcf0928ed763c60e0ac8d733c3656"
},
{
"url": "https://git.kernel.org/stable/c/ed024d2f4c79c0eb2464df0fb640610ac301f9a0"
},
{
"url": "https://git.kernel.org/stable/c/f9da5c1bbac5c8e33259fe00ed7347438fffa969"
},
{
"url": "https://git.kernel.org/stable/c/9f9e2297f45fc2d2524eb104c289d69ddef95665"
},
{
"url": "https://git.kernel.org/stable/c/b282c43ed156ae15ea76748fc15cd5c39dc9ab72"
}
],
"title": "libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-43407",
"datePublished": "2026-05-08T14:21:46.927Z",
"dateReserved": "2026-05-01T14:12:56.008Z",
"dateUpdated": "2026-05-09T04:10:54.228Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-43407",
"date": "2026-05-10",
"epss": "0.00024",
"percentile": "0.0704"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43407\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T15:16:52.250\",\"lastModified\":\"2026-05-08T15:16:52.250\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()\\n\\nThis patch fixes an out-of-bounds access in ceph_handle_auth_reply()\\nthat can be triggered by a message of type CEPH_MSG_AUTH_REPLY. In\\nceph_handle_auth_reply(), the value of the payload_len field of such a\\nmessage is stored in a variable of type int. A value greater than\\nINT_MAX leads to an integer overflow and is interpreted as a negative\\nvalue. This leads to decrementing the pointer address by this value and\\nsubsequently accessing it because ceph_decode_need() only checks that\\nthe memory access does not exceed the end address of the allocation.\\n\\nThis patch fixes the issue by changing the data type of payload_len to\\nu32. Additionally, the data type of result_msg_len is changed to u32,\\nas it is also a variable holding a non-negative length.\\n\\nAlso, an additional layer of sanity checks is introduced, ensuring that\\ndirectly after reading it from the message, payload_len and\\nresult_msg_len are not greater than the overall segment length.\\n\\nBUG: KASAN: slab-out-of-bounds in ceph_handle_auth_reply+0x642/0x7a0 [libceph]\\nRead of size 4 at addr ffff88811404df14 by task kworker/20:1/262\\n\\nCPU: 20 UID: 0 PID: 262 Comm: kworker/20:1 Not tainted 6.19.2 #5 PREEMPT(voluntary)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nWorkqueue: ceph-msgr ceph_con_workfn [libceph]\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x76/0xa0\\n print_report+0xd1/0x620\\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n ? kasan_complete_mode_report_info+0x72/0x210\\n kasan_report+0xe7/0x130\\n ? ceph_handle_auth_reply+0x642/0x7a0 [libceph]\\n ? ceph_handle_auth_reply+0x642/0x7a0 [libceph]\\n __asan_report_load_n_noabort+0xf/0x20\\n ceph_handle_auth_reply+0x642/0x7a0 [libceph]\\n mon_dispatch+0x973/0x23d0 [libceph]\\n ? apparmor_socket_recvmsg+0x6b/0xa0\\n ? __pfx_mon_dispatch+0x10/0x10 [libceph]\\n ? __kasan_check_write+0x14/0x30i\\n ? mutex_unlock+0x7f/0xd0\\n ? __pfx_mutex_unlock+0x10/0x10\\n ? __pfx_do_recvmsg+0x10/0x10 [libceph]\\n ceph_con_process_message+0x1f1/0x650 [libceph]\\n process_message+0x1e/0x450 [libceph]\\n ceph_con_v2_try_read+0x2e48/0x6c80 [libceph]\\n ? __pfx_ceph_con_v2_try_read+0x10/0x10 [libceph]\\n ? save_fpregs_to_fpstate+0xb0/0x230\\n ? raw_spin_rq_unlock+0x17/0xa0\\n ? finish_task_switch.isra.0+0x13b/0x760\\n ? __switch_to+0x385/0xda0\\n ? __kasan_check_write+0x14/0x30\\n ? mutex_lock+0x8d/0xe0\\n ? __pfx_mutex_lock+0x10/0x10\\n ceph_con_workfn+0x248/0x10c0 [libceph]\\n process_one_work+0x629/0xf80\\n ? __kasan_check_write+0x14/0x30\\n worker_thread+0x87f/0x1570\\n ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n ? __pfx_try_to_wake_up+0x10/0x10\\n ? kasan_print_address_stack_frame+0x1f7/0x280\\n ? __pfx_worker_thread+0x10/0x10\\n kthread+0x396/0x830\\n ? __pfx__raw_spin_lock_irq+0x10/0x10\\n ? __pfx_kthread+0x10/0x10\\n ? __kasan_check_write+0x14/0x30\\n ? recalc_sigpending+0x180/0x210\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x3f7/0x610\\n ? __pfx_ret_from_fork+0x10/0x10\\n ? __switch_to+0x385/0xda0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n \u003c/TASK\u003e\\n\\n[ idryomov: replace if statements with ceph_decode_need() for\\n payload_len and result_msg_len ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6cee34d6669fe176b4259131adb1a145c939b472\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bb87547e92dcf0928ed763c60e0ac8d733c3656\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f9e2297f45fc2d2524eb104c289d69ddef95665\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b282c43ed156ae15ea76748fc15cd5c39dc9ab72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea080b21092590122c3f971cf588932cdbf47847\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed024d2f4c79c0eb2464df0fb640610ac301f9a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/edc678e5cd11730a2834b43071d8923f05bc334d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9da5c1bbac5c8e33259fe00ed7347438fffa969\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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