5.5 CVE-2025-21953
In the Linux kernel, the following vulnerability has been resolved:
net: mana: cleanup mana struct after debugfs_remove()
When on a MANA VM hibernation is triggered, as part of hibernate_snapshot(),
mana_gd_suspend() and mana_gd_resume() are called. If during this
mana_gd_resume(), a failure occurs with HWC creation, mana_port_debugfs
pointer does not get reinitialized and ends up pointing to older,
cleaned-up dentry.
Further in the hibernation path, as part of power_down(), mana_gd_shutdown()
is triggered. This call, unaware of the failures in resume, tries to cleanup
the already cleaned up mana_port_debugfs value and hits the following bug:
[ 191.359296] mana 7870:00:00.0: Shutdown was called
[ 191.359918] BUG: kernel NULL pointer dereference, address: 0000000000000098
[ 191.360584] #PF: supervisor write access in kernel mode
[ 191.361125] #PF: error_code(0x0002) - not-present page
[ 191.361727] PGD 1080ea067 P4D 0
[ 191.362172] Oops: Oops: 0002 [#1] SMP NOPTI
[ 191.362606] CPU: 11 UID: 0 PID: 1674 Comm: bash Not tainted 6.14.0-rc5+ #2
[ 191.363292] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/21/2024
[ 191.364124] RIP: 0010:down_write+0x19/0x50
[ 191.364537] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 de cd ff ff 31 c0 ba 01 00 00 00 <f0> 48 0f b1 13 75 16 65 48 8b 05 88 24 4c 6a 48 89 43 08 48 8b 5d
[ 191.365867] RSP: 0000:ff45fbe0c1c037b8 EFLAGS: 00010246
[ 191.366350] RAX: 0000000000000000 RBX: 0000000000000098 RCX: ffffff8100000000
[ 191.366951] RDX: 0000000000000001 RSI: 0000000000000064 RDI: 0000000000000098
[ 191.367600] RBP: ff45fbe0c1c037c0 R08: 0000000000000000 R09: 0000000000000001
[ 191.368225] R10: ff45fbe0d2b01000 R11: 0000000000000008 R12: 0000000000000000
[ 191.368874] R13: 000000000000000b R14: ff43dc27509d67c0 R15: 0000000000000020
[ 191.369549] FS: 00007dbc5001e740(0000) GS:ff43dc663f380000(0000) knlGS:0000000000000000
[ 191.370213] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 191.370830] CR2: 0000000000000098 CR3: 0000000168e8e002 CR4: 0000000000b73ef0
[ 191.371557] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 191.372192] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ 191.372906] Call Trace:
[ 191.373262] <TASK>
[ 191.373621] ? show_regs+0x64/0x70
[ 191.374040] ? __die+0x24/0x70
[ 191.374468] ? page_fault_oops+0x290/0x5b0
[ 191.374875] ? do_user_addr_fault+0x448/0x800
[ 191.375357] ? exc_page_fault+0x7a/0x160
[ 191.375971] ? asm_exc_page_fault+0x27/0x30
[ 191.376416] ? down_write+0x19/0x50
[ 191.376832] ? down_write+0x12/0x50
[ 191.377232] simple_recursive_removal+0x4a/0x2a0
[ 191.377679] ? __pfx_remove_one+0x10/0x10
[ 191.378088] debugfs_remove+0x44/0x70
[ 191.378530] mana_detach+0x17c/0x4f0
[ 191.378950] ? __flush_work+0x1e2/0x3b0
[ 191.379362] ? __cond_resched+0x1a/0x50
[ 191.379787] mana_remove+0xf2/0x1a0
[ 191.380193] mana_gd_shutdown+0x3b/0x70
[ 191.380642] pci_device_shutdown+0x3a/0x80
[ 191.381063] device_shutdown+0x13e/0x230
[ 191.381480] kernel_power_off+0x35/0x80
[ 191.381890] hibernate+0x3c6/0x470
[ 191.382312] state_store+0xcb/0xd0
[ 191.382734] kobj_attr_store+0x12/0x30
[ 191.383211] sysfs_kf_write+0x3e/0x50
[ 191.383640] kernfs_fop_write_iter+0x140/0x1d0
[ 191.384106] vfs_write+0x271/0x440
[ 191.384521] ksys_write+0x72/0xf0
[ 191.384924] __x64_sys_write+0x19/0x20
[ 191.385313] x64_sys_call+0x2b0/0x20b0
[ 191.385736] do_syscall_64+0x79/0x150
[ 191.386146] ? __mod_memcg_lruvec_state+0xe7/0x240
[ 191.386676] ? __lruvec_stat_mod_folio+0x79/0xb0
[ 191.387124] ? __pfx_lru_add+0x10/0x10
[ 191.387515] ? queued_spin_unlock+0x9/0x10
[ 191.387937] ? do_anonymous_page+0x33c/0xa00
[ 191.388374] ? __handle_mm_fault+0xcf3/0x1210
[ 191.388805] ? __count_memcg_events+0xbe/0x180
[ 191.389235] ? handle_mm_fault+0xae/0x300
[ 19
---truncated---
https://nvd.nist.gov/vuln/detail/CVE-2025-21953
Categories
CWE-476 : NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL. NULL pointer dereferences are frequently resultant from rarely encountered error conditions and race conditions, since these are most likely to escape detection during the testing phases. Common abbreviation for Null Pointer Dereference Common abbreviation for Null Pointer Dereference Common abbreviation for Null Pointer Exception used for access of nil in Go programs This weakness can be detected using dynamic tools and techniques that interact with the software using large test suites with many diverse inputs, such as fuzz testing (fuzzing), robustness testing, and fault injection. The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. Identify error conditions that are not likely to occur during normal usage and trigger them. For example, run the program under low memory conditions, run with insufficient privileges or permissions, interrupt a transaction before it is completed, or disable connectivity to basic network services such as DNS. Monitor the software for any unexpected behavior. If you trigger an unhandled exception or similar error that was discovered and handled by the application's environment, it may still indicate unexpected conditions that were not handled by the application itself. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished. Select a programming language that is not susceptible to these issues. Check the results of all functions that return a value and verify that the value is non-null before acting upon it. Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values. Explicitly initialize all variables and other data stores, either during declaration or just before the first usage. race condition causes a table to be corrupted if a timer activates while it is being modified, leading to resultant NULL dereference; also involves locking. large number of packets leads to NULL dereference packet with invalid error status value triggers NULL dereference Chain: race condition for an argument value, possibly resulting in NULL dereference ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. Chain: Use of an unimplemented network socket operation pointing to an uninitialized handler function (CWE-456) causes a crash because of a null pointer dereference (CWE-476). Chain: race condition (CWE-362) might allow resource to be released before operating on it, leading to NULL dereference (CWE-476) Chain: some unprivileged ioctls do not verify that a structure has been initialized before invocation, leading to NULL dereference Chain: IP and UDP layers each track the same value with different mechanisms that can get out of sync, possibly resulting in a NULL dereference Chain: uninitialized function pointers can be dereferenced allowing code execution Chain: improper initialization of memory can lead to NULL dereference Chain: game server can access player data structures before initialization has happened leading to NULL dereference Chain: The return value of a function returning a pointer is not checked for success (CWE-252) resulting in the later use of an uninitialized variable (CWE-456) and a null pointer dereference (CWE-476) Chain: a message having an unknown message type may cause a reference to uninitialized memory resulting in a null pointer dereference (CWE-476) or dangling pointer (CWE-825), possibly crashing the system or causing heap corruption. Chain: unchecked return value can lead to NULL dereference SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference. Chat client allows remote attackers to cause a denial of service (crash) via a passive DCC request with an invalid ID number, which causes a null dereference. Server allows remote attackers to cause a denial of service (crash) via malformed requests that trigger a null dereference. OS allows remote attackers to cause a denial of service (crash from null dereference) or execute arbitrary code via a crafted request during authentication protocol selection. Game allows remote attackers to cause a denial of service (server crash) via a missing argument, which triggers a null pointer dereference. Network monitor allows remote attackers to cause a denial of service (crash) or execute arbitrary code via malformed packets that cause a NULL pointer dereference. Chain: System call returns wrong value (CWE-393), leading to a resultant NULL dereference (CWE-476).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
CPE
| cpe |
start |
end |
| Configuration 1 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.13 |
< 6.13.8 |
| cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* |
|
|
| cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* |
|
|
| cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* |
|
|
| cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* |
|
|
| cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* |
|
|
| cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* |
|
|
REMEDIATION
Patch
EXPLOITS
Exploit-db.com
| id |
description |
date |
|
| No known exploits |
POC Github
Other Nist (github, ...)
CAPEC
Common Attack Pattern Enumerations and Classifications
| id |
description |
severity |
| No entry |
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