CVE-2024-46795— ksmbd: unset the binding mark of a reused connection
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f5a544e3bab78142207e0242d22442db85ba1eff< 9914f1bd61d5e838bb1ab15a71076d37a6db65d1 |
affected |
f5a544e3bab78142207e0242d22442db85ba1eff< 93d54a4b59c4b3d803d20aa645ab5ca71f3b3b02 |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< 41bc256da7e47b679df87c7fc7a5b393052b9cce |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< 4c8496f44f5bb5c06cdef5eb130ab259643392a1 |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< 78c5a6f1f630172b19af4912e755e1da93ef0ab5 |
affected | ||
5.15 |
affected | ||
< 5.15 |
unaffected | ||
5.15.167≤ 5.15.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2024-46795
Vulnerability Information
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Vulnerability Title
ksmbd: unset the binding mark of a reused connection
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: unset the binding mark of a reused connection
Steve French reported null pointer dereference error from sha256 lib.
cifs.ko can send session setup requests on reused connection.
If reused connection is used for binding session, conn->binding can
still remain true and generate_preauth_hash() will not set
sess->Preauth_HashValue and it will be NULL.
It is used as a material to create an encryption key in
ksmbd_gen_smb311_encryptionkey. ->Preauth_HashValue cause null pointer
dereference error from crypto_shash_update().
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 8 PID: 429254 Comm: kworker/8:39
Hardware name: LENOVO 20MAS08500/20MAS08500, BIOS N2CET69W (1.52 )
Workqueue: ksmbd-io handle_ksmbd_work [ksmbd]
RIP: 0010:lib_sha256_base_do_update.isra.0+0x11e/0x1d0 [sha256_ssse3]
<TASK>
? show_regs+0x6d/0x80
? __die+0x24/0x80
? page_fault_oops+0x99/0x1b0
? do_user_addr_fault+0x2ee/0x6b0
? exc_page_fault+0x83/0x1b0
? asm_exc_page_fault+0x27/0x30
? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3]
? lib_sha256_base_do_update.isra.0+0x11e/0x1d0 [sha256_ssse3]
? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3]
? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3]
_sha256_update+0x77/0xa0 [sha256_ssse3]
sha256_avx2_update+0x15/0x30 [sha256_ssse3]
crypto_shash_update+0x1e/0x40
hmac_update+0x12/0x20
crypto_shash_update+0x1e/0x40
generate_key+0x234/0x380 [ksmbd]
generate_smb3encryptionkey+0x40/0x1c0 [ksmbd]
ksmbd_gen_smb311_encryptionkey+0x72/0xa0 [ksmbd]
ntlm_authenticate.isra.0+0x423/0x5d0 [ksmbd]
smb2_sess_setup+0x952/0xaa0 [ksmbd]
__process_request+0xa3/0x1d0 [ksmbd]
__handle_ksmbd_work+0x1c4/0x2f0 [ksmbd]
handle_ksmbd_work+0x2d/0xa0 [ksmbd]
process_one_work+0x16c/0x350
worker_thread+0x306/0x440
? __pfx_worker_thread+0x10/0x10
kthread+0xef/0x120
? __pfx_kthread+0x10/0x10
ret_from_fork+0x44/0x70
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1b/0x30
</TASK>
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-46795
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2024-46795 (5)
Same Patch Batch · Linux · 2024-09-18 · 85 CVEs total
| CVE-2024-46717 | 9.8 CRITICAL | net/mlx5e: SHAMPO, Fix incorrect page release |
| CVE-2024-46736 | 9.8 CRITICAL | smb: client: fix double put of @cfile in smb2_rename_path() |
| CVE-2024-46796 | 9.8 CRITICAL | smb: client: fix double put of @cfile in smb2_set_path_size() |
| CVE-2024-46755 | 8.8 HIGH | wifi: mwifiex: Do not return unused priv in mwifiex_get_priv_by_id() |
| CVE-2024-46750 | 7.8 HIGH | PCI: Add missing bridge lock to pci_bus_lock() |
| CVE-2024-46787 | 7.8 HIGH | userfaultfd: fix checks for huge PMDs |
| CVE-2024-46716 | 7.8 HIGH | dmaengine: altera-msgdma: properly free descriptor in msgdma_free_descriptor |
| CVE-2024-46734 | 7.8 HIGH | btrfs: fix race between direct IO write and fsync when using same fd |
| CVE-2024-46738 | 7.8 HIGH | VMCI: Fix use-after-free when removing resource in vmci_resource_remove() |
| CVE-2024-46740 | 7.8 HIGH | binder: fix UAF caused by offsets overwrite |
| CVE-2024-46781 | 7.8 HIGH | nilfs2: fix missing cleanup on rollforward recovery error |
| CVE-2024-46746 | 7.8 HIGH | HID: amd_sfh: free driver_data after destroying hid device |
| CVE-2024-46780 | 7.8 HIGH | nilfs2: protect references to superblock parameters exposed in sysfs |
| CVE-2024-46741 | 7.8 HIGH | misc: fastrpc: Fix double free of 'buf' in error path |
| CVE-2024-46751 | 7.8 HIGH | btrfs: don't BUG_ON() when 0 reference count at btrfs_lookup_extent_info() |
| CVE-2024-46777 | 7.8 HIGH | udf: Avoid excessive partition lengths |
| CVE-2024-46754 | 7.8 HIGH | bpf: Remove tst_run from lwt_seg6local_prog_ops. |
| CVE-2024-46762 | 7.8 HIGH | xen: privcmd: Fix possible access to a freed kirqfd instance |
| CVE-2024-46765 | 7.8 HIGH | ice: protect XDP configuration with a mutex |
| CVE-2024-46771 | 7.8 HIGH | can: bcm: Remove proc entry when dev is unregistered. |
Showing top 20 of 85 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2024-46795
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