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CVE-2025-38488— smb: client: fix use-after-free in crypt_message when using async crypto

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crypt_message函数中使用释放后重用。

CVSS 9.8 · Critical EPSS 0.72% · P53

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 8f14a476abba13144df5434871a7225fd29af633< 5d047b12f86cc3b9fde1171c02d9bccf4dba0632 affected
ef51c0d544b1518b35364480317ab6d3468f205d< 6550b2bef095d0dd2d2c8390d2ea4c3837028833 affected
bce966530fd5542bbb422cb45ecb775f7a1a6bc3< 9a1d3e8d40f151c2d5a5f40c410e6e433f62f438 affected
0809fb86ad13b29e1d6d491364fc7ea4fb545995< 15a0a5de49507062bc3be4014a403d8cea5533de affected
b0abcd65ec545701b8793e12bc27dc98042b151a< 2a76bc2b24ed889a689fb1c9015307bf16aafb5b affected
b0abcd65ec545701b8793e12bc27dc98042b151a< 8ac90f6824fc44d2e55a82503ddfc95defb19ae0 affected
b0abcd65ec545701b8793e12bc27dc98042b151a< b220bed63330c0e1733dc06ea8e75d5b9962b6b6 affected
538c26d9bf70c90edc460d18c81008a4e555925a affected
… +14 more rows
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I. Basic Information for CVE-2025-38488

Vulnerability Information
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Vulnerability Title
smb: client: fix use-after-free in crypt_message when using async crypto
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in crypt_message when using async crypto The CVE-2024-50047 fix removed asynchronous crypto handling from crypt_message(), assuming all crypto operations are synchronous. However, when hardware crypto accelerators are used, this can cause use-after-free crashes: crypt_message() // Allocate the creq buffer containing the req creq = smb2_get_aead_req(..., &req); // Async encryption returns -EINPROGRESS immediately rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Free creq while async operation is still in progress kvfree_sensitive(creq, ...); Hardware crypto modules often implement async AEAD operations for performance. When crypto_aead_encrypt/decrypt() returns -EINPROGRESS, the operation completes asynchronously. Without crypto_wait_req(), the function immediately frees the request buffer, leading to crashes when the driver later accesses the freed memory. This results in a use-after-free condition when the hardware crypto driver later accesses the freed request structure, leading to kernel crashes with NULL pointer dereferences. The issue occurs because crypto_alloc_aead() with mask=0 doesn't guarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in the mask, async implementations can be selected. Fix by restoring the async crypto handling: - DECLARE_CRYPTO_WAIT(wait) for completion tracking - aead_request_set_callback() for async completion notification - crypto_wait_req() to wait for operation completion This ensures the request buffer isn't freed until the crypto operation completes, whether synchronous or asynchronous, while preserving the CVE-2024-50047 fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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crypt_message函数中使用释放后重用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8f14a476abba13144df5434871a7225fd29af633 ~ 5d047b12f86cc3b9fde1171c02d9bccf4dba0632 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-38488

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III. Intelligence Information for CVE-2025-38488

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Same Patch Batch · Linux · 2025-07-28 · 29 CVEs total

CVE-2025-38490 9.8 CRITICAL net: libwx: remove duplicate page_pool_put_full_page()
CVE-2025-38471 9.8 CRITICAL tls: always refresh the queue when reading sock
CVE-2025-38472 9.8 CRITICAL netfilter: nf_conntrack: fix crash due to removal of uninitialised entry
CVE-2025-38476 9.8 CRITICAL rpl: Fix use-after-free in rpl_do_srh_inline().
CVE-2025-38495 8.8 HIGH HID: core: ensure the allocated report buffer can contain the reserved report ID
CVE-2025-38491 8.2 HIGH mptcp: make fallback action and fallback decision atomic
CVE-2025-38477 7.8 HIGH net/sched: sch_qfq: Fix race condition on qfq_aggregate
CVE-2025-38485 7.8 HIGH iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush
CVE-2025-38486 7.8 HIGH soundwire: Revert "soundwire: qcom: Add set_channel_map api support"
CVE-2025-38484 7.8 HIGH iio: backend: fix out-of-bound write
CVE-2025-38494 7.8 HIGH HID: core: do not bypass hid_hw_raw_request
CVE-2025-38478 7.8 HIGH comedi: Fix initialization of data for instructions that write to subdevice
CVE-2025-38475 7.8 HIGH smc: Fix various oops due to inet_sock type confusion.
CVE-2025-38470 7.8 HIGH net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime
CVE-2025-38493 tracing/osnoise: Fix crash in timerlat_dump_stack()
CVE-2025-38492 netfs: Fix race between cache write completion and ALL_QUEUED being set
CVE-2025-38483 comedi: das16m1: Fix bit shift out of bounds
CVE-2025-38496 dm-bufio: fix sched in atomic context
CVE-2025-38497 usb: gadget: configfs: Fix OOB read on empty string write
CVE-2025-38489 s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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