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CVE-2025-39931— crypto: af_alg - Set merge to zero early in af_alg_sendmsg

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，该漏洞源于未正确设置ctx->merge值，可能导致崩溃。

CVSS 7.8 · High EPSS 0.17% · P5

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< db2b42425dfbde4983b0c20fb7cfa05f70e6a745 affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 6241b9e2809b12da9130894cf5beddf088dc1b8a affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 2374c11189ef704a3e4863646369f1b8e6a27d71 affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 24c1106504c625fabd3b7229611af617b4c27ac7 affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 045ee26aa3920a47ec46d7fcb302420bf01fd753 affected
8ff590903d5fc7f5a0a988c38267a3d08e6393a2< 9574b2330dbd2b5459b74d3b5e9619d39299fc6f affected
2.6.38 affected
… +8 more rows
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I. Basic Information for CVE-2025-39931

Vulnerability Information
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Vulnerability Title
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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，该漏洞源于未正确设置ctx->merge值，可能导致崩溃。
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 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 ~ 28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2025-39931

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III. Intelligence Information for CVE-2025-39931

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Patches & Fixes for CVE-2025-39931 (7)

Same Patch Batch · Linux · 2025-10-04 · 144 CVEs total

CVE-2025-39948 9.8 CRITICAL ice: fix Rx page leak on multi-buffer frames
CVE-2025-39932 9.8 CRITICAL smb: client: let smbd_destroy() call disable_work_sync(&info->post_send_credits_work)
CVE-2025-39946 9.8 CRITICAL tls: make sure to abort the stream if headers are bogus
CVE-2025-39933 9.4 CRITICAL smb: client: let recv_done verify data_offset, data_length and remaining_data_length
CVE-2025-39943 9.4 CRITICAL ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer
CVE-2023-53600 9.1 CRITICAL tunnels: fix kasan splat when generating ipv4 pmtu error
CVE-2023-53589 8.8 HIGH wifi: iwlwifi: mvm: don't trust firmware n_channels
CVE-2023-53586 8.8 HIGH scsi: target: Fix multiple LUN_RESET handling
CVE-2025-39952 8.8 HIGH wifi: wilc1000: avoid buffer overflow in WID string configuration
CVE-2023-53615 8.8 HIGH scsi: qla2xxx: Fix deletion race condition
CVE-2022-50493 8.8 HIGH scsi: qla2xxx: Fix crash when I/O abort times out
CVE-2023-53598 8.4 HIGH bus: mhi: host: Range check CHDBOFF and ERDBOFF
CVE-2023-53560 7.8 HIGH tracing/histograms: Add histograms to hist_vars if they have referenced variables
CVE-2023-53536 7.8 HIGH blk-crypto: make blk_crypto_evict_key() more robust
CVE-2023-53559 7.8 HIGH ip_vti: fix potential slab-use-after-free in decode_session6
CVE-2023-53557 7.8 HIGH fprobe: Release rethook after the ftrace_ops is unregistered
CVE-2023-53556 7.8 HIGH iavf: Fix use-after-free in free_netdev
CVE-2023-53539 7.8 HIGH RDMA/rxe: Fix incomplete state save in rxe_requester
CVE-2023-53608 7.8 HIGH nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()
CVE-2023-53537 7.8 HIGH f2fs: fix to avoid use-after-free for cached IPU bio

Showing top 20 of 144 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39931

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