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CVE-2026-31533— net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption

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，该漏洞源于在tls_do_encryption的-EBUSY错误路径中存在释放后重用，可能导致双重清理encrypt_pending和scatterlist条目。

CVSS 9.8 · Critical EPSS 0.73% · P53

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux 3ade391adc584f17b5570fd205de3ad029090368< 414fc5e5a5aff776c150f1b86770e0a25a35df3a affected
cd1bbca03f3c1d845ce274c0d0a66de8e5929f72< 02f3ecadb23558bbe068e6504118f1b712d4ece0 affected
13eca403876bbea3716e82cdfe6f1e6febb38754< 0e43e0a3c94044acc74b8e0927c27972eb5a59e8 affected
8590541473188741055d27b955db0777569438e3< aa9facde6c5005205874c37db3fd25799d741baf affected
8590541473188741055d27b955db0777569438e3< 5d70eb25b41e9b010828cd12818b06a0c3b04412 affected
8590541473188741055d27b955db0777569438e3< 2694d408b0e595024e0fc1d64ff9db0358580f74 affected
8590541473188741055d27b955db0777569438e3< a9b8b18364fffce4c451e6f6fd218fa4ab646705 affected
ab6397f072e5097f267abf5cb08a8004e6b17694 affected
… +13 more rows
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I. Basic Information for CVE-2026-31533

Vulnerability Information
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Vulnerability Title
net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption The -EBUSY handling in tls_do_encryption(), introduced by commit 859054147318 ("net: tls: handle backlogging of crypto requests"), has a use-after-free due to double cleanup of encrypt_pending and the scatterlist entry. When crypto_aead_encrypt() returns -EBUSY, the request is enqueued to the cryptd backlog and the async callback tls_encrypt_done() will be invoked upon completion. That callback unconditionally restores the scatterlist entry (sge->offset, sge->length) and decrements ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an error, the synchronous error path in tls_do_encryption() performs the same cleanup again, double-decrementing encrypt_pending and double-restoring the scatterlist. The double-decrement corrupts the encrypt_pending sentinel (initialized to 1), making tls_encrypt_async_wait() permanently skip the wait for pending async callbacks. A subsequent sendmsg can then free the tls_rec via bpf_exec_tx_verdict() while a cryptd callback is still pending, resulting in a use-after-free when the callback fires on the freed record. Fix this by skipping the synchronous cleanup when the -EBUSY async wait returns an error, since the callback has already handled encrypt_pending and sge restoration.
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，该漏洞源于在tls_do_encryption的-EBUSY错误路径中存在释放后重用，可能导致双重清理encrypt_pending和scatterlist条目。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3ade391adc584f17b5570fd205de3ad029090368 ~ 414fc5e5a5aff776c150f1b86770e0a25a35df3a -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-31533

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III. Intelligence Information for CVE-2026-31533

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Same Patch Batch · Linux · 2026-04-23 · 3 CVEs total

CVE-2026-31532 7.8 HIGH can: raw: fix ro->uniq use-after-free in raw_rcv()
CVE-2026-31531 ipv4: nexthop: allocate skb dynamically in rtm_get_nexthop()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31533

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