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CVE-2026-74610— tls: don't leave a full plaintext sk_msg ring unpushed

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基金会开源的一个操作系统内核。 Linux kernel 6.5版本存在安全漏洞，该漏洞源于net/tls/tls_sw.c中tls_sw_sendmsg_locked()在sk_msg环填满时未设置full_record，且sk_msg_page_add()缺少完整度检查，导致空指针解引用，可能允许无特权用户通过带tls ULP的回环TCP套接字触发拒绝服务。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux fe1e81d4f73b6cbaed4fcc476960d26770642842< aa8b14647721b5a4958712b35cf43e3125d47753 affected
fe1e81d4f73b6cbaed4fcc476960d26770642842< f634289a0b557a197c5f37284b623cefedfe73d5 affected
fe1e81d4f73b6cbaed4fcc476960d26770642842< 3fc5044796dd87b8d68be4207046f5ce2748174c affected
fe1e81d4f73b6cbaed4fcc476960d26770642842< 3c5f8f2aa57c647b83add4896aab64aac5fdedad affected
fe1e81d4f73b6cbaed4fcc476960d26770642842< 7bca91d63341274e857f4aeaad54d229405e93dc affected
6.5 affected
< 6.5 unaffected
6.6.152≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74610

Vulnerability Information
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Vulnerability Title
tls: don't leave a full plaintext sk_msg ring unpushed
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tls: don't leave a full plaintext sk_msg ring unpushed When the copy path in tls_sw_sendmsg_locked() adds the fragment that fills the plaintext sk_msg ring, it does not set full_record, so the record is left full and unpushed. A later splice() then adds to an already full ring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps onto sg.start and the ring appears empty. Fragments added after that overwrite live entries, and sg.size no longer matches what is reachable between sg.start and sg.end, so pushing the record runs the scatterwalk off the end of the scatterlist. An unprivileged user can trigger this on a loopback TCP socket with the "tls" ULP attached: BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0 Call Trace: skcipher_walk_next+0x1d1/0x2c0 gcm_encrypt_aesni_avx+0x1e9/0x220 bpf_exec_tx_verdict+0x3bb/0x860 tls_sw_sendmsg+0xa1a/0xca0 __sys_sendto+0x1da/0x1f0 Set full_record in the copy path when the ring becomes full, and push a record that is already full on entry to the sendmsg 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基金会开源的一个操作系统内核。 Linux kernel 6.5版本存在安全漏洞，该漏洞源于net/tls/tls_sw.c中tls_sw_sendmsg_locked()在sk_msg环填满时未设置full_record，且sk_msg_page_add()缺少完整度检查，导致空指针解引用，可能允许无特权用户通过带tls ULP的回环TCP套接字触发拒绝服务。
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 fe1e81d4f73b6cbaed4fcc476960d26770642842 ~ aa8b14647721b5a4958712b35cf43e3125d47753 -
Linux Linux 6.5 -

II. Public POCs for CVE-2026-74610

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III. Intelligence Information for CVE-2026-74610

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Patches & Fixes for CVE-2026-74610 (5)

Same Patch Batch · Linux · 2026-08-22 · 149 CVEs total

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74610

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