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CVE-2026-74693— net: prestera: validate firmware header length

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 5.10版本存在安全漏洞，该漏洞源于prestera_fw_hdr_parse()函数在读取固件头前未验证固件映像是否包含该头部，可能导致越界读取。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 38a3afbf9fd8a2e8c47fa3ca47b425a8a9623240 affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 0fbcceb9d19f2d1dcdf099aee590f2517cb718bb affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< e0f382e8084117f0b11ffb070fe1079e38c0d7f9 affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 6fad06bb793d7089ae05b9fcf46e11be2dfe4850 affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 470ac9cce7308e60cf2dceb448749cdd006e73de affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 363e048a9d0a6c245cbc348c8a220170afed046a affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 7fa8a12296d8d5aa4b1c3904f0b354d81124cf29 affected
4c2703dfd7fabb0824b3bc345f9fa47e33248c14< 8ae344eb540af3f457179b52bc6061416752485c affected
… +10 more rows
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I. Basic Information for CVE-2026-74693

Vulnerability Information
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Vulnerability Title
net: prestera: validate firmware header length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: prestera: validate firmware header length prestera_fw_hdr_parse() reads the firmware header before checking that the firmware image contains that header. Reject images shorter than struct prestera_fw_header before decoding the magic and version fields.
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基金会开源的一个操作系统内核。 Linux kernel 5.10版本存在安全漏洞，该漏洞源于prestera_fw_hdr_parse()函数在读取固件头前未验证固件映像是否包含该头部，可能导致越界读取。
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 4c2703dfd7fabb0824b3bc345f9fa47e33248c14 ~ 38a3afbf9fd8a2e8c47fa3ca47b425a8a9623240 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-74693

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III. Intelligence Information for CVE-2026-74693

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Patches & Fixes for CVE-2026-74693 (7)

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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74662 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-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
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-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
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-2026-74693

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