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CVE-2026-46300— net: skbuff: preserve shared-frag marker during coalescing

Quick assessment

Affected
Linux Linux
Exploitation
High exploitation probability; assess promptly
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skb_try_coalesce在合并期间未传播SKBFL_SHARED_FRAG标记，可能导致ESP解密时绕过共享分片检查，在页面缓存备份分片上就地解密。

CVSS 7.8 · High EPSS 9.48% · P95

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9< 3599e6b3cc1ada96883d496a50a210d3afbb6987 affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 78bf6b6bb19541d19fbda6242e7cfe2c682763c0 affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 3bd9e113d50034db99d7ef69fd8e5242d15e414a affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< 3884358a9286b17f389a72b1426fc4547c23c111 affected
cef401de7be8c4e155c6746bfccf721a4fa5fab9< f84eca5817390257cef78013d0112481c503b4a3 affected
… +10 more rows
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I. Basic Information for CVE-2026-46300

Vulnerability Information
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Vulnerability Title
net: skbuff: preserve shared-frag marker during coalescing
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
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skb_try_coalesce在合并期间未传播SKBFL_SHARED_FRAG标记，可能导致ESP解密时绕过共享分片检查，在页面缓存备份分片上就地解密。
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 cef401de7be8c4e155c6746bfccf721a4fa5fab9 ~ 3599e6b3cc1ada96883d496a50a210d3afbb6987 -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-46300

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III. Intelligence Information for CVE-2026-46300

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Patches & Fixes for CVE-2026-46300 (14)

Other References for CVE-2026-46300 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46300

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