7.8

CVE-2026-46323

net: gro: don't merge zcopy skbs

In the Linux kernel, the following vulnerability has been resolved:

net: gro: don't merge zcopy skbs

skb_gro_receive() can currently copy frags between the source and GRO
skb, without checking the zerocopy status, and in particular the
SKBFL_MANAGED_FRAG_REFS flag.

When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference
on the pages in shinfo->frags. Appending those frags to another skb's
frags without fixing up the page refcount can lead to UAF.

When either the last skb in the GRO chain (the one we would append
frags to) or the source skb is zerocopy, don't merge the skbs.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.0 < 6.1.176
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.142
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.92
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.34
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.11
Linux ≫ Linux Kernel Version7.1 Updaterc1
Linux ≫ Linux Kernel Version7.1 Updaterc2
Linux ≫ Linux Kernel Version7.1 Updaterc3
Linux ≫ Linux Kernel Version7.1 Updaterc4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.14% 0.035
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-123 Write-what-where Condition

Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.

CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06
Patch
https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a
Patch
https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71
Patch
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1
Patch
https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40
Patch
https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d
Patch
https://bugzilla.redhat.com/show_bug.cgi?id=2479832
Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46323.json
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36018
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27731
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27735
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:27708
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-46323
Third Party Advisory