7.1

CVE-2026-23204

net/sched: cls_u32: use skb_header_pointer_careful()

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

net/sched: cls_u32: use skb_header_pointer_careful()

skb_header_pointer() does not fully validate negative @offset values.

Use skb_header_pointer_careful() instead.

GangMin Kim provided a report and a repro fooling u32_classify():

BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0
net/sched/cls_u32.c:221
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.35.1 < 6.6.124
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.70
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.10
Linux ≫ Linux Kernel Version2.6.35 Update-
Linux ≫ Linux Kernel Version2.6.35 Updaterc2
Linux ≫ Linux Kernel Version2.6.35 Updaterc3
Linux ≫ Linux Kernel Version2.6.35 Updaterc4
Linux ≫ Linux Kernel Version2.6.35 Updaterc5
Linux ≫ Linux Kernel Version2.6.35 Updaterc6
Linux ≫ Linux Kernel Version6.19 Updaterc1
Linux ≫ Linux Kernel Version6.19 Updaterc2
Linux ≫ Linux Kernel Version6.19 Updaterc3
Linux ≫ Linux Kernel Version6.19 Updaterc4
Linux ≫ Linux Kernel Version6.19 Updaterc5
Linux ≫ Linux Kernel Version6.19 Updaterc6
Linux ≫ Linux Kernel Version6.19 Updaterc7
Linux ≫ Linux Kernel Version6.19 Updaterc8
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.019
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5
Patch
https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5
Patch
https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943
Patch
https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8
Patch
https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7
https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c
https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136