CVE-2026-23204
Detail
Modified After Enrichment This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
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
Metrics
CVSS Version 4.0
CVSS Version 3.x
CVSS Version 2.0
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
NVD assessment
not yet provided.
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Weakness Enumeration
CWE-ID
CWE Name
Source
CWE-125
Out-of-bounds Read
NIST
Change History
9 change records found show changes
CVE Modified by siemens-SADP
7/14/2026 9:18:26 AM
Action
Type
Old Value
New Value
Added
Reference
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Added
Reference
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Added
Affected
[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]}]
CVE Modified by kernel.org
7/04/2026 8:16:54 AM
Action
Type
Old Value
New Value
Added
Reference
https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136
Changed
Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"29681ed51e737be14d18ecd1c304c57002e4b72c","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cfa745830e45ecb75c061aa34330ee0cac941cc7","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"13336a6239b9d7c6e61483017bb8bdfe3ceb10a5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"e41a23e61259f5526af875c3b86b3d42a9bae0e5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"8a672f177ebe19c93d795fbe967846084fbc7943","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cabd1a976375780dabab888784e356f574bbaed8","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","versionType":"semver","status":"unaffected"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.124","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.70","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.10","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"6.19","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
Record truncated, showing 2048 of 2215 characters.
View Entire Change Record [{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"66e4b63d61c15de6ca5332d9ca6db59a404d7136","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"29681ed51e737be14d18ecd1c304c57002e4b72c","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cfa745830e45ecb75c061aa34330ee0cac941cc7","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"13336a6239b9d7c6e61483017bb8bdfe3ceb10a5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"e41a23e61259f5526af875c3b86b3d42a9bae0e5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"8a672f177ebe19c93d795fbe967846084fbc7943","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cabd1a976375780dabab888784e356f574bbaed8","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","versionType":"semver","status":"unaffected"},{"version":"5.10.260","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.124","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.70","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.10","lessThanOr
CVE Modified by CISA-ADP
6/17/2026 6:21:05 AM
Action
Type
Old Value
New Value
Added
SSVC
{"timestamp":"2026-06-16T20:32:50.609345Z","id":"CVE-2026-23204","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}
CVE Modified by kernel.org
6/17/2026 6:21:05 AM
Action
Type
Old Value
New Value
Added
Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"29681ed51e737be14d18ecd1c304c57002e4b72c","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cfa745830e45ecb75c061aa34330ee0cac941cc7","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"13336a6239b9d7c6e61483017bb8bdfe3ceb10a5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"e41a23e61259f5526af875c3b86b3d42a9bae0e5","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"8a672f177ebe19c93d795fbe967846084fbc7943","versionType":"git","status":"affected"},{"version":"fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d","lessThan":"cabd1a976375780dabab888784e356f574bbaed8","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/sched/cls_u32.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","versionType":"semver","status":"unaffected"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.124","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.70","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.10","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"6.19","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
CVE Modified by kernel.org
6/01/2026 1:16:44 PM
Action
Type
Old Value
New Value
Added
Reference
https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c
CVE Modified by kernel.org
4/03/2026 10:16:27 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CVE Modified by kernel.org
3/25/2026 7:16:19 AM
Action
Type
Old Value
New Value
Added
Reference
https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7
Initial Analysis by NIST
3/19/2026 12:34:35 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Added
CWE
CWE-125
Added
CPE Configuration
OR
*cpe:2.3:o:linux:linux_kernel:2.6.35:rc4:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:2.6.35:rc3:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:2.6.35:rc2:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:2.6.35:rc5:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:2.6.35:rc6:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:2.6.35:-:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.70
*cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.10
*cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.35.1 up to (excluding) 6.6.124
Added
Reference Type
kernel.org: https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 Types: Patch
Added
Reference Type
kernel.org: https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943 Types: Patch
Added
Reference Type
kernel.org: https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8 Types: Patch
Added
Reference Type
kernel.org: https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5 Types: Patch
New CVE Received from kernel.org
2/14/2026 12:15:58 PM
Action
Type
Old Value
New Value
Added
Description
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
Added
Reference
https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5
Added
Reference
https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943
Added
Reference
https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8
Added
Reference
https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5
Quick Info
CVE Dictionary Entry: CVE-2026-23204 NVD
Published Date: 02/14/2026 NVD
Last Modified: 07/14/2026
Source: kernel.org
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