RHSA-2025:13805
Vulnerability from csaf_redhat - Published: 2025-08-13 15:29 - Updated: 2026-11-05 10:22Summary
Red Hat Security Advisory: kernel security update
Severity
Moderate
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: ext4: fix off-by-one error in do_split (CVE-2025-23150)
* kernel: ext4: avoid resizing to a partial cluster size (CVE-2022-50020)
* kernel: net: ch9200: fix uninitialised access during mii_nway_restart (CVE-2025-38086)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid resizing to a partial cluster size This patch avoids an attempt to resize the filesystem to an unaligned cluster boundary. An online resize to a size that is not integral to cluster size results in the last iteration attempting to grow the fs by a negative amount, which trips a BUG_ON and leaves the fs with a corrupted in-memory superblock.
7.0 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.168.1.el8_4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.168.1.el8_4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-extra-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-common-x86_64-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-devel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-doc-0:4.18.0-305.168.1.el8_4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-extra-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-libs-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.168.1.el8_4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-abi-stablelists-0:4.18.0-305.168.1.el8_4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-core-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-devel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-modules-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-modules-extra-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-common-x86_64-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-devel-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-doc-0:4.18.0-305.168.1.el8_4.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-extra-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-libs-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
In the Linux kernel, the following vulnerability has been resolved: ext4: fix off-by-one error in do_split Syzkaller detected a use-after-free issue in ext4_insert_dentry that was caused by out-of-bounds access due to incorrect splitting in do_split. BUG: KASAN: use-after-free in ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109 Write of size 251 at addr ffff888074572f14 by task syz-executor335/5847 CPU: 0 UID: 0 PID: 5847 Comm: syz-executor335 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109 add_dirent_to_buf+0x3d9/0x750 fs/ext4/namei.c:2154 make_indexed_dir+0xf98/0x1600 fs/ext4/namei.c:2351 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2455 ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2796 ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3431 vfs_symlink+0x137/0x2e0 fs/namei.c:4615 do_symlinkat+0x222/0x3a0 fs/namei.c:4641 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> The following loop is located right above 'if' statement. for (i = count-1; i >= 0; i--) { /* is more than half of this entry in 2nd half of the block? */ if (size + map[i].size/2 > blocksize/2) break; size += map[i].size; move++; } 'i' in this case could go down to -1, in which case sum of active entries wouldn't exceed half the block size, but previous behaviour would also do split in half if sum would exceed at the very last block, which in case of having too many long name files in a single block could lead to out-of-bounds access and following use-after-free. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
7.1 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2022-50020
Threats
Impact
Moderate
In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read(): if (err == size) { memcpy(data, buf, size); } If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read(): return (buff[0] | buff[1] << 8); The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff". To fix this we should check the return value of control_read() and return early on error.
7.0 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2022-50020
Threats
Impact
Moderate
References
21 references
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"cve": "CVE-2022-50020",
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"name": "Improper Validation of Specified Quantity in Input"
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"discovery_date": "2025-06-18T00:00:00+00:00",
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"text": "2373630"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid resizing to a partial cluster size\n\nThis patch avoids an attempt to resize the filesystem to an\nunaligned cluster boundary. An online resize to a size that is not\nintegral to cluster size results in the last iteration attempting to\ngrow the fs by a negative amount, which trips a BUG_ON and leaves the fs\nwith a corrupted in-memory superblock.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ext4: avoid resizing to a partial cluster size",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat has classified this vulnerability as having Moderate severity because triggering an online filesystem resize requires privileged access, limiting exposure to authorized administrative users. In typical Red Hat Enterprise Linux environments, ext4 filesystems do not enable the non-default cluster allocation feature, preventing unaligned resizing conditions under standard configurations. Even if an unaligned resize is executed on affected storage, the failure manifests as a kernel crash and denial of service rather than privilege escalation or remote compromise.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-50020"
},
{
"category": "external",
"summary": "RHBZ#2373630",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373630"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-50020",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-50020"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-50020",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50020"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025061835-CVE-2022-50020-6f27@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025061835-CVE-2022-50020-6f27@gregkh/T"
}
],
"release_date": "2025-06-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-08-13T15:29:16+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"baseScore": 7.0,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: ext4: avoid resizing to a partial cluster size"
},
{
"cve": "CVE-2025-23150",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-05-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2363268"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix off-by-one error in do_split\n\nSyzkaller detected a use-after-free issue in ext4_insert_dentry that was\ncaused by out-of-bounds access due to incorrect splitting in do_split.\n\nBUG: KASAN: use-after-free in ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109\nWrite of size 251 at addr ffff888074572f14 by task syz-executor335/5847\n\nCPU: 0 UID: 0 PID: 5847 Comm: syz-executor335 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n kasan_check_range+0x282/0x290 mm/kasan/generic.c:189\n __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106\n ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109\n add_dirent_to_buf+0x3d9/0x750 fs/ext4/namei.c:2154\n make_indexed_dir+0xf98/0x1600 fs/ext4/namei.c:2351\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2455\n ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2796\n ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3431\n vfs_symlink+0x137/0x2e0 fs/namei.c:4615\n do_symlinkat+0x222/0x3a0 fs/namei.c:4641\n __do_sys_symlink fs/namei.c:4662 [inline]\n __se_sys_symlink fs/namei.c:4660 [inline]\n __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThe following loop is located right above \u0027if\u0027 statement.\n\nfor (i = count-1; i \u003e= 0; i--) {\n\t/* is more than half of this entry in 2nd half of the block? */\n\tif (size + map[i].size/2 \u003e blocksize/2)\n\t\tbreak;\n\tsize += map[i].size;\n\tmove++;\n}\n\n\u0027i\u0027 in this case could go down to -1, in which case sum of active entries\nwouldn\u0027t exceed half the block size, but previous behaviour would also do\nsplit in half if sum would exceed at the very last block, which in case of\nhaving too many long name files in a single block could lead to\nout-of-bounds access and following use-after-free.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ext4: fix off-by-one error in do_split",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate severity for Red Hat Enterprise Linux because exploitation is restricted to local authenticated users with write permissions on an ext4 filesystem. Red Hat Enterprise Linux uses XFS as the default filesystem, which limits typical exposure unless ext4 partitions are explicitly configured and mounted. A local user with access to write to an ext4 directory could create specific directory entry structures that trigger memory corruption, potentially leading to a system crash or unauthorized disclosure of kernel memory.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-23150"
},
{
"category": "external",
"summary": "RHBZ#2363268",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363268"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-23150",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-23150"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-23150",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23150"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025050127-CVE-2025-23150-15b8@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025050127-CVE-2025-23150-15b8@gregkh/T"
}
],
"release_date": "2025-05-01T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-08-13T15:29:16+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"attackVector": "LOCAL",
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"baseScore": 7.1,
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: ext4: fix off-by-one error in do_split"
},
{
"cve": "CVE-2025-38086",
"cwe": {
"id": "CWE-908",
"name": "Use of Uninitialized Resource"
},
"discovery_date": "2025-06-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2375305"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ch9200: fix uninitialised access during mii_nway_restart\n\nIn mii_nway_restart() the code attempts to call\nmii-\u003emdio_read which is ch9200_mdio_read(). ch9200_mdio_read()\nutilises a local buffer called \"buff\", which is initialised\nwith control_read(). However \"buff\" is conditionally\ninitialised inside control_read():\n\n if (err == size) {\n memcpy(data, buf, size);\n }\n\nIf the condition of \"err == size\" is not met, then\n\"buff\" remains uninitialised. Once this happens the\nuninitialised \"buff\" is accessed and returned during\nch9200_mdio_read():\n\n return (buff[0] | buff[1] \u003c\u003c 8);\n\nThe problem stems from the fact that ch9200_mdio_read()\nignores the return value of control_read(), leading to\nuinit-access of \"buff\".\n\nTo fix this we should check the return value of\ncontrol_read() and return early on error.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: ch9200: fix uninitialised access during mii_nway_restart",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate impact for Red Hat Enterprise Linux because exploitation requires local access or the ability to attach a physical or emulated USB Ethernet adapter to the host system. In typical enterprise server deployments, specialized USB network devices are uncommon, substantially limiting the attack surface. If an attacker attaches a malicious device or triggers an autonegotiation failure on an affected interface, the flaw could result in reading uninitialized kernel memory or unpredictable driver behavior, but does not grant direct remote code execution.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38086"
},
{
"category": "external",
"summary": "RHBZ#2375305",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2375305"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38086",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38086"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38086",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38086"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025062801-CVE-2025-38086-783b@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025062801-CVE-2025-38086-783b@gregkh/T"
}
],
"release_date": "2025-06-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-08-13T15:29:16+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2025:13805"
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-0:4.18.0-305.168.1.el8_4.x86_64",
"BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-tools-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64",
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"BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-0:4.18.0-305.168.1.el8_4.x86_64",
"BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.168.1.el8_4.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: net: ch9200: fix uninitialised access during mii_nway_restart"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.