GHSA-2439-4XRR-7J2R
Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-11 21:31In the Linux kernel, the following vulnerability has been resolved:
APEI/GHES: ARM processor Error: don't go past allocated memory
If the BIOS generates a very small ARM Processor Error, or an incomplete one, the current logic will fail to deferrence
err->section_length
and ctx_info->size
Add checks to avoid that. With such changes, such GHESv2 records won't cause OOPSes like this:
[ 1.492129] Internal error: Oops: 0000000096000005 [#1] SMP [ 1.495449] Modules linked in: [ 1.495820] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.18.0-rc1-00017-gabadcc3553dd-dirty #18 PREEMPT [ 1.496125] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022 [ 1.496433] Workqueue: kacpi_notify acpi_os_execute_deferred [ 1.496967] pstate: 814000c5 (Nzcv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 1.497199] pc : log_arm_hw_error+0x5c/0x200 [ 1.497380] lr : ghes_handle_arm_hw_error+0x94/0x220
0xffff8000811c5324 is in log_arm_hw_error (../drivers/ras/ras.c:75). 70 err_info = (struct cper_arm_err_info )(err + 1); 71 ctx_info = (struct cper_arm_ctx_info )(err_info + err->err_info_num); 72 ctx_err = (u8 )ctx_info; 73 74 for (n = 0; n < err->context_info_num; n++) { 75 sz = sizeof(struct cper_arm_ctx_info) + ctx_info->size; 76 ctx_info = (struct cper_arm_ctx_info )((long)ctx_info + sz); 77 ctx_len += sz; 78 } 79
and similar ones while trying to access section_length on an error dump with too small size.
[ rjw: Subject tweaks ]
{
"affected": [],
"aliases": [
"CVE-2026-43201"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-06T12:16:39Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nAPEI/GHES: ARM processor Error: don\u0027t go past allocated memory\n\nIf the BIOS generates a very small ARM Processor Error, or\nan incomplete one, the current logic will fail to deferrence\n\n\terr-\u003esection_length\nand\n\tctx_info-\u003esize\n\nAdd checks to avoid that. With such changes, such GHESv2\nrecords won\u0027t cause OOPSes like this:\n\n[ 1.492129] Internal error: Oops: 0000000096000005 [#1] SMP\n[ 1.495449] Modules linked in:\n[ 1.495820] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.18.0-rc1-00017-gabadcc3553dd-dirty #18 PREEMPT\n[ 1.496125] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022\n[ 1.496433] Workqueue: kacpi_notify acpi_os_execute_deferred\n[ 1.496967] pstate: 814000c5 (Nzcv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[ 1.497199] pc : log_arm_hw_error+0x5c/0x200\n[ 1.497380] lr : ghes_handle_arm_hw_error+0x94/0x220\n\n0xffff8000811c5324 is in log_arm_hw_error (../drivers/ras/ras.c:75).\n70\t\terr_info = (struct cper_arm_err_info *)(err + 1);\n71\t\tctx_info = (struct cper_arm_ctx_info *)(err_info + err-\u003eerr_info_num);\n72\t\tctx_err = (u8 *)ctx_info;\n73\n74\t\tfor (n = 0; n \u003c err-\u003econtext_info_num; n++) {\n75\t\t\tsz = sizeof(struct cper_arm_ctx_info) + ctx_info-\u003esize;\n76\t\t\tctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + sz);\n77\t\t\tctx_len += sz;\n78\t\t}\n79\n\nand similar ones while trying to access section_length on an\nerror dump with too small size.\n\n[ rjw: Subject tweaks ]",
"id": "GHSA-2439-4xrr-7j2r",
"modified": "2026-05-11T21:31:30Z",
"published": "2026-05-06T12:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43201"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/136093ba4161e0080088abff48273f6830a47766"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/242c652849d979d0133c315a42d9acea0ff88390"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/87880af2d24e62a84ed19943dbdd524f097172f2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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