ghsa-7pr3-9p48-wx7x
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
s390/decompressor: specify __decompress() buf len to avoid overflow
Historically calls to __decompress() didn't specify "out_len" parameter on many architectures including s390, expecting that no writes beyond uncompressed kernel image are performed. This has changed since commit 2aa14b1ab2c4 ("zstd: import usptream v1.5.2") which includes zstd library commit 6a7ede3dfccb ("Reduce size of dctx by reutilizing dst buffer (#2751)"). Now zstd decompression code might store literal buffer in the unwritten portion of the destination buffer. Since "out_len" is not set, it is considered to be unlimited and hence free to use for optimization needs. On s390 this might corrupt initrd or ipl report which are often placed right after the decompressor buffer. Luckily the size of uncompressed kernel image is already known to the decompressor, so to avoid the problem simply specify it in the "out_len" parameter.
{
"affected": [],
"aliases": [
"CVE-2023-52733"
],
"database_specific": {
"cwe_ids": [
"CWE-120"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T16:15:13Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/decompressor: specify __decompress() buf len to avoid overflow\n\nHistorically calls to __decompress() didn\u0027t specify \"out_len\" parameter\non many architectures including s390, expecting that no writes beyond\nuncompressed kernel image are performed. This has changed since commit\n2aa14b1ab2c4 (\"zstd: import usptream v1.5.2\") which includes zstd library\ncommit 6a7ede3dfccb (\"Reduce size of dctx by reutilizing dst buffer\n(#2751)\"). Now zstd decompression code might store literal buffer in\nthe unwritten portion of the destination buffer. Since \"out_len\" is\nnot set, it is considered to be unlimited and hence free to use for\noptimization needs. On s390 this might corrupt initrd or ipl report\nwhich are often placed right after the decompressor buffer. Luckily the\nsize of uncompressed kernel image is already known to the decompressor,\nso to avoid the problem simply specify it in the \"out_len\" parameter.",
"id": "GHSA-7pr3-9p48-wx7x",
"modified": "2024-07-03T18:42:52Z",
"published": "2024-05-21T18:31:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52733"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/16409f7d9ca5bb8220e1049ea9aae0d3c94d2dfb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55dbd6f4ea954751340f4f73d5dcd7c8f12208b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7ab41c2c08a32132ba8c14624910e2fe8ce4ba4b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ed522143f959630f8b7782ddc212900d8f609a9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f1eb22d0ff064ad458b3b1a1eaa84ac3996206c2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.