GHSA-58QM-9WWF-X958
Vulnerability from github – Published: 2026-05-27 12:31 – Updated: 2026-06-01 18:31In the Linux kernel, the following vulnerability has been resolved:
slip: bound decode() reads against the compressed packet length
slhc_uncompress() parses a VJ-compressed TCP header by advancing a pointer through the packet via decode() and pull16(). Neither helper bounds-checks against isize, and decode() masks its return with & 0xffff so it can never return the -1 that callers test for -- those error paths are dead code.
A short compressed frame whose change byte requests optional fields lets decode() read past the end of the packet. The over-read bytes are folded into the cached cstate and reflected into subsequent reconstructed packets.
Make decode() and pull16() take the packet end pointer and return -1 when exhausted. Add a bounds check before the TCP-checksum read. The existing == -1 tests now do what they were always meant to.
{
"affected": [],
"aliases": [
"CVE-2026-45843"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T11:16:23Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nslip: bound decode() reads against the compressed packet length\n\nslhc_uncompress() parses a VJ-compressed TCP header by advancing a\npointer through the packet via decode() and pull16(). Neither helper\nbounds-checks against isize, and decode() masks its return with\n\u0026 0xffff so it can never return the -1 that callers test for -- those\nerror paths are dead code.\n\nA short compressed frame whose change byte requests optional fields\nlets decode() read past the end of the packet. The over-read bytes\nare folded into the cached cstate and reflected into subsequent\nreconstructed packets.\n\nMake decode() and pull16() take the packet end pointer and return -1\nwhen exhausted. Add a bounds check before the TCP-checksum read.\nThe existing == -1 tests now do what they were always meant to.",
"id": "GHSA-58qm-9wwf-x958",
"modified": "2026-06-01T18:31:34Z",
"published": "2026-05-27T12:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45843"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
"type": "CVSS_V3"
}
]
}
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