fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
In the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.
CVE-2026-43112
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43112
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c63433a09d6ae4c226fcbc66da4c58fc189fd746",
"lessThan": "a2ba20c17de8eb028f96b1d85f119d3d25655bd9",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "fbced33599653471b4581dfe1abc7b467031f126",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "5d4fe469fe7dbff7d874c196bb680a82f2625d95",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "86f9c23e0814cfdffda9eedf0c591c51ba209010",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3",
"versionType": "git"
},
{
"status": "affected",
"version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
"lessThan": "78ec5bf2f589ec7fd8f169394bfeca541b077317",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.11",
"lessThan": "5.15.209",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/fs_context.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/fs_context.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43112
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40026 · Revision 1
- Added to Heist Feed
- Publisher date