sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used.
CVE-2025-21640
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-2025-21640
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": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "5599b212d2f4466e1832a94e9932684aaa364587",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "03ca51faba2b017bf6c90e139434c4117d0afcdc",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "86ddf8118123cb58a0fb8724cad6979c4069065b",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "3cd0659deb9c03535fd61839e91d4d4d3e51ac71",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "ad673e514b2793b8d5902f6ba6ab7e890dea23d5",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "f0bb3935470684306e4e04793a20ac4c4b08de0b",
"versionType": "git"
},
{
"status": "affected",
"version": "3c68198e75111a905ac2412be12bf7b29099729b",
"lessThan": "ea62dd1383913b5999f3d16ae99d411f41b528d4",
"versionType": "git"
}
],
"programFiles": [
"net/sctp/sysctl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.292",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.234",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.177",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.125",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.72",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.10",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sctp/sysctl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21640
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30424 · Revision 1
- Added to Heist Feed
- Publisher date