xsk: fix refcount underflow in error path
In the Linux kernel, the following vulnerability has been resolved: xsk: fix refcount underflow in error path Fix a refcount underflow problem reported by syzbot that can happen when a system is running out of memory. If xp_alloc_tx_descs() fails, and it can only fail due to not having enough memory, then the error path is triggered. In this error path, the refcount of the pool is decremented as it has incremented before. However, the reference to the pool in the socket was not nulled. This means that when the socket is closed later, the socket teardown logic will think that there is a pool attached to the socket and try to decrease the refcount again, leading to a refcount underflow. I chose this fix as it involved adding just a single line. Another option would have been to move xp_get_pool() and the assignment of xs->pool to after the if-statement and using xs_umem->pool instead of xs->pool in the whole if-statement resulting in somewhat simpler code, but this would have led to much more churn in the code base perhaps making it harder to backport.
CVE-2023-53698
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-2023-53698
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": "f7019562f142bc041f9cde63af338d1886585923",
"lessThan": "789fcd94c9cac133dd4d96e193188661aca9f6c3",
"versionType": "git"
},
{
"status": "affected",
"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
"lessThan": "15b453cf7348973217558235b9ece2ee5fea6777",
"versionType": "git"
},
{
"status": "affected",
"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
"lessThan": "3e7722c31d4167eb7f3ffd35aba52cab69b79072",
"versionType": "git"
},
{
"status": "affected",
"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
"lessThan": "85c2c79a07302fe68a1ad5cc449458cc559e314d",
"versionType": "git"
},
{
"status": "affected",
"version": "9f0c8a9d4ef1b9ebee0e4ac2495fe790727044aa",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.47",
"lessThan": "5.15.127",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.17.15",
"lessThan": "5.18",
"versionType": "semver"
}
],
"programFiles": [
"net/xdp/xsk.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.127",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.46",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.4.11",
"versionType": "semver",
"lessThanOrEqual": "6.4.*"
},
{
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xdp/xsk.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2023-53698
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30307 · Revision 1
- Added to Heist Feed
- Publisher date