rxrpc: serialize kernel accept preallocation with socket teardown
In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.
CVE-2026-74436
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-2026-74436
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": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "d6207326b4ca0ae1041281b6af9df53f8080669a",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "11b429b84c87cb5a0152f14e7d6cb649ed363901",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "c20d983968f239574290cf804a58cde18ad1c559",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "0337cdba0c477f176c0459bed012109453184573",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "35a967ff8b24db09ee429c39c5b5e6571639997d",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "1741378a7a83dfd8e53a9196730df709b903cd33",
"versionType": "git"
},
{
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"lessThan": "dc175389b18c29a5303ee83169ec653adfae3e17",
"versionType": "git"
}
],
"programFiles": [
"net/rxrpc/call_accept.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/rxrpc/call_accept.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74436
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33150 · Revision 1
- Added to Heist Feed
- Publisher date