net: guard timestamp cmsgs to real error queue skbs
In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.
CVE-2026-53223
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-2026-53223
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": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "24a0d548d3a765cd4558224e4f8e06e14cba26e3",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "71ff5cdd5da61d0438e902aa0fd68c28bc901abe",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "ad9a0374ee6d11048e1f74cd5180bad58b9848b4",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "b903e9b5629ec8dd6db92174070045bf81ad7060",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "e0665b2a8e90bb08bd205062c75662b502d31797",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "3dde4fb941fa5649ab809f6cd3e20e0c424a4e31",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a",
"versionType": "git"
},
{
"status": "affected",
"version": "8605330aac5a5785630aec8f64378a54891937cc",
"lessThan": "1ee90b77b727df903033db873c75caac5c27ec98",
"versionType": "git"
},
{
"status": "affected",
"version": "cdaf15b43bd31003220cb080bcbbd57787a2fca9",
"versionType": "git"
},
{
"status": "affected",
"version": "4.10.14",
"lessThan": "4.11",
"versionType": "semver"
}
],
"programFiles": [
"include/net/sock.h",
"net/core/skbuff.c",
"net/socket.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/sock.h",
"net/core/skbuff.c",
"net/socket.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53223
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40785 · Revision 1
- Added to Heist Feed
- Publisher date