net/sched: act_ct: preserve tc_skb_cb across defragmentation
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: preserve tc_skb_cb across defragmentation tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through act_ct therefore loses qdisc metadata such as pkt_segs and can trigger WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled. Save and restore the full tc_skb_cb around nf_ct_handle_fragments(), matching the pattern used by ovs_ct_handle_fragments().
CVE-2026-72057
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-2026-72057
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": "0d76daf2013ce1da20eab5e26bd81d983e1c18fb",
"lessThan": "fb080b6f54835d5d4d11ce3122800e6f0f6689e6",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "67d6b00a54446c008f52cf70fc0c2ad0c712f85d",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "2400c4b05d58834b994500a9eec90a37db44187c",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "b3d835407846134b0d54637c0281b39bebef831d",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "f7f45ceb855d9ba1cba594fb3f383255f7013fad",
"versionType": "git"
},
{
"status": "affected",
"version": "ec624fe740b416fb68d536b37fb8eef46f90b5c2",
"lessThan": "9092e15defbe6c7bc241c306093ca9d358a578e7",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.13",
"lessThan": "5.15.217",
"versionType": "semver"
}
],
"programFiles": [
"net/sched/act_ct.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": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"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/sched/act_ct.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72057
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41853 · Revision 1
- Added to Heist Feed
- Publisher date