net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again. tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF. tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct (with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream) Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.
- ALSA-2026:49212
- ALSA-2026:49213
- ALSA-2026:49214
- RHSA-2026:47620
- RHSA-2026:48222
- RHSA-2026:49032
- RHSA-2026:49033
- RHSA-2026:49211
- RHSA-2026:49212
- RHSA-2026:49213
- RHSA-2026:49214
- RHSA-2026:55618
- RHSA-2026:55761
- RHSA-2026:55762
- RHSA-2026:55763
- RHSA-2026:55837
- RHSA-2026:56224
- RHSA-2026:56225
- RHSA-2026:67277
- RLSA-2026:49211
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Jul 26, 2026
- Updated
- Aug 17, 2026
- EPSS
- 0.7% · 53th percentile
- CWE
- —
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Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.7%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- f5346df0591d10bc948761ca854b1fae6d2ef441, 6.8affected
- 172ba7d46c202e679f3ccb10264c67416aaeb1c4 and later · before 5ed3d6f85991656667059d3fa5a1d683ac58c447affected · git
- 0b5b831122fc3789fff75be433ba3e4dd7b779d4 and later · before f42e8134a3a1074b834a574d404352f867ba994aaffected · git
- 73f7da5fd124f2cda9161e2e46114915e6e82e97 and later · before 447d493034a9cf7bf13a2abac86d0573d907ec2faffected · git
- 3f14b377d01d8357eba032b4cabc8c1149b458b6 and later · before e1270e69dcf2c3512c453484178f2e9dc0db3f05affected · git
- 3f14b377d01d8357eba032b4cabc8c1149b458b6 and later · before 2140c2f3f2e7b066e1ae616ede8856cafd8015e9affected · git
- 3f14b377d01d8357eba032b4cabc8c1149b458b6 and later · before e28aedab9488343924d227b5a896faed67ce84d5affected · git
- 3f14b377d01d8357eba032b4cabc8c1149b458b6 and later · before a8a02897f2b479127db261de05cbf0c28b98d159affected · git
- 5.15.148 and later · before 5.15.212affected · semver
- 6.1.75 and later · before 6.1.178affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.150.1.el8_10 | 4.18.0-553.150.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.150.1.rt7.491.el8_10 | 4.18.0-553.150.1.rt7.491.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 2140c2f3f2e7b066e1ae616ede8856cafd8015e9 | Vendor (CNA) |
| Linux Linux | 447d493034a9cf7bf13a2abac86d0573d907ec2f | Vendor (CNA) |
| Linux Linux | 5.15.212 | Vendor (CNA) |
| Linux Linux | 5ed3d6f85991656667059d3fa5a1d683ac58c447 | Vendor (CNA) |
| Linux Linux | 6.1.178 | Vendor (CNA) |
| Linux Linux | 6.6.145 | Vendor (CNA) |
| Linux Linux | 6.8 | Vendor (CNA) |
| Linux Linux | a8a02897f2b479127db261de05cbf0c28b98d159 | Vendor (CNA) |
| Linux Linux | e1270e69dcf2c3512c453484178f2e9dc0db3f05 | Vendor (CNA) |
| Linux Linux | e28aedab9488343924d227b5a896faed67ce84d5 | Vendor (CNA) |
| Linux Linux | f42e8134a3a1074b834a574d404352f867ba994a | Vendor (CNA) |
| azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 | 6.6.145.2-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.33.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.180-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.100-1~deb12u1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:6.12.0-55.93.1.el10_0 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:6.12.0-55.93.1.el10_0 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:6.12.0-55.93.1.el10_0 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:6.12.0-55.93.1.el10_0 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
+22
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9
- git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f
- git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447
- git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159
- git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05
- git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5
- git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.