CVE-2026-64530

Enriched by CISA
 

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.
https://nvd.nist.gov/vuln/detail/CVE-2026-64530

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 172ba7d46c202e679f3ccb10264c67416aaeb1c4 < 5ed3d6f85991656667059d3fa5a1d683ac58c447 [affected]
  • 0b5b831122fc3789fff75be433ba3e4dd7b779d4 < f42e8134a3a1074b834a574d404352f867ba994a [affected]
  • 73f7da5fd124f2cda9161e2e46114915e6e82e97 < 447d493034a9cf7bf13a2abac86d0573d907ec2f [affected]
  • 3f14b377d01d8357eba032b4cabc8c1149b458b6 < e1270e69dcf2c3512c453484178f2e9dc0db3f05 [affected]
  • 3f14b377d01d8357eba032b4cabc8c1149b458b6 < 2140c2f3f2e7b066e1ae616ede8856cafd8015e9 [affected]
  • 3f14b377d01d8357eba032b4cabc8c1149b458b6 < e28aedab9488343924d227b5a896faed67ce84d5 [affected]
  • 3f14b377d01d8357eba032b4cabc8c1149b458b6 < a8a02897f2b479127db261de05cbf0c28b98d159 [affected]
  • f5346df0591d10bc948761ca854b1fae6d2ef441 [affected]
  • 5.15.148 < 5.15.212 [affected]
  • 6.1.75 < 6.1.178 [affected]
  • 6.6.14 < 6.6.145 [affected]
  • 6.7.2 < 6.8 [affected]
Linux Linux
  • 6.8 [affected]
  • < 6.8 [unaffected]
  • 5.15.212 ≤ 5.15.* [unaffected]
  • 6.1.178 ≤ 6.1.* [unaffected]
  • 6.6.145 ≤ 6.6.* [unaffected]
  • 6.12.97 ≤ 6.12.* [unaffected]
  • 6.18.40 ≤ 6.18.* [unaffected]
  • 7.1.5 ≤ 7.1.* [unaffected]
  • 7.2-rc1 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.15.148 < 5.15.212
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.1.75 < 6.1.178
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.6.14 < 6.6.145
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.8 < 6.12.97
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.8 < 6.18.40
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.8 < 7.1.5
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.8 < 7.2-rc1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.7.2

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry