CVE-2026-68337bpf: Reject redirect helpers without a bpf_net_context
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject redirect helpers without a bpf_net_context The bpf_redirect*() helpers and skb_do_redirect() obtain the per-task bpf_redirect_info via bpf_net_ctx_get_ri(), which dereferences the current->bpf_net_context unconditionally. That context is established on the paths that run tc BPF such as sch_handle_{ingress,egress}(), *except* for the case where {cls,act}_bpf was attached to a proper qdisc. A program running from there reaches the NULL deref in two ways: * It calls bpf_redirect() directly, which dereferences the context at the top of the helper: tc qdisc add dev eth0 root handle 1: red limit 1MB min 10KB max 20KB \ avpkt 1000 burst 100 qevent early_drop block 10 tc filter add block 10 pref 1 bpf obj redirect.o * It simply returns TC_ACT_REDIRECT without helper call: tcf_qevent_handle() then dispatches to skb_do_redirect(), which dereferences the context Rather than extending bpf_net_context management into the qdisc path, make the redirect helpers refuse to operate when no context exists, and have tcf_qevent_handle() drop a TC_ACT_REDIRECT verdict instead of calling skb_do_redirect(). Previous behaviour was a crash, so nothing regresses by not supporting it.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 42 days later
· 42 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 3625750f05ecce21a0fce429c1ff85acfffb461b – < 0f2118b757509332bb0e65f90e5233766f14bb88
- affected 3625750f05ecce21a0fce429c1ff85acfffb461b – < aafb093adffad91d4d071e8a7e0dcd9b1d91c94a
- affected 3625750f05ecce21a0fce429c1ff85acfffb461b – < cabfacbd5af09d3ae898ca224c4a1459e9bba15d
- affected 3625750f05ecce21a0fce429c1ff85acfffb461b – < 3f4920d165b29052255527d8ae7619e7ec132ece
- affected 5.9
- unaffected < 5.9
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References4
- https://git.kernel.org/stable/c/0f2118b757509332bb0e65f90e5233766f14bb88 (opens in a new tab)
- https://git.kernel.org/stable/c/aafb093adffad91d4d071e8a7e0dcd9b1d91c94a (opens in a new tab)
- https://git.kernel.org/stable/c/cabfacbd5af09d3ae898ca224c4a1459e9bba15d (opens in a new tab)
- https://git.kernel.org/stable/c/3f4920d165b29052255527d8ae7619e7ec132ece (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55438 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-68337)Record last updated .