bpf: Check skb->transport_header is set in bpf_skb_check_mtu (Linux Linux)

CVE-2025-68363
Non disponible

En bref

Source
NVD
EPSS
EPSS 0.21 % · centile 12 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Check skb->transport_header is set in bpf_skb_check_mtu The bpf_skb_check_mtu helper needs to use skb->transport_header when the BPF_MTU_CHK_SEGS flag is used: bpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS) The transport_header is not always set. There is a WARN_ON_ONCE report when CONFIG_DEBUG_NET is enabled + skb->gso_size is set + bpf_prog_test_run is used: WARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071 skb_gso_validate_network_len bpf_skb_check_mtu bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch bpf_test_run bpf_prog_test_run_skb For a normal ingress skb (not test_run), skb_reset_transport_header is performed but there is plan to avoid setting it as described in commit 2170a1f09148 ("net: no longer reset transport_header in __netif_receive_skb_core()"). This patch fixes the bpf helper by checking skb_transport_header_was_set(). The check is done just before skb->transport_header is used, to avoid breaking the existing bpf prog. The WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.

Références

Références européennes

Avis du CERT-FR

Produits affectés

ProduitVersions
Linux · Linuxaffected 34b2021cc61642d61c3cf943d9e71925b827941b < b3171a5e4622e915e94599a55f4964078bdec27e ; affected 34b2021cc61642d61c3cf943d9e71925b827941b < 97b876fa88322625228792cf7a5fd77531815a80 ; affected 34b2021cc61642d61c3cf943d9e71925b827941b < 30ce906557a21adef4cba5901c8e995dc18263a9 ; affected 34b2021cc61642d61c3cf943d9e71925b827941b < 1c30e4afc5507f0069cc09bd561e510e4d97fbf7 ; affected 34b2021cc61642d61c3cf943d9e71925b827941b < 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 ; affected 34b2021cc61642d61c3cf943d9e71925b827941b < d946f3c98328171fa50ddb908593cf833587f725
Linux · Linuxaffected 5.12 ; unaffected 0 < 5.12 ; unaffected 6.1.160 ≤ 6.1.* ; unaffected 6.6.120 ≤ 6.6.* ; unaffected 6.12.63 ≤ 6.12.* ; unaffected 6.17.13 ≤ 6.17.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD