bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops (Linux Linux)
En bref
- Source
- NVD
- EPSS
- EPSS 0.12 % · centile 2 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- Linux
- Statut NVD
- Modified
Rechercher sur…
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops When a BPF sock_ops program accesses ctx fields with dst_reg == src_reg, the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the destination register in the !fullsock / !locked_tcp_sock path. Both macros borrow a temporary register to check is_fullsock / is_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the ctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with a request_sock), dst_reg should be zeroed but is not, leaving the stale ctx pointer: - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer, leading to stack-out-of-bounds access in helpers like bpf_skc_to_tcp6_sock(). - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the verifier believes is a SCALAR_VALUE, leaking a kernel pointer. Fix both macros by: - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the added instruction. - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register restore in the !fullsock path, placed after the restore because dst_reg == src_reg means we need src_reg intact to read ctx->temp.
Faiblesses (CWE)
- CWE-125 — Lecture hors limites
Références
- https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb
- https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827
- https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508
- https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39
- https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac
- https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269
- https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8
- https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2026-38946
- GCVE · GCVE-0-2026-53078
Avis du CERT-FR
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1252 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1162 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1069 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1066 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1030 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0956 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0926 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.4.61 < 5.5cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.7.18 < 5.8cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.8.4 < 5.9cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.9.1 < 7.0.10cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| Linux · Linux | affected fd09af010788a884de1c39537c288830c3d305db < db1200ec2c3ddf119d4d9ba67982063df06bbacb ; affected fd09af010788a884de1c39537c288830c3d305db < 4c1c5efd9d1d74743d41ce4e1600501b4feb6827 ; affected fd09af010788a884de1c39537c288830c3d305db < 0e6b30657bbc771f38025c828d722b6162428508 ; affected fd09af010788a884de1c39537c288830c3d305db < 64eaf4ecda007140ddcdb28e00c48c9c69aaba39 ; affected fd09af010788a884de1c39537c288830c3d305db < 2a2c98141e0a75f2d4a7d78b0316c88b3da784ac ; affected fd09af010788a884de1c39537c288830c3d305db < 22400725de070b787cd6d806c5795370ab46d269 |
| Linux · Linux | affected 5.9 ; unaffected 0 < 5.9 ; unaffected 5.10.270 ≤ 5.10.* ; unaffected 5.15.221 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |