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CVE-2026-53078

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <db1200ec2c3ddf119d4d9ba67982063df06bbacb, <=6.1.*, <=7.0.*, <=6.12.*, 48be3df15aa19c04eadf156c9129293c9a10389f, 5.15.221, 6.12.101, cd4644d904e1d153d516e73e2e127e7a2fe687e1, <64eaf4ecda007140ddcdb28e00c48c9c69aaba39, 5.10.270, <10f86a2a5c91fc4c4d001960f1c21abe52545ef6, 0, <0e6b30657bbc771f38025c828d722b6162428508, db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef, <5.8, 5.7.18, 6.1.188, a7e52f7f675046d9ffc5692d815fa67c82fcdbf5, 6e0bc946cbeec538322820786b5fb5200a2216ab, <=5.10.*, <=6.6.*, 6.6.157, 6.18.42, <18e3ffde1822f0b48b1753bf34aa97ce839df1d8, fd09af010788a884de1c39537c288830c3d305db, <5.5, 7.1, <=6.18.*, 5.9, 7.0.10, <22400725de070b787cd6d806c5795370ab46d269, <5.9, <2a2c98141e0a75f2d4a7d78b0316c88b3da784ac, <=*, 5.4.61, <=5.15.*, 5.8.4, <4c1c5efd9d1d74743d41ce4e1600501b4feb6827

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.

Gravité et risque d'exploitation

CVE-2026-53078 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.12 %, ce qui la place devant 1.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <db1200ec2c3ddf119d4d9ba67982063df06bbacb, <=6.1.*, <=7.0.*, <=6.12.*, 48be3df15aa19c04eadf156c9129293c9a10389f, 5.15.221, 6.12.101, cd4644d904e1d153d516e73e2e127e7a2fe687e1, <64eaf4ecda007140ddcdb28e00c48c9c69aaba39, 5.10.270, <10f86a2a5c91fc4c4d001960f1c21abe52545ef6, 0, <0e6b30657bbc771f38025c828d722b6162428508, db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef, <5.8, 5.7.18, 6.1.188, a7e52f7f675046d9ffc5692d815fa67c82fcdbf5, 6e0bc946cbeec538322820786b5fb5200a2216ab, <=5.10.*, <=6.6.*, 6.6.157, 6.18.42, <18e3ffde1822f0b48b1753bf34aa97ce839df1d8, fd09af010788a884de1c39537c288830c3d305db, <5.5, 7.1, <=6.18.*, 5.9, 7.0.10, <22400725de070b787cd6d806c5795370ab46d269, <5.9, <2a2c98141e0a75f2d4a7d78b0316c88b3da784ac, <=*, 5.4.61, <=5.15.*, 5.8.4, <4c1c5efd9d1d74743d41ce4e1600501b4feb6827) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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