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CVE-2026-80983

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <5.11, <=6.1.*, <=6.12.*, 5.15.221, 5.14.14, 0, 7.2.4, 6.1.188, <=6.6.*, <5.15, 6.6.157, <d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d, 5.15, <=6.18.*, <d9a879ac25958bdaecb669ce70e58f8e2ff170de, <a3378466704e0bbe93aef9769552dca7673a7eb6, <84dea0585f6b538ae895a8b1d025f4897737f3b1, <=7.2.*, 5.10.90, <e20227019d9da73f8fdf16f0951c2e188c84933f, <=*, <719296c4aa8213d4ac8002e77d5956d436bc98d0, 99f19566b1c4d3dc4d934ee2ef43faadebb56d70, <=5.15.*, 0d9ddf515cde793841f738490037560fd6559c63, <09d7a9e162ee1a269878c126aee3d7eff43e4130, 6.18.50, 6.12.109, 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix socket refcount leak in smc_switch_conns() smc_switch_conns() takes a reference on the SMC socket before dropping lgr->conns_lock, so the connection stays alive while the CDC slot is fetched: sock_hold(&smc->sk); read_unlock_bh(&lgr->conns_lock); /* pre-fetch buffer outside of send_lock, might sleep */ rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); if (rc) goto err_out; The err_out label only drops the wr_tx link reference, so this early exit returns without the matching sock_put(). The second error exit is not affected, because sock_put() has already run by then. A leaked sk_refcnt means the smc_sock is never destroyed. Its send and receive buffers stay allocated, and for a user socket the reference held on the network namespace is never released, so the netns can no longer be torn down. smc_cdc_get_free_slot() fails when the target link goes down or when the connection has been killed while the switch is in progress. Both are reachable during the link failover this function implements, so the leak is triggered by the same hardware events that make smc_switch_conns() run in the first place. Restructure so there is a single sock_put() covering both outcomes, instead of adding a second one to the error path.

Gravité et risque d'exploitation

CVE-2026-80983 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 6.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <5.11, <=6.1.*, <=6.12.*, 5.15.221, 5.14.14, 0, 7.2.4, 6.1.188, <=6.6.*, <5.15, 6.6.157, <d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d, 5.15, <=6.18.*, <d9a879ac25958bdaecb669ce70e58f8e2ff170de, <a3378466704e0bbe93aef9769552dca7673a7eb6, <84dea0585f6b538ae895a8b1d025f4897737f3b1, <=7.2.*, 5.10.90, <e20227019d9da73f8fdf16f0951c2e188c84933f, <=*, <719296c4aa8213d4ac8002e77d5956d436bc98d0, 99f19566b1c4d3dc4d934ee2ef43faadebb56d70, <=5.15.*, 0d9ddf515cde793841f738490037560fd6559c63, <09d7a9e162ee1a269878c126aee3d7eff43e4130, 6.18.50, 6.12.109, 95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a, 7.3) 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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