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CVE-2026-52939

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <6e4615164d185a26badb2f376a2449f4d174a5f0, <=7.0.*, <=6.12.*, 2.6.37, 6.12.94, <34080db3e70ddf94c38512ad2331e3c3afca6cc1, <2.6.37, 0, 6.1.176, 5.15.210, <=5.10.*, <=6.6.*, <4dd262f875e87653df50b138de1390ab0628e6b7, <dcf458120add64c96a6ef5cf719340453f6e6abf, 7.0.13, <a0148342badd8c9b2e46551766a27cb76c82e715, 6.18.36, <4fd34669558085bcb589aa2078a13b0ca79e360d, 20c72bd5f5f902e5a8745d51573699605bf8d21c, <0f22412a2f4fbbe0251c132abee045d15a90e5b6, 7.1, <=6.18.*, <0f7baa82a24813cdad0b06a6f8f07e4824af5ed5, <=*, <=5.15.*, 6.6.143, 5.10.259

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion rds_ib_xmit_atomic() always programs a masked atomic opcode (IB_WR_MASKED_ATOMIC_CMP_AND_SWP or IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) for every RDS atomic cmsg. But the completion-side switch in rds_ib_send_unmap_op() only handles the non-masked opcodes, so a masked atomic completion falls through to default and returns rm == NULL while send->s_op is left set. rds_ib_send_cqe_handler() then dereferences the NULL rm via rm->m_final_op, oopsing in softirq context. An unprivileged AF_RDS sendmsg() of an atomic cmsg over an active RDS/IB connection triggers it; on hardware that natively accepts masked atomics (mlx4, mlx5) no extra setup is needed. RDS/IB: rds_ib_send_unmap_op: unexpected opcode 0xd in WR! Oops: general protection fault [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197] RIP: rds_ib_send_cqe_handler+0x25c/0xb10 (net/rds/ib_send.c:282) Call Trace: <IRQ> rds_ib_send_cqe_handler (net/rds/ib_send.c:282) poll_scq (net/rds/ib_cm.c:274) rds_ib_tasklet_fn_send (net/rds/ib_cm.c:294) tasklet_action_common (kernel/softirq.c:943) handle_softirqs (kernel/softirq.c:573) run_ksoftirqd (kernel/softirq.c:479) </IRQ> Kernel panic - not syncing: Fatal exception in interrupt Handle the masked atomic opcodes in the same case as the non-masked ones: they map to the same struct rds_message.atomic union member, so the existing container_of()/rds_ib_send_unmap_atomic() body is correct for them.

Gravité et risque d'exploitation

CVE-2026-52939 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 0.12 %, ce qui la place devant 1.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <6e4615164d185a26badb2f376a2449f4d174a5f0, <=7.0.*, <=6.12.*, 2.6.37, 6.12.94, <34080db3e70ddf94c38512ad2331e3c3afca6cc1, <2.6.37, 0, 6.1.176, 5.15.210, <=5.10.*, <=6.6.*, <4dd262f875e87653df50b138de1390ab0628e6b7, <dcf458120add64c96a6ef5cf719340453f6e6abf, 7.0.13, <a0148342badd8c9b2e46551766a27cb76c82e715, 6.18.36, <4fd34669558085bcb589aa2078a13b0ca79e360d, 20c72bd5f5f902e5a8745d51573699605bf8d21c, <0f22412a2f4fbbe0251c132abee045d15a90e5b6, 7.1, <=6.18.*, <0f7baa82a24813cdad0b06a6f8f07e4824af5ed5, <=*, <=5.15.*, 6.6.143, 5.10.259) 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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