CVE-2023-54020
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: pdma_desc memory leak fix Commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel") changed sf_pdma_prep_dma_memcpy() to unconditionally allocate a new sf_pdma_desc each time it is called. The driver previously recycled descs, by checking the in_use flag, only allocating additional descs if the existing one was in use. This logic was removed in commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel"), but sf_pdma_free_desc() was not changed to handle the new behaviour. As a result, each time sf_pdma_prep_dma_memcpy() is called, the previous descriptor is leaked, over time leading to memory starvation: unreferenced object 0xffffffe008447300 (size 192): comm "irq/39-mchp_dsc", pid 343, jiffies 4294906910 (age 981.200s) hex dump (first 32 bytes): 00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00 ................ 00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00 ..p............. backtrace: [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28 [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178 [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112 Add the missing kfree() to sf_pdma_free_desc(), and remove the redundant in_use flag.
Gravité et risque d'exploitation
CVE-2023-54020 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 0.19 %, ce qui la place devant 8.6 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <5.11, <=6.1.*, 5ab2782c944e324008ef5d658f2494a9f0e3c5ac, <03fece43fa109beba7cc9948c02f5e2d1205d607, 6.1.16, <8bd5040bd43f2b5ba3c898b09a3197a0c7ace126, 0, 5.19.2, b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11, a93b3f1e11971a91b6441b6d47488f4492cc113f, <b02e07015a5ac7bbc029da931ae17914b8ae0339, 6.0, 5.10.137, 6.2.3, <6.0, 6.3, 5.15.99, <5.15.99, 5.15.61, <=6.2.*, <5.20, <5.19, 4c7350b1dd8a192af844de32fc99b9e34c876fda, 5.18.18, b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc, <=*, <=5.15.*, <ad222c9af25e3f074c180e389b3477dce42afc4f) 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.