{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-20T01:43:46.322","vulnerabilities":[{"cve":{"id":"CVE-2021-47261","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-05-21T15:15:14.770","lastModified":"2025-04-30T15:03:53.077","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mlx5: Fix initializing CQ fragments buffer\n\nThe function init_cq_frag_buf() can be called to initialize the current CQ\nfragments buffer cq->buf, or the temporary cq->resize_buf that is filled\nduring CQ resize operation.\n\nHowever, the offending commit started to use function get_cqe() for\ngetting the CQEs, the issue with this change is that get_cqe() always\nreturns CQEs from cq->buf, which leads us to initialize the wrong buffer,\nand in case of enlarging the CQ we try to access elements beyond the size\nof the current cq->buf and eventually hit a kernel panic.\n\n [exception RIP: init_cq_frag_buf+103]\n  [ffff9f799ddcbcd8] mlx5_ib_resize_cq at ffffffffc0835d60 [mlx5_ib]\n  [ffff9f799ddcbdb0] ib_resize_cq at ffffffffc05270df [ib_core]\n  [ffff9f799ddcbdc0] llt_rdma_setup_qp at ffffffffc0a6a712 [llt]\n  [ffff9f799ddcbe10] llt_rdma_cc_event_action at ffffffffc0a6b411 [llt]\n  [ffff9f799ddcbe98] llt_rdma_client_conn_thread at ffffffffc0a6bb75 [llt]\n  [ffff9f799ddcbec8] kthread at ffffffffa66c5da1\n  [ffff9f799ddcbf50] ret_from_fork_nospec_begin at ffffffffa6d95ddd\n\nFix it by getting the needed CQE by calling mlx5_frag_buf_get_wqe() that\ntakes the correct source buffer as a parameter."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: IB/mlx5: Corrección al inicializar el búfer de fragmentos CQ. Se puede llamar a la función init_cq_frag_buf() para inicializar el búfer de fragmentos CQ actual cq->buf, o el cq->resize_buf temporal que es rellenado durante la operación de cambio de tamaño de CQ. Sin embargo, la confirmación infractora comenzó a usar la función get_cqe() para obtener los CQE, el problema con este cambio es que get_cqe() siempre devuelve CQE desde cq->buf, lo que nos lleva a inicializar el búfer incorrecto y, en caso de ampliarlo, En el CQ intentamos acceder a elementos más allá del tamaño del cq->buf actual y finalmente entramos en pánico en el kernel. [excepción RIP: init_cq_frag_buf+103] [ffff9f799ddcbcd8] mlx5_ib_resize_cq en fffffffc0835d60 [mlx5_ib] [ffff9f799ddcbdb0] ib_resize_cq en fffffffc05270df [ib_core] [ffff9f799ddcbdc0] _rdma_setup_qp en ffffffffc0a6a712 [llt] [ffff9f799ddcbe10] llt_rdma_cc_event_action en ffffffffc0a6b411 [llt] [ffff9f799ddcbe98] llt_rdma_client_conn_thread en ffffffffc0a6bb75 [llt] [ffff9f799ddcbec8] kthread en ffffffffa66c5da1 [ffff9f799ddcbf50] ret_from_fork_nospec_begin en ffffffffa6d95ddd Arréglelo obteniendo el CQE necesario llamando a mlx5_frag_buf_get_wqe() que toma el búfer de origen correcto como parámetro."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-706"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"4.19.195","matchCriteriaId":"5017B18F-E493-4424-A351-A210614CF65E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.126","matchCriteriaId":"876275F9-BEC7-40E8-9D7F-A20729A4A4FF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.44","matchCriteriaId":"DA547B08-9D25-467B-AD0D-8460FE4EE70D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.12.11","matchCriteriaId":"F914A757-FAFD-407E-9031-21F66635D5EA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*","matchCriteriaId":"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*","matchCriteriaId":"96AC23B2-D46A-49D9-8203-8E1BEDCA8532"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*","matchCriteriaId":"DA610E30-717C-4700-9F77-A3C9244F3BFD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*","matchCriteriaId":"1ECD33F5-85BE-430B-8F86-8D7BD560311D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*","matchCriteriaId":"CF351855-2437-4CF5-AD7C-BDFA51F27683"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1ec2dcd680c71d0d36fa25638b327a468babd5c9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/2ba0aa2feebda680ecfc3c552e867cf4d1b05a3a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/3e670c54eda238cb8a1ea93538a79ae89285c1c4","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/91f7fdc4cc10542ca1045c06aad23365f0d067e0","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/e3ecd9c09fcc10cf6b2bc67e2990c397c40a8c26","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/1ec2dcd680c71d0d36fa25638b327a468babd5c9","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/2ba0aa2feebda680ecfc3c552e867cf4d1b05a3a","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/3e670c54eda238cb8a1ea93538a79ae89285c1c4","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/91f7fdc4cc10542ca1045c06aad23365f0d067e0","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/e3ecd9c09fcc10cf6b2bc67e2990c397c40a8c26","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}