{"id":"CVE-2026-97953","revision":"0b9628a814bb48c9b389849011047e89","records":[{"revision":"0b9628a814bb48c9b389849011047e89","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97953","aliases":[],"title":"net: stmmac: fix TX descriptor availability check for TSO traffic","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: fix TX descriptor availability check for TSO traffic\n\nstmmac_tso_xmit() estimates the number of free TX descriptors required by\na TSO skb as:\n\n\t(skb->len - proto_hdr_len) / TSO_MAX_BUFF_SIZE + 1\n\nwhich assumes the payload is split into TSO_MAX_BUFF_SIZE chunks. This\nunderestimates the descriptors actually consumed by stmmac_tso_allocator(),\nsince each fragment is mapped individually and so it needs at least one\ndescriptor regardless of its size. Moreover, one descriptor is used for\nthe L2/L3/L4 headers and, when the MSS changes, one more is consumed for\nthe MSS context descriptor.\nFor a highly fragmented TSO skb the check can therefore pass even when the\nring has too few free slots. stmmac_tso_allocator() then writes past the\navailable descriptors, overwriting descriptors still owned by the DMA\nengine, corrupting the TX ring.\nAdd stmmac_tso_get_num_desc() to compute the exact number of descriptors\nneeded for the header, the linear payload and each fragment, plus the MSS\ncontext descriptor when required, and use it in the availability check.","state":0,"publishedAt":"2026-09-25T10:23:00.758+00:00","modifiedAt":"2026-10-21T12:53:49.828+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/stmicro/stmmac/stmmac_main.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f748be531d7012c456b97f66091d86b3675c5fef\",\n                            \"lessThan\": \"09c30547da2c45bb79f7d3adffc860af332c2d42\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f748be531d7012c456b97f66091d86b3675c5fef\",\n                            \"lessThan\": \"ffa6d2481bc1c87f822ecd626561484e4ee24cef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f748be531d7012c456b97f66091d86b3675c5fef\",\n                            \"lessThan\": \"c28175220f808c867d5618de8ecc6dbcc815c773\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f748be531d7012c456b97f66091d86b3675c5fef\",\n                            \"lessThan\": \"65820fc743eae322f7f94f6a64d07861211d4b21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f748be531d7012c456b97f66091d86b3675c5fef\",\n                            \"lessThan\": \"5e38d732ec67a5b1f9a56e6c73add480c4b6030a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/stmicro/stmmac/stmmac_main.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/09c30547da2c45bb79f7d3adffc860af332c2d42","https://git.kernel.org/stable/c/ffa6d2481bc1c87f822ecd626561484e4ee24cef","https://git.kernel.org/stable/c/c28175220f808c867d5618de8ecc6dbcc815c773","https://git.kernel.org/stable/c/65820fc743eae322f7f94f6a64d07861211d4b21","https://git.kernel.org/stable/c/5e38d732ec67a5b1f9a56e6c73add480c4b6030a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97953","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97953","identifiers":["CVE-2026-97953"]},"retained":false,"historicalAffected":[]}],"coverage":[]}