{"id":"CVE-2025-71120","title":"SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf\n\nA zero length gss_token results in pages == 0 and in_token->pages[0]\nis NULL. The…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a8f1e445ce3545c90d69c9e8ff8f7821825fe810","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < f9e53f69ac3bc4ef568b08d3542edac02e83fefd","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 7452d53f293379e2c38cfa8ad0694aa46fc4788b","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a2c6f25ab98b423f99ccd94874d655b8bcb01a19","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 1c8bb965e9b0559ff0f5690615a527c30f651dd8","Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < d4b69a6186b215d2dc1ebcab965ed88e8d41768d","Linux 66ed7b413d31c6ff23901ac4443b1cc1af2f6113","Linux 7be8c165dc81564705e8e0b72d398ef708f67eaa","Linux >= 4.19.99 < 4.20","Linux >= 5.4.15 < 5.5","Linux 5.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:42:25.150500Z"},"published":"2026-01-14","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:43:58.946Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71120","references":[{"url":"https://git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810"},{"url":"https://git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d"},{"url":"https://git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd"},{"url":"https://git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788b"},{"url":"https://git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19"},{"url":"https://git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8"},{"url":"https://git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768d"}],"tags":["cve.org"],"epss":0.00484,"epssPercentile":0.40802,"ingestedAt":"2026-09-08T15:33:26.995Z","slug":"CVE-2025-71120","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf\n\nA zero length gss_token results in pages == 0 and in_token->pages[0]\nis NULL. The code unconditionally evaluates\npage_address(in_token->pages[0]) for the initial memcpy, which can\ndereference NULL even when the copy length is 0. Guard the first\nmemcpy so it only runs when length > 0.\n\n## Affected\n\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a8f1e445ce3545c90d69c9e8ff8f7821825fe810`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < f9e53f69ac3bc4ef568b08d3542edac02e83fefd`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 7452d53f293379e2c38cfa8ad0694aa46fc4788b`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a2c6f25ab98b423f99ccd94874d655b8bcb01a19`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 1c8bb965e9b0559ff0f5690615a527c30f651dd8`\n- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < d4b69a6186b215d2dc1ebcab965ed88e8d41768d`\n- `Linux 66ed7b413d31c6ff23901ac4443b1cc1af2f6113`\n- `Linux 7be8c165dc81564705e8e0b72d398ef708f67eaa`\n- `Linux >= 4.19.99 < 4.20`\n- `Linux >= 5.4.15 < 5.5`\n- `Linux 5.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}