{"id":"OESA-2025-2312","summary":"kernel security update","details":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Validate i_depth for exhash directories\n\nA fuzzer test introduced corruption that ends up with a depth of 0 in\ndir_e_read(), causing an undefined shift by 32 at:\n\n  index = hash >> (32 - dip->i_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is\ninvalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time.\n\nSo we can avoid the undefined behaviour by checking for depth values\nlower than the minimum in gfs2_dinode_in(). Values greater than the\nmaximum are already being checked for there.\n\nAlso switch the calculation in dir_make_exhash() to use ilog2() to\nclarify how the depth is calculated.\n\nTested with the syzkaller repro.c and xfstests '-g quick'.(CVE-2025-38710)","modified":"2026-08-18T01:19:58.407182856Z","published":"2025-09-19T11:09:23Z","upstream":["CVE-2025-38710"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2312"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38710"}],"affected":[{"package":{"name":"kernel","ecosystem":"openEuler:20.03-LTS-SP4","purl":"pkg:rpm/openEuler/kernel&distro=openEuler-20.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.19.90-2509.5.0.0344.oe2003sp4"}]}],"ecosystem_specific":{"aarch64":["bpftool-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","bpftool-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-debugsource-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-devel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-source-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-tools-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-tools-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","kernel-tools-devel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","python2-perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","python2-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","python3-perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm","python3-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm"],"src":["kernel-4.19.90-2509.5.0.0344.oe2003sp4.src.rpm"],"x86_64":["bpftool-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","bpftool-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-debugsource-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-devel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-source-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-tools-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-tools-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","kernel-tools-devel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","python2-perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","python2-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","python3-perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm","python3-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2025-2312.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}