{
  "cveId": "CVE-2026-23316",
  "url": "https://patchblox.com/security/cve/CVE-2026-23316",
  "summary": "CVE-2026-23316 is fixed in 80 products on 1 platform, first by DEBIAN-CVE-2026-23316, released March 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: ipv4: fix ARM64 alignment fault in multipat...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: ipv4: fix ARM64 alignment fault in multipath hash seed  \u0060struct sysctl_fib_multipath_hash_seed\u0060 contains two u32 fields (user_seed and mp_seed), making it an 8-byte structure with a 4-byte alignment requirement.  In \u0060fib_multipath_hash_from_keys()\u0060, the code evaluates the entire struct atomically via \u0060READ_ONCE()\u0060:      mp_seed = READ_ONCE(net-\u003Eipv4.sysctl_fib_multipath_hash_seed).mp_seed;  While this silently works on GCC by falling back to unaligned regular loads which the ARM64 kernel tolerates, it causes a fatal kernel panic when compiled with Clang and LTO enabled.  Commit e35123d83ee3 (\u0022arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y\u0022) strengthens \u0060READ_ONCE()\u0060 to use Load-Acquire instructions (\u0060ldar\u0060 / \u0060ldapr\u0060) to prevent compiler reordering bugs under Clang LTO. Since the macro evaluates the full 8-byte struct, Clang emits a 64-bit \u0060ldar\u0060 instruction. ARM64 architecture strictly requires \u0060ldar\u0060 to be naturally aligned, thus executing it on a 4-byte aligned address triggers a strict Alignment Fault (FSC = 0x21).  Fix the read side by moving the \u0060READ_ONCE()\u0060 directly to the \u0060u32\u0060 member, which emits a safe 32-bit \u0060ldar Wn\u0060.  Furthermore, Eric Dumazet pointed out that \u0060WRITE_ONCE()\u0060 on the entire struct in \u0060proc_fib_multipath_hash_set_seed()\u0060 is also flawed. Analysis shows that Clang splits this 8-byte write into two separate 32-bit \u0060str\u0060 instructions. While this avoids an alignment fault, it destroys atomicity and exposes a tear-write vulnerability. Fix this by explicitly splitting the write into two 32-bit \u0060WRITE_ONCE()\u0060 operations.  Finally, add the missing \u0060READ_ONCE()\u0060 when reading \u0060user_seed\u0060 in \u0060proc_fib_multipath_hash_seed()\u0060 to ensure proper pairing and concurrency safety.",
  "published": "2026-03-25T11:16:28Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00127,
  "epssPercentile": 0.02369,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}