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CVE-2026-72428 (GCVE-0-2026-72428)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:14
VLAI
Title
bpf: Fix stack slot index in nospec checks
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack slot index in nospec checks check_stack_write_fixed_off() computes the byte slot for a fixed-offset stack write as -off - 1, and records each written byte in slot_type[] with (slot - i) % BPF_REG_SIZE. The Spectre v4 sanitization pre-check uses slot_type[i] instead. For a 4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the pre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates bytes 7..4. That can leave the second half-slot write without nospec_result even though the bytes being overwritten still require sanitization. Use the same slot index in the sanitization pre-check that the write path uses when updating slot_type[].
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0e9280654aa482088ee6ef3deadef331f5ac5fb0 , < e62268e695075a481a6c4feeb022c19cf57422a6 (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < a71eb8f730a91271cf47ce291e785b6b7e54622f (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < ca119656baa8f48a56e0c2f3ab63fdd33ca9e307 (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < 475405593de2b796224c6297aece44f321195919 (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < f1471aa76d74e0df3b2a90731ca0208f498c670b (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < 68b41e68a62299f26cb16af422b5c7d1c69dafd9 (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < db8f1dcf5950b91886b9df4270bc816370d292c1 (git)
Affected: 2039f26f3aca5b0e419b98f65dd36481337b86ee , < d1d53aa30ab3b5ae89161c9cc840b3f7489ad386 (git)
Affected: 872968502114d68c21419cf7eb5ab97717e7b803 (git)
Affected: f5893af2704eb763eb982f01d573f5b19f06b623 (git)
Affected: 0b27bdf02c400684225ee5ee99970bcbf5082282 (git)
Affected: 5.10.56 , < 5.10.261 (semver)
Affected: 4.19.207 , < 4.20 (semver)
Affected: 5.4.146 , < 5.5 (semver)
Affected: 5.13.8 , < 5.14 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack slot index in nospec checks\n\ncheck_stack_write_fixed_off() computes the byte slot for a fixed-offset\nstack write as -off - 1, and records each written byte in slot_type[] with\n(slot - i) % BPF_REG_SIZE.\n\nThe Spectre v4 sanitization pre-check uses slot_type[i] instead. For a\n4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the\npre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates\nbytes 7..4. That can leave the second half-slot write without nospec_result\neven though the bytes being overwritten still require sanitization.\n\nUse the same slot index in the sanitization pre-check that the write path uses\nwhen updating slot_type[]."
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        "shortName": "Linux"
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That can leave the second half-slot write without nospec_result\\neven though the bytes being overwritten still require sanitization.\\n\\nUse the same slot index in the sanitization pre-check that the write path uses\\nwhen updating slot_type[].\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/verifier.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0e9280654aa482088ee6ef3deadef331f5ac5fb0\",\"lessThan\":\"e62268e695075a481a6c4feeb022c19cf57422a6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"a71eb8f730a91271cf47ce291e785b6b7e54622f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"ca119656baa8f48a56e0c2f3ab63fdd33ca9e307\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"475405593de2b796224c6297aece44f321195919\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"f1471aa76d74e0df3b2a90731ca0208f498c670b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"68b41e68a62299f26cb16af422b5c7d1c69dafd9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"db8f1dcf5950b91886b9df4270bc816370d292c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2039f26f3aca5b0e419b98f65dd36481337b86ee\",\"lessThan\":\"d1d53aa30ab3b5ae89161c9cc840b3f7489ad386\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872968502114d68c21419cf7eb5ab97717e7b803\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f5893af2704eb763eb982f01d573f5b19f06b623\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0b27bdf02c400684225ee5ee99970bcbf5082282\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.56\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.207\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.146\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.13.8\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/verifier.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T12:29:25+00:00",
      "cve": "CVE-2026-72428",
      "id": "CVE-2026-72428",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix stack slot index in nospec checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72428.json",
      "version": "3"
    }
  }
}



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