{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-53125", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:24.995Z", "datePublished": "2024-12-04T14:11:09.326Z", "dateUpdated": "2024-12-19T18:32:41.510Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T18:32:41.510Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sync_linked_regs() must preserve subreg_def\n\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n\n 0: call bpf_ktime_get_ns call bpf_ktime_get_ns\n 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff\n 2: w1 = w0 rewrites w1 = w0\n 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r)\n 4: r1 >>= 32 r11 <<= 32 (r)\n 5: r0 = r1 r1 |= r11 (r)\n 6: exit; if w0 < 0xa goto pc+0\n r1 >>= 32\n r0 = r1\n exit\n\n(or zero extension of w1 at (2) is missing for architectures that\n require zero extension for upper register half).\n\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\n for zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\n value for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "dadf82c1b2608727bcc306843b540cd7414055a7", "status": "affected", "versionType": "git"}, {"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "b57ac2d92c1f565743f6890a5b9cf317ed856b09", "status": "affected", "versionType": "git"}, {"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "60fd3538d2a8fd44c41d25088c0ece3e1fd30659", "status": "affected", "versionType": "git"}, {"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84", "status": "affected", "versionType": "git"}, {"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0", "status": "affected", "versionType": "git"}, {"version": "75748837b7e56919679e02163f45d5818c644d03", "lessThan": "e9bd9c498cb0f5843996dbe5cbce7a1836a83c70", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.232", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.175", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.121", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.67", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.6", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7"}, {"url": "https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09"}, {"url": "https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659"}, {"url": "https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84"}, {"url": "https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0"}, {"url": "https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70"}], "title": "bpf: sync_linked_regs() must preserve subreg_def", "x_generator": {"engine": "bippy-5f407fcff5a0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sync_linked_regs() must preserve subreg_def\n\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n\n 0: call bpf_ktime_get_ns call bpf_ktime_get_ns\n 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff\n 2: w1 = w0 rewrites w1 = w0\n 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r)\n 4: r1 >>= 32 r11 <<= 32 (r)\n 5: r0 = r1 r1 |= r11 (r)\n 6: exit; if w0 < 0xa goto pc+0\n r1 >>= 32\n r0 = r1\n exit\n\n(or zero extension of w1 at (2) is missing for architectures that\n require zero extension for upper register half).\n\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\n for zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\n value for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: sync_linked_regs() debe preservar subreg_def La propagaci\u00f3n del rango no debe afectar a las marcas subreg_def, de lo contrario el siguiente ejemplo es reescrito incorrectamente por el verificador cuando el indicador BPF_F_TEST_RND_HI32 est\u00e1 establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 &amp;= 0x7fffffff despu\u00e9s del verificador r0 &amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 &lt; 10 goto +0 --------------&gt; r11 = 0x2f5674a6 (r) 4: r1 &gt;&gt;= 32 r11 &lt;&lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 &lt; 0xa goto pc+0 r1 &gt;&gt;= 32 r0 = r1 salir (o falta la extensi\u00f3n cero de w1 en (2) para arquitecturas que requieren extensi\u00f3n cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 est\u00e1 marcado como no un subreg en (0); - w1 est\u00e1 marcado como subreg en (2); - el subreg_def de w1 es anulado en (3) por copy_register_state(); - w1 se lee en (5) pero mark_insn_zext() no marca (2) para extensi\u00f3n cero, porque el subreg_def de w1 no est\u00e1 configurado; - debido al indicador BPF_F_TEST_RND_HI32, el verificador inserta un valor aleatorio para los bits hi32 de (2) (marcado (r)); - este valor aleatorio se lee en (5)."}], "id": "CVE-2024-53125", "lastModified": "2024-12-19T19:15:07.613", "metrics": {}, "published": "2024-12-04T14:15:20.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: bpf: sync_linked_regs() must preserve subreg_def", "id": "2330351", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2330351"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-682", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: sync_linked_regs() must preserve subreg_def\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n0: call bpf_ktime_get_ns call bpf_ktime_get_ns\n1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff\n2: w1 = w0 rewrites w1 = w0\n3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r)\n4: r1 >>= 32 r11 <<= 32 (r)\n5: r0 = r1 r1 |= r11 (r)\n6: exit; if w0 < 0xa goto pc+0\nr1 >>= 32\nr0 = r1\nexit\n(or zero extension of w1 at (2) is missing for architectures that\nrequire zero extension for upper register half).\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\nfor zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\nvalue for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."], "name": "CVE-2024-53125", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-53125\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53125\nhttps://lore.kernel.org/linux-cve-announce/2024120413-CVE-2024-53125-69ff@gregkh/T"], "statement": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\nFor the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:\ncat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.", "threat_severity": "Low"}