367 lines
17 KiB
JSON
367 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-19548",
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"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"state": "PUBLISHED",
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"assignerShortName": "redhat",
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"dateReserved": "2026-08-11T14:15:00.089Z",
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"datePublished": "2026-08-12T15:51:39.126Z",
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"dateUpdated": "2026-11-06T07:42:33.871Z"
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},
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"containers": {
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"cna": {
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"title": "Binutils: binutils: multiple use-after-free in add_archive_element via lto plugin processing",
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"metrics": [
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{
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"other": {
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"value": "Moderate",
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},
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"type": "Red Hat severity rating"
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}
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},
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "LOCAL",
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"availabilityImpact": "HIGH",
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"baseScore": 5.5,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "REQUIRED",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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"version": "3.1"
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},
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"format": "CVSS"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "Multiple Use-After-Free vulnerabilities were found in the add_archive_element function in ld/ldmain.c of the GNU linker (ld), a component of binutils. The root cause is that plugin_maybe_claim() in ld/plugin.c frees the original BFD object via bfd_close/_bfd_delete_bfd when entry->the_bfd->my_archive == NULL, but the caller retains both the original abfd parameter and a shallow copy (orig_input.the_bfd) as dangling pointers. These dangling pointers are subsequently dereferenced at three distinct locations in add_archive_element:\n\n1. Line ~1442: accessing abfd->my_archive via bfd_usrdata(abfd->my_archive)\n2. Line ~1493: multiple accesses to abfd and abfd->my_archive in a conditional check and bfd_get_filename call\n3. Line ~1525: dereferencing the shallow copy orig_input.the_bfd->my_archive in trace/verbose logging\n\nThe vulnerability is triggered when LTO plugins are active (link_info.lto_plugin_active is true) and the input object has abfd->my_archive == NULL, which is a valid state for standalone object files. Red Hat builds binutils with --enable-plugins and --enable-lto, confirming the vulnerable code path is compiled in and reachable.\n\nAn attacker who can supply a crafted object or archive file to a build process using LTO-enabled linking could exploit this flaw to cause a denial of service (linker crash via segmentation fault). Arbitrary code execution is theoretically possible through heap manipulation but is substantially mitigated by hardening measures including stack protector, FORTIFY_SOURCE, ASLR, and PIE.\n\nThe attack surface is limited to build-time environments — the linker is a development tool not exposed in production runtime. The most realistic exploitation scenario is a supply chain attack introducing a crafted object file as a build dependency in CI/CD pipelines or development environments."
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}
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],
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"version": "2.46.1-1.4.hum1",
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"lessThan": "*",
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"versionType": "rpm",
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"status": "unaffected"
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"packageName": "binutils",
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"packageName": "binutils",
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:82359",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-416",
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{
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"lang": "en",
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"value": "Build environments should avoid running LTO-enabled linking (ld with plugin support) against untrusted or externally-supplied object and archive files. The linker is a build-time tool, not present in production runtimes, so the realistic exposure is to CI/CD pipelines and developer workstations that build from untrusted or externally-contributed sources (supply-chain style attack). Standard hardening measures (ASLR, stack protector, FORTIFY_SOURCE, PIE) substantially reduce the likelihood of arbitrary code execution via heap manipulation, limiting the more realistic impact to a linker crash (denial of service)."
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}
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],
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"timeline": [
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{
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"lang": "en",
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"time": "2026-06-10T00:00:00.000Z",
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"credits": [
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{
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"lang": "en",
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"value": "Red Hat would like to thank Xuqing Yang (Individual Security Researcher (rigelyoung@icloud.com)) for reporting this issue."
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}
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],
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"metrics": [
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"timestamp": "2026-08-12T16:52:48.222617Z",
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"id": "CVE-2026-19548",
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"options": [
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"Exploitation": "none"
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{
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"Automatable": "no"
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},
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