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CVE-2024-50048 (GCVE-0-2024-50048)

Vulnerability from cvelistv5 – Published: 2024-10-21 19:39 – Updated: 2026-05-11 20:44
VLAI
Title
fbcon: Fix a NULL pointer dereference issue in fbcon_putcs
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: Fix a NULL pointer dereference issue in fbcon_putcs syzbot has found a NULL pointer dereference bug in fbcon. Here is the simplified C reproducer: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open("/dev/fb1", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open("/dev/tty1", O_RDWR, 0); ioctl(fd1, TIOCLINUX, &param); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); return 0; } After calling ioctl(fd1, TIOCLINUX, &param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb) causes the kernel to follow a different execution path: set_con2fb_map -> con2fb_init_display -> fbcon_set_disp -> redraw_screen -> hide_cursor -> clear_selection -> highlight -> invert_screen -> do_update_region -> fbcon_putcs -> ops->putcs Since ops->putcs is a NULL pointer, this leads to a kernel panic. To prevent this, we need to call set_blitting_type() within set_con2fb_map() to properly initialize ops->putcs.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:23 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b07db39584856e16814e2f065380e533a001535d , < 8266ae6eafdcd5a3136592445ff4038bbc7ee80e (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < f7fb5dda555344529ce584ff7a28b109528d2f1b (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < 5b97eebcce1b4f3f07a71f635d6aa3af96c236e7 (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50048\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:17.580\",\"lastModified\":\"2026-06-17T08:03:27.597\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbcon: Fix a NULL pointer dereference issue in fbcon_putcs\\n\\nsyzbot has found a NULL pointer dereference bug in fbcon.\\nHere is the simplified C reproducer:\\n\\nstruct param {\\n\\tuint8_t type;\\n\\tstruct tiocl_selection ts;\\n};\\n\\nint main()\\n{\\n\\tstruct fb_con2fbmap con2fb;\\n\\tstruct param param;\\n\\n\\tint fd = open(\\\"/dev/fb1\\\", 0, 0);\\n\\n\\tcon2fb.console = 0x19;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\tparam.type = 2;\\n\\tparam.ts.xs = 0; param.ts.ys = 0;\\n\\tparam.ts.xe = 0; param.ts.ye = 0;\\n\\tparam.ts.sel_mode = 0;\\n\\n\\tint fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0);\\n\\tioctl(fd1, TIOCLINUX, \u0026param);\\n\\n\\tcon2fb.console = 1;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\treturn 0;\\n}\\n\\nAfter calling ioctl(fd1, TIOCLINUX, \u0026param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb)\\ncauses the kernel to follow a different execution path:\\n\\n set_con2fb_map\\n  -\u003e con2fb_init_display\\n   -\u003e fbcon_set_disp\\n    -\u003e redraw_screen\\n     -\u003e hide_cursor\\n      -\u003e clear_selection\\n       -\u003e highlight\\n        -\u003e invert_screen\\n         -\u003e do_update_region\\n          -\u003e fbcon_putcs\\n           -\u003e ops-\u003eputcs\\n\\nSince ops-\u003eputcs is a NULL pointer, this leads to a kernel panic.\\nTo prevent this, we need to call set_blitting_type() within set_con2fb_map()\\nto properly initialize ops-\u003eputcs.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbcon: soluciona un problema de desreferencia de puntero NULL en fbcon_putcs syzbot ha encontrado un error de desreferencia de puntero NULL en fbcon. Aqu\u00ed est\u00e1 el reproductor C simplificado: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open(\\\"/dev/fb1\\\", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0); ioctl(fd1, TIOCLINUX, \u0026amp;param); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb); devolver 0; } Despu\u00e9s de llamar a ioctl(fd1, TIOCLINUX, \u0026amp;param), el ioctl(fd, FBIOPUT_CON2FBMAP, \u0026amp;con2fb) subsiguiente hace que el n\u00facleo siga una ruta de ejecuci\u00f3n diferente: set_con2fb_map -\u0026gt; con2fb_init_display -\u0026gt; fbcon_set_disp -\u0026gt; redraw_screen -\u0026gt; hide_cursor -\u0026gt; clear_selection -\u0026gt; highlight -\u0026gt; invert_screen -\u0026gt; do_update_region -\u0026gt; fbcon_putcs -\u0026gt; ops-\u0026gt;putcs Dado que ops-\u0026gt;putcs es un puntero NULL, esto lleva a un p\u00e1nico del n\u00facleo. Para evitar esto, necesitamos llamar a set_blitting_type() dentro de set_con2fb_map() para inicializar correctamente ops-\u0026gt;putcs.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/video/fbdev/core/fbcon.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b07db39584856e16814e2f065380e533a001535d\",\"lessThan\":\"8266ae6eafdcd5a3136592445ff4038bbc7ee80e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07db39584856e16814e2f065380e533a001535d\",\"lessThan\":\"f7fb5dda555344529ce584ff7a28b109528d2f1b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07db39584856e16814e2f065380e533a001535d\",\"lessThan\":\"e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07db39584856e16814e2f065380e533a001535d\",\"lessThan\":\"5b97eebcce1b4f3f07a71f635d6aa3af96c236e7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/video/fbdev/core/fbcon.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.113\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.57\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.4\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-22T13:23:51.940299Z\",\"id\":\"CVE-2024-50048\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"180292D6-C3A4-4883-98A3-77F4D56F8081\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.57\",\"matchCriteriaId\":\"05D83DB8-7465-4F88-AFB2-980011992AC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.4\",\"matchCriteriaId\":\"AA84D336-CE9A-4535-B901-1AD77EC17C34\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5b97eebcce1b4f3f07a71f635d6aa3af96c236e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8266ae6eafdcd5a3136592445ff4038bbc7ee80e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f7fb5dda555344529ce584ff7a28b109528d2f1b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:15:01+00:00",
      "cve": "CVE-2024-50048",
      "id": "CVE-2024-50048",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbcon: Fix a NULL pointer dereference issue in fbcon_putcs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50048.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:12:17Z",
      "cve": "CVE-2024-50048",
      "id": "CVE-2024-50048",
      "initial_release_date": "2024-10-22T02:49:42Z",
      "product_status:known_affected": "354",
      "product_status:known_not_affected": "361",
      "product_status:recommended": "638",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-50048",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-50048.json",
      "version": "66"
    },
    "vulnrichment": {
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param.ts.ys = 0;\\n\\tparam.ts.xe = 0; param.ts.ye = 0;\\n\\tparam.ts.sel_mode = 0;\\n\\n\\tint fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0);\\n\\tioctl(fd1, TIOCLINUX, \u0026param);\\n\\n\\tcon2fb.console = 1;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\treturn 0;\\n}\\n\\nAfter calling ioctl(fd1, TIOCLINUX, \u0026param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb)\\ncauses the kernel to follow a different execution path:\\n\\n set_con2fb_map\\n  -\u003e con2fb_init_display\\n   -\u003e fbcon_set_disp\\n    -\u003e redraw_screen\\n     -\u003e hide_cursor\\n      -\u003e clear_selection\\n       -\u003e highlight\\n        -\u003e invert_screen\\n         -\u003e do_update_region\\n          -\u003e fbcon_putcs\\n           -\u003e ops-\u003eputcs\\n\\nSince ops-\u003eputcs is a NULL pointer, this leads to a kernel panic.\\nTo prevent this, we need to call set_blitting_type() within set_con2fb_map()\\nto properly initialize ops-\u003eputcs.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.57\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.4\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T09:13:37.435Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50048\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:24:54.284Z\", \"dateReserved\": \"2024-10-21T12:17:06.072Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T19:39:45.146Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.