CVE-2026-53402 (GCVE-0-2026-53402)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-05 12:35
VLAI
Title
fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font() When fbcon_do_set_font() fails (e.g., due to a memory allocation failure inside vc_resize() under heavy memory pressure), it jumps to the `err_out` label to roll back the console state. However, the current rollback logic forgets to restore the `hi_font` state, leading to a severe state machine corruption. Earlier in the function, `set_vc_hi_font()` might be called to change `vc->vc_hi_font_mask` and mutate the screen buffer. If `vc_resize()` subsequently fails, the `err_out` path restores `vc_font.charcount` but entirely skips rolling back the `vc_hi_font_mask` and the screen buffer. This mismatch leaves the terminal in a desynchronized state. Because `vc_hi_font_mask` remains set, the VT subsystem will still accept character indices greater than 255 from userspace and write them to the screen buffer. Subsequent rendering calls (e.g., `fbcon_putcs()`) will then use these inflated indices to access the reverted, 256-character font array, leading to a deterministic out-of-bounds read and potential kernel memory disclosure. Fix this by adding the missing rollback logic for the `hi_font` mask and screen buffer in the error path.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 868749a7456dc48e93887a8474194e2ee6d6c21f , < cb016bcb40c81e7b19c4ae6143babb366dae8e20 (git)
Affected: ebd6f886aa2447fcfcdce5450c9e1028e1d681bb , < ac562193c36696513ae196171892e9338475c4bc (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 3618a4c5b2591cfa83efe74f5b18c2d02b35c3f5 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < a7a526fbc847f07ad3a503c7382189be5ab68574 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < b5bb2c696e140c399cb874def2feedf61dee27d6 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 076b1aa65f77a49bce5a48a4a55a397cfcafa2b8 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 39815715cbcfabb16fc8c5f4a23deeda20f5df62 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2 (git)
Affected: f08ccb792d3eaf1dc62d8cbf6a30d6522329f660 (git)
Affected: 5.10.249 , < 5.10.261 (semver)
Affected: 5.15.64 , < 5.15.212 (semver)
Affected: 5.19.6 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (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: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()\n\nWhen fbcon_do_set_font() fails (e.g., due to a memory allocation failure\ninside vc_resize() under heavy memory pressure), it jumps to the `err_out`\nlabel to roll back the console state. However, the current rollback logic\nforgets to restore the `hi_font` state, leading to a severe state machine\ncorruption.\n\nEarlier in the function, `set_vc_hi_font()` might be called to change\n`vc-\u003evc_hi_font_mask` and mutate the screen buffer. If `vc_resize()`\nsubsequently fails, the `err_out` path restores `vc_font.charcount`\nbut entirely skips rolling back the `vc_hi_font_mask` and the screen\nbuffer.\n\nThis mismatch leaves the terminal in a desynchronized state. Because\n`vc_hi_font_mask` remains set, the VT subsystem will still accept\ncharacter indices greater than 255 from userspace and write them to the\nscreen buffer. Subsequent rendering calls (e.g., `fbcon_putcs()`) will\nthen use these inflated indices to access the reverted, 256-character\nfont array, leading to a deterministic out-of-bounds read and potential\nkernel memory disclosure.\n\nFix this by adding the missing rollback logic for the `hi_font` mask\nand screen buffer in the error path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
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              "value": "AV:L - The vulnerability is reached only through the KDFONTOP ioctl on a framebuffer-console virtual terminal (/dev/ttyN), which is a local syscall path with no network or physical-access vector.\nAC:L - An attacker who controls a session on an fbcon-backed VT can reliably trigger the bug by issuing a font-change ioctl with different dimensions and a 256\u2194512 glyph transition, then inducing vc_resize() failure through self-controlled memory pressure; no race or victim-dependent timing is required.\nPR:L - KDFONTOP font-set operations require only that the caller owns the controlling TTY (current-\u003esignal-\u003etty == tty), which any unprivileged local user with a console or VT session has; CAP_SYS_TTY_CONFIG is not required on that path.\nUI:N - Exploitation requires only the attacker\u0027s own ioctl and memory-pressure actions on their TTY; no action by another user or administrator is needed.\nS:U - Impact is confined to kernel memory disclosure and potential kernel crash within the same kernel security authority; there is no VM escape, sandbox escape, or cross-security-boundary effect.\nC:H - The desynchronized hi_font_mask causes deterministic out-of-bounds reads from the kernel font glyph buffer during fbcon rendering (e.g., bit_cursor and rotated putcs paths), enabling disclosure of adjacent kernel memory.\nI:N - The flaw is an out-of-bounds read with console state desynchronization; it does not provide an arbitrary kernel write, code execution, or other data-modification primitive.\nA:H - Out-of-bounds reads from kernel font data can cause kernel page faults and oopses, consistent with the prior syzkaller-reported fbcon font/resize failure class that produced unhandled page faults."
            }
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        "dateUpdated": "2026-08-05T12:35:41.953Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/cb016bcb40c81e7b19c4ae6143babb366dae8e20"
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        {
          "url": "https://git.kernel.org/stable/c/ac562193c36696513ae196171892e9338475c4bc"
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          "url": "https://git.kernel.org/stable/c/b5bb2c696e140c399cb874def2feedf61dee27d6"
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          "url": "https://git.kernel.org/stable/c/076b1aa65f77a49bce5a48a4a55a397cfcafa2b8"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2"
        }
      ],
      "title": "fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53402",
    "datePublished": "2026-07-19T12:02:01.795Z",
    "dateReserved": "2026-06-09T07:44:35.403Z",
    "dateUpdated": "2026-08-05T12:35:41.953Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53402",
      "date": "2026-08-11",
      "epss": "0.00135",
      "percentile": "0.03401"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:41:24.000Z",
      "cve": "CVE-2026-53402",
      "id": "msrc_CVE-2026-53402",
      "initial_release_date": "2026-07-20T01:02:01.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53402.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53402\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:51.387\",\"lastModified\":\"2026-07-30T17:42:07.980\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()\\n\\nWhen fbcon_do_set_font() fails (e.g., due to a memory allocation failure\\ninside vc_resize() under heavy memory pressure), it jumps to the `err_out`\\nlabel to roll back the console state. However, the current rollback logic\\nforgets to restore the `hi_font` state, leading to a severe state machine\\ncorruption.\\n\\nEarlier in the function, `set_vc_hi_font()` might be called to change\\n`vc-\u003evc_hi_font_mask` and mutate the screen buffer. If `vc_resize()`\\nsubsequently fails, the `err_out` path restores `vc_font.charcount`\\nbut entirely skips rolling back the `vc_hi_font_mask` and the screen\\nbuffer.\\n\\nThis mismatch leaves the terminal in a desynchronized state. Because\\n`vc_hi_font_mask` remains set, the VT subsystem will still accept\\ncharacter indices greater than 255 from userspace and write them to the\\nscreen buffer. Subsequent rendering calls (e.g., `fbcon_putcs()`) will\\nthen use these inflated indices to access the reverted, 256-character\\nfont array, leading to a deterministic out-of-bounds read and potential\\nkernel memory disclosure.\\n\\nFix this by adding the missing rollback logic for the `hi_font` mask\\nand screen buffer in the error path.\"}],\"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\":\"868749a7456dc48e93887a8474194e2ee6d6c21f\",\"lessThan\":\"cb016bcb40c81e7b19c4ae6143babb366dae8e20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ebd6f886aa2447fcfcdce5450c9e1028e1d681bb\",\"lessThan\":\"ac562193c36696513ae196171892e9338475c4bc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"3618a4c5b2591cfa83efe74f5b18c2d02b35c3f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"a7a526fbc847f07ad3a503c7382189be5ab68574\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"b5bb2c696e140c399cb874def2feedf61dee27d6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"076b1aa65f77a49bce5a48a4a55a397cfcafa2b8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"39815715cbcfabb16fc8c5f4a23deeda20f5df62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24\",\"lessThan\":\"8fdc8c2057eea08d40ce2c8eed41ff9e451c65c2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f08ccb792d3eaf1dc62d8cbf6a30d6522329f660\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.249\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.64\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.19.6\",\"lessThan\":\"5.20\",\"versionType\":\"semver\",\"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\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"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\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.249\",\"versionEndExcluding\":\"5.10.261\",\"matchCriteriaId\":\"B7E36D96-72CA-4974-A809-29C9A2541071\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.64\",\"versionEndExcluding\":\"5.15.212\",\"matchCriteriaId\":\"0D866C5E-CE49-4FE6-9E1A-F7E438921074\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.19.6\",\"versionEndExcluding\":\"6.0\",\"matchCriteriaId\":\"6E53B030-2C91-45B9-91A0-63E897460E68\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.0.1\",\"versionEndExcluding\":\"6.1.178\",\"matchCriteriaId\":\"22C9EAD8-0845-4C82-A958-43F2EDB3B88D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T15:44:48+00:00",
      "cve": "CVE-2026-53402",
      "id": "CVE-2026-53402",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: fbcon: fix out-of-bounds read in err_out of fbcon_do_set_font()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53402.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-10T16:27:49Z",
      "cve": "CVE-2026-53402",
      "id": "CVE-2026-53402",
      "initial_release_date": "2026-07-19T17:35:55Z",
      "product_status:first_fixed": "290",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "79",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53402",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53402.json",
      "version": "10"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.