Vulnerability-Lookup

FKIE_CVE-2026-31521

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-04-28 18:26

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: module: Fix kernel panic when a symbol st_shndx is out of bounds The module loader doesn't check for bounds of the ELF section index in simplify_symbols(): for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { const char *name = info->strtab + sym[i].st_name; switch (sym[i].st_shndx) { case SHN_COMMON: [...] default: /* Divert to percpu allocation if a percpu var. */ if (sym[i].st_shndx == info->index.pcpu) secbase = (unsigned long)mod_percpu(mod); else /** HERE --> **/ secbase = info->sechdrs[sym[i].st_shndx].sh_addr; sym[i].st_value += secbase; break; } } A symbol with an out-of-bounds st_shndx value, for example 0xffff (known as SHN_XINDEX or SHN_HIRESERVE), may cause a kernel panic: BUG: unable to handle page fault for address: ... RIP: 0010:simplify_symbols+0x2b2/0x480 ... Kernel panic - not syncing: Fatal exception This can happen when module ELF is legitimately using SHN_XINDEX or when it is corrupted. Add a bounds check in simplify_symbols() to validate that st_shndx is within the valid range before using it. This issue was discovered due to a bug in llvm-objcopy, see relevant discussion for details [1]. [1] https://lore.kernel.org/linux-modules/20251224005752.201911-1-ihor.solodrai@linux.dev/

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/082f15d2887329e0f43fd3727e69365f5bfe5d2c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4bbdb0e48176fd281c2b9a211b110db6fd94e175	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d16f519b6eb1d071807e57efe0df2baa8d32ad6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ba6957c640f58dc8ef046981a045da43e47ea23	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ec2b22a58073f80739013588af448ff6e2ab906f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ef75dc1401d8e797ee51559a0dd0336c225e1776	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f9d69d5e7bde2295eb7488a56f094ac8f5383b92	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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}

CVE-2026-31521 (GCVE-0-2026-31521)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-23 15:18

Title

module: Fix kernel panic when a symbol st_shndx is out of bounds

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/5d16f519b6eb1d071…
	https://git.kernel.org/stable/c/4bbdb0e48176fd281…
	https://git.kernel.org/stable/c/082f15d2887329e0f…
	https://git.kernel.org/stable/c/ec2b22a58073f8073…
	https://git.kernel.org/stable/c/ef75dc1401d8e797e…
	https://git.kernel.org/stable/c/6ba6957c640f58dc8…
	https://git.kernel.org/stable/c/f9d69d5e7bde2295e…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d16f519b6eb1d071807e57efe0df2baa8d32ad6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4bbdb0e48176fd281c2b9a211b110db6fd94e175 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 082f15d2887329e0f43fd3727e69365f5bfe5d2c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ec2b22a58073f80739013588af448ff6e2ab906f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ef75dc1401d8e797ee51559a0dd0336c225e1776 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6ba6957c640f58dc8ef046981a045da43e47ea23 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f9d69d5e7bde2295eb7488a56f094ac8f5383b92 (git)

Linux

Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/ec2b22a58073f80739013588af448ff6e2ab906f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef75dc1401d8e797ee51559a0dd0336c225e1776"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ba6957c640f58dc8ef046981a045da43e47ea23"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9d69d5e7bde2295eb7488a56f094ac8f5383b92"
        }
      ],
      "title": "module: Fix kernel panic when a symbol st_shndx is out of bounds",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31521",
    "datePublished": "2026-04-22T13:54:36.211Z",
    "dateReserved": "2026-03-09T15:48:24.109Z",
    "dateUpdated": "2026-04-23T15:18:38.682Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-31521

CVE-2026-31521 (GCVE-0-2026-31521)

Tags

Sightings

Nomenclature