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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2026-64317

isofs: bound Rock Ridge symlink components to the SL record

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: isofs: bound Rock Ridge symlink components to the SL record get_symlink_chunk() and the SL handling in parse_rock_ridge_inode_internal() walk the variable-length components of a Rock Ridge "SL" (symbolic link) record. Each component is a two-byte header (flags, len) followed by len bytes of text, so it occupies slp->len + 2 bytes. Both loops read slp->len and advance to the next component, and get_symlink_chunk() additionally does memcpy(rpnt, slp->text, slp->len), but neither checks that the component lies within the SL record before dereferencing it. A crafted SL record whose component declares a len that runs past the record (rr->len) therefore triggers an out-of-bounds read of up to 255 bytes. When the record sits at the tail of its backing buffer - for example a small kmalloc()ed continuation block reached through a CE record - the read crosses the allocation; get_symlink_chunk() then copies the out-of-bounds bytes into the symlink body returned to user space by readlink(), disclosing adjacent kernel memory. ISO 9660 images are routinely mounted from untrusted removable media - desktop environments auto-mount them (e.g. via udisks2) without CAP_SYS_ADMIN - so the record contents are attacker-controlled. Reject any component that does not fit in the remaining record bytes before using it. In get_symlink_chunk() return NULL, like the existing output-buffer (plimit) checks, so a malformed record makes readlink() fail with -EIO rather than silently returning a truncated target; in parse_rock_ridge_inode_internal() stop the inode-size walk.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1015e1c4b2fadd9c09704e24738e46598778c869affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 36fe7d25dbc40da0c6b1dd4513a4f69ac6164eeeaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a22cb6bb54dc167047ea9e70d97dfbc2c15649e3affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b736b12108fd116c41777628f5a333791604df26affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6bf41db09ef935d76fcc84ccf213b42c18de95eeaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b5699642640d6cff357638738c5293985cd5a53daffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9830725078c8483c6831ec10222ae724806ea36baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5fa1d6a5ec2356d2107dead614437c66fa7138b1affected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.1.4 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References