PT-2026-61345 · Linux · Linux

CVE-2026-64028 · Published 2026-07-19 · Updated 2026-07-19

Mitre

In the Linux kernel, the following vulnerability has been resolved:

tracing: Avoid NULL return from hist field name() on truncation

hist field name() returns "" everywhere except the fully-qualified VAR REF/EXPR case, where snprintf() truncation returns NULL early and bypasses the bottom NULL->"" guard. Callers don't expect NULL: strcat(expr, hist field name(field, 0)) at trace events hist.c:1758 and the strcmp() in the sort-key match loop at :4804 both deref it.

system and event name are bounded by MAX EVENT NAME LEN, but the field name on a VAR REF is kstrdup'd from a histogram variable name parsed out of the trigger string and has no length cap, so a long enough var name in a fully qualified reference can reach the truncation path.

Keep the length check but leave field name as "" on overflow.

Related Identifiers

CVE-2026-64028

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-64028 · Security Note
• https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91 · Note
• https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d · Note
• https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34 · Note
• https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728 · Note
• https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703 · Note
• https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea · Note
• https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec · Note
• https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353 · Note