Answer in brief
CVE-2026-22991 records a High severity (CVSS 7.5) vulnerability in libceph: make free_choose_arg_map() resilient to partial allocation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5cf9c4a9959b6273675310d14a834ef14fbca37c <9b3730dabcf3764bfe3ff07caf55e641a0b45234 || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <851241d3f78a5505224dc21c03d8692f530256b4 || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <ec1850f663da64842614c86b20fe734be070c2ba || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <8081faaf089db5280c3be820948469f7c58ef8dd || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <f21c3fdb96833aac2f533506899fe38c19cf49d5 || >=5cf9c4a9959b6273675310d14a834ef14fbca37c <e3fe30e57649c551757a02e1cad073c47e1e075e | 9b3730dabcf3764bfe3ff07caf55e641a0b45234, 851241d3f78a5505224dc21c03d8692f530256b4, ec1850f663da64842614c86b20fe734be070c2ba, 8081faaf089db5280c3be820948469f7c58ef8dd, c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf, f21c3fdb96833aac2f533506899fe38c19cf49d5, e3fe30e57649c551757a02e1cad073c47e1e075e |
| Linux/Linuxgeneric | 4.13 | Not reported |
Published upstream
Jan 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 19, 2026
In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation. For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer. To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.
Quoted source text, attributed separately from HOL analysis.